Revo 3.3 Manual

MODEL 5309

owners manual

Thank you for choosing a Traxxas Revo. We believe you have

purchased the finest, most technologically advanced R/C monster

truck available. Revo proudly demonstrates Traxxas’ passionate

commitment innovation, ultimate performance, and unmatched

engineering. Revo’s radically advanced suspension, chassis, and

transmission design takes performance to a higher level. Now with

larger TRX 3.3 Racing Engine, Revo pushes the performance envelope

even further with relentless, over-the-top horsepower. We’ve

engineered the Revo to allow you to experience power, control, and

responsiveness that surpasses anything else you’ve driven.

The new TRX 3.3 Racing Engine is the most powerful engine of its size

ever available in a Ready-To-Run truck. Advanced engineering and

design, along with thousands of hours of testing, puts the TRX 3.3 in a

class by itself. Each part of the TRX 3.3 - from the air filter on the slide

carburetor, to the tip on the dyno-tuned exhaust system - has been

carefully engineered to provide maximum power over the broadest

rpm range.

Revo is equipped with the patent pending OptiDrive

™

electronic

transmission control. Advanced electronic reduce the number of

moving parts inside the transmission for less weight, smooth

engagement and efficient performance.

Traxxas was the first with standard on-board electric starting.

The EZ-Start has evolved into an incredibly advanced and reliable

starting solution, featuring thermal protection for the motor and

built-in diagnostics to monitor the condition of the glow plug.

We know you’re excited about getting your new Revo on the road,

but it’s very important that you take some time to read through the

Owners Manual. This manual contains all the necessary set-up, break-

in, tuning, and operating procedures that allow you to unlock the

incredible performance and adjustment potential that Traxxas

engineers designed into Revo.

Even if you are an experienced R/C

enthusiast, it’s important to read and follow the procedures in this

manual. Revo contains new technologies in the engine, suspension,

and transmission operation that you may not be familiar with. Pay

particular attention to the fuel and break-in requirements for the

engine. The advanced design of the TRX 3.3 Racing Engine has a

special break-in procedure that has been developed and proven to

produce the best-performing engine possible. Using traditional or

old-fashioned procedures could reduce engine performance and

longevity.

Revo is made to be a complete package that starts with the highest

level of engineering; a professionally produced DVD to acquaint you

with the starting, racing, and maintenance procedures; and is

equipped stock with the most powerful Ready-To-Race® engine

available. We want you to feel confident that you own the best-

performing truck in the market and that it is backed by a team of

professionals who aim to provide the highest level of factory support

possible. Revo is about experiencing total performance and

satisfaction, not just with your truck, but also with the company that

stands behind it.

Thank you again for going with Traxxas. We work hard every day

to assure you the highest level of customer satisfaction possible.

We truly want you to enjoy your new Revo!

•

Revo 3.3

Before You

Proceed

Safety

Precautions

Tools, Supplies

and Required

Equipment

Anatomy of

Your Revo

Quick Start:

Getting Up to

Speed

Gluing the Tires

and Decorating

Your Revo

The Traxxas

TQ-3 Radio

System

The TRX 3.3

Racing Engine

Driving

Your Revo

Basic Tuning

Adjustments

Maintaining

and Storing

Your Revo

Advanced Tuning

Adjustments

Index

Introduction

Traxxas Support

Traxxas support is with you every step of the way.

Refer to the next page to find out how to contact

us and what your support options are.

Quick Start

This manual is designed with a Quick Start path

that covers only the necessary procedures to get your model

up and running in the shortest time possible. If you are an

experienced R/C enthusiast you will find it helpful and fast.

Be sure and read through the rest of the manual to learn

about important safety, maintenance, and adjustment

procedures. Turn to page 7 to begin.

Revo 3.3

•

Carefully read and follow all instructions in this and any accompanying

materials to prevent serious damage to your Revo. Failure to follow

these instructions will be considered abuse and/or neglect.

Before running your Revo, look over this entire manual and examine the

truck carefully. If for some reason you decide Revo is not what you

wanted, then do not continue any further. Your hobby dealer absolutely

cannot accept a Revo for return or exchange after it has been run.

Warnings, helpful hints, & cross-references

Throughout this manual, you’ll notice warnings and helpful hints

identified by the icons below. Be sure to read them!

An important warning about personal safety or avoiding

damage to your Revo and related components.

Special advice from Traxxas to make things easier and more fun.

Refers you to a page with a related topic.

Support

If you have any questions about your Revo or its operation,

call the Traxxas Technical Support line toll-free at:

1-888-TRAXXAS (1-888-872-9927)

Technical support is available Monday through Friday from 8:30 am

to 9:00 pm central time. Technical assistance is also available at

www.Traxxas.com. You may also e-mail customer support with your

question at

[email protected]. Join hundreds of Traxxas R/C

enthusiasts in our online community at Traxxas.com.

Traxxas offers a full-service, on-site repair facility to handle any of

your Traxxas service needs. Maintenance and replacement parts

may be purchased directly from Traxxas by phone or online at

www.BuyTraxxas.com. You can save time, along with shipping and

handling costs, by purchasing replacement parts from your local dealer.

Traxxas

1100 Klein Road

Plano, Texas 75074

Phone: 972-265-8000

Toll-free 1-888-TRAXXAS

Traxxas U.K.

P.O. Box 1128

Winterbourne, Bristol BS36-2SH

England

Phone: 44-117-956-1002

Internet

www.Traxxas.com

E-mail: [email protected]

Traxxas, Revo, TRX 3.3 Racing

Engine, TQ-3, Top Fuel,

EZ-Start, Ready-To-Race, Ready-

To-Win, and ProGraphix are

trademarks or registered

trademarks of Traxxas. Other

brand names and marks are the

property of their respective

holders and are used only for

purposes of identification. No

part of this manual may be

reproduced or distributed in

print or electronic media without

the express written permission

of Traxxas.

Before You Proceed

*Toll-free support is available to U.S. residents only.

All of us at Traxxas want you to safely enjoy your new Revo. Operate

your Revo sensibly and with care, and it will be exciting, safe, and fun for

you and those around you. Failure to operate your Revo in a safe and

responsible manner may result in property damage and serious injury.

The precautions outlined in this manual should be strictly followed to

help ensure safe operation. You alone must see that the instructions are

followed and the precautions are adhered to.

Important Points to Remember

Revo is very fast! The Revo is intended for experienced users with a

high level of skill. The TRX 3.3 Racing Engine is extremely powerful

and may require skilled driving to maintain control. Children under 16

years of age and inexperienced drivers should not operate the Revo

without the supervision of a responsible and knowledgeable

(experienced) adult.

Model engine fuel is dangerous and highly poisonous. Always

follow all directions and precautions printed on the fuel container.

Model engine fuel is poisonous to humans and animals. Drinking the

fuel can cause blindness and death. Handle with care and respect.

Model engine fuel, especially when in a fuel dispensing bottle, may

look like a cool drink to a child.

Keep all fuel out of the reach of

children at all times. Do not place fuel containers on the ground

where children can reach them while you are driving.

Model engine fuel is flammable. Never allow smoking, sparks,

heat or flame in the presence of fuel or fuel vapors.

The engine, brakes, and exhaust system may become extremely hot

during use. Be careful not to touch the parts, especially when

refueling or stopping the engine.

Prolonged exposure to the engine exhaust can be harmful. Avoid

breathing the engine exhaust. Always run your Revo outdoors,

in a well-ventilated area. Never run the engine indoors.

Do not operate your Revo at night, or anytime your line of sight to the

model may be obstructed or impaired in any way.

Never operate your Revo in crowds of people or busy pedestrian

areas. Revo is very fast and could cause injury to those unaware of its

presence. Keep small children at a safe distance away from the

operating area.

Because Revo is controlled by radio, it is subject to radio interference

from many sources beyond your control. Since radio interference can

cause momentary loss of control, always allow a safety margin in all

directions around your model to prevent collisions.

The engine can be loud. If the noise makes you uncomfortable, wear

ear protection. Be considerate of your neighbors by not running your

model early in the morning or late in the evening.

Most importantly, use good common sense at all times.

•

Revo 3.3

Safety Precautions

All instructions and

precautions outlined in this

manual should be strictly

followed to ensure safe

operation of your Revo.

Revo is not intended for use

by children under 16 years

of age without the

supervision of a responsible

and knowledgeable adult.

Revo 3.3

•

Your Revo comes with a set of specialty metric tools. You’ll need to purchase other items, available from your hobby dealer, to operate and maintain your model.

Tools, Supplies, and Required Equipment

Supplied Tools and Equipment

TRX Power Charger

RX battery power pack

(installed in model)

TRX Power plug

(transformer)

8 AA alkaline batteries

(see page 23)

Hobby knife

Traxxas Top Fuel

™

see page22

Small flat-blade screwdriver

for tuning (1/8 inch blade)

After-run oil to protect

the engine from corrosion

10% quart - #5010

20% quart - #5020

33% quart - #5030

10% gallon - #5060

20% gallon - #5070

33% gallon - #5080

For more information on

radio system batteries, see

Use the Right Batteries on

page 11.

The TRX Power Charger

included with your Revo

has the ability to charge

the RX Power Pack (receiver

pack, included) and the 7.2-

volt battery pack required

for the EZ-Start (sold

separately). For more

information about

chargers, see

Use the Right

Charger

on page 26.

NiCad or NiMH

7.2V battery pack

Philips screwdriver

TRAXXAS

Suspension multi-tool

Glow plug and

wheel nut wrench

1.5mm “L” wrench 2.0mm “T” wrench 2.5mm “T” wrench

8mm slipper clutch wrenchShock wrench 5mm turnbuckle wrench 4-way wrench

Suspension tuning

shims and hollow balls

Long Travel rocker and spring set

Required Tools and Equipment

2.5mm “L” wrench

TRAXXAS

Recommended Equipment

These items are not

required for the operation

of your model, but are a

good idea to include in any

R/C toolbox:

• Safety glasses

• Thin, hobby-quality

cyanoacrylate instant tire

glue (CA glue)

• Side cutters or needle

nose pliers

Foam air filter oil and

extra oiled air filter element

7.2-volt battery

pack adapter

Fuel dispensing bottle

(Traxxas part #5001)

•

Revo 3.3

Anatomy of Your Revo

Fuel Tank

Fuel Cap

Steering Servo

Shifting Servo

(inside box)

Suspension Arm

Bumper

Bumper Mount

Skid Plate

Oil Shock (Damper)

Differential

(under chassis)

Toe Link (Turnbuckle)

Throttle/Brake

Servo

(inside box)

Transmission

Air Filter

Tuned Pipe

Exhaust Header

TRX 3.3 Racing Engine

see pg. 19 for details

Pressure Line

Fuel Line

EZ-Start Motor

EZ-Start Plug

Bulkhead

(under chassis)

Body Mount Post

Spur

Gear

Chassis

Slipper

Clutch

Driveshaft (Half Shaft)

On/Off Switch

Shift Rod

Antenna Mount

Access Plug

(for two-speed adjustment)

5-cell RX Power Pack

(inside box)

Pipe Hanger

Receiver Box

OptiDrive

™

Electronic

Shift Module

Engine Shut-off Clamp

Roll hoop

Rocker

Push Rod

Pivot Ball

Hex Hub

Axle Carrier

Spring Pre-load Adjuster

Steering Servo

Disc Brake

Brake Tension

Adjuster

Charging Jack

(underneath)

Fuel Cap

Handle

Revo 3.3

•

Quick Start: Getting up to Speed

The following guide is an overview of the procedures for getting your Revo running, from opening the box to breaking in and tuning your engine.

Refer to the pages indicated for details on each step. Look for the Quick Start logo on the bottom corners of Quick Start pages.

1. Read the safety precautions on page 4

For your own safety, understand where carelessness and misuse

could lead to personal injury.

2. Charge the EZ-Start battery pack • See page 26

The EZ-Start requires a fully charged 7.2-volt battery

pack (sold separately).

3. Charge the RX Power Pack • See page 12

The 5-cell receiver battery is already installed in the truck. Plug the

supplied charger into the charging jack on the truck.

4. Install the antenna • See page 13.

Install the antenna mast in Revo.

5. Decal and Install the body • See page 8

You will need to use the body during break in, so it's best to apply

any additional decals before you use the body.

6. Install batteries in the transmitter • See page 11

Revo requires 8 AA alkaline or rechargeable batteries

for the transmitter.

7. Install the EZ-Start battery • See page 26

Install and connect a charged 7.2-volt battery pack in

the EZ-Start controller.

8. Turn on the radio system • See page 16

Make a habit of turning the transmitter on first, and off last.

9. Check servo operation • See page 17

Make sure the throttle, shifting, and steering servos are working

correctly.

10. Range test the radio system • See page 17

Follow this procedure to make sure your radio system works properly

at a distance and that there is no interference from outside sources.

11. Fill the fuel tank • See page 23

Use your fuel-dispensing bottle to fill the tank.

12. Connect the EZ-Start to the model • See page 27

Learn the proper way to use the EZ-Start electric starting system

13. Start the engine • See page 28

Learn to use the correct starting procedure for your TRX 3.3.

14. Break-in your engine • See page 28

Follow the break-in instructions exactly to ensure the

best-performing, longest-lasting engine.

15. Tune your engine • See page 30

Learn how to set the fuel mixture needles for optimum

engine performance.

16. Drive your Revo • See page 33

Learn to use the two-speed and reverse function on your truck,

along with important driving precautions.

17. Maintaining your Truck • See pages 40-41

Follow these critical steps to maintain the performance of your

Revo and keep it in excellent running condition.

The Quick Start Guide is

not intended to replace

the full operating

instructions available in

this manual. Please read

this entire manual for

complete instructions

on the proper use and

maintenance of

your Revo.

The included TRX Power

Charger can charge both

the RX Power Pack

(receiver battery) and the

7.2-volt battery pack for

the EZ-Start.

Look for the Quick Start

logo at the bottom of

Quick Start pages.

Applying The Decals

The main decals have already been

applied to your Revo. The extra decals

provided are die-cut for easy removal.

Use a hobby knife to lift the corner

of a decal and remove it from

the backing.

Carefully position the decal over the

desired location and press one side on

the body. Pull the decal tight and use

a finger to gradually smooth out any

air bubbles as you apply the decal.

Look at the photos on the box for

typical decal placement.

Tire Gluing

The factory tires on your Revo are already glued to the rims. The tires

must be glued to the rims to prevent the rims from spinning inside the

tires. The instructions here are provided to show you how to glue

replacement tires to the rims in the future. Use CA tire glue available

from your local hobby dealer. You can glue the tires without removing

the wheels from the truck. For clarity, these instructions show the

process with the wheels removed.

•

Revo 3.3

Gluing the Tires and Decorating your Revo

1. Remove a wheel from Revo

using the larger (8mm) end of

the glow plug (universal)

wrench.

2. Use your thumb to push the side

of the tire away from the rim.

Place one or two drops of CA

glue into the opening and

release the tire. Capillary action

will draw the glue around the

bead of the tire.

3. Repeat step two at four or five

points around the rim, until the

tire is completely secured to the

rim. Turn the rim over and repeat

the process for the inside of the

rim/tire. Repeat for the other 3

wheels.

4. Reinstall the wheels, make sure

none of the axle pins have fallen

out from behind the hex hubs.

Always wear safety glasses

to prevent glue from

splattering into your eyes.

The acetone in fingernail

polish remover will

remove excess glue from

your fingers.

For best results while

gluing, clean the bead of

the tires and the grooves

of the wheels with

denatured alcohol before

applying glue. This

removes any mold release

agent residue from the

tires and wheels,

providing a better bond.

CH.3

CH.2

CH.1

Revo 3.3

•

The Traxxas TQ-3 Radio System

Your Revo is equipped with the TQ-3 radio system. The TQ-3 is a 3-channel system that provides up to a quarter mile range and control for up to three

servo outputs. Revo is equipped with two high-torque steering servos connected via a “Y” plug adapter (one input, two equal outputs). The TQ-3 works

in conjunction with the OptiDrive

™

Electronic Shift Module to monitor and control the input and output signals for the throttle and shifting servos

(channels). The OptiDrive monitors the voltage of the on-board RX Power Pack. The "Function" LED will flash red if the battery voltage is too low.

Antenna

Throttle Neutral Adjust

Steering Wheel

Throttle Trim

Steering Trim

Reverse Shift

Forward Shift

Power Switch Power IndicatorBattery

Compartment

Servo Reversing

Switch

Throttle

Trigger

Revo Wiring Diagram

Antenna

On/Off

Switch

Receiver

RX Power Pack

5-cell NiMH

Battery

Steering Servos

Throttle Servo

Shifting Servo

(micro servo)

The OptiDrive ESM is

designed to adapt and

work with aftermarket

three channel radio

systems (see page 15).

OptiDrive ESM

(Electronic Shift

Module)

Battery

Channel 1

Charging Jack

(to charger)

Channel 2

Channel 3

TQ-3 Transmitter

To Transmission

(OptiDrive sensor)

•

Revo 3.3

Radio System Terminology

Please take a moment to familiarize yourself with these radio-system

terms. They will be used throughout this manual.

5-Cell Pack – Another term for RX Pack or rechargeable receiver pack.

The RX pack is made up of five rechargeable NiMH battery cells and is

used in place of the 4AA batteries in the model.

Channel - The 27 MHz frequency band is divided into 6 channels so that

up to six models can be operated simultaneously. Each channel is

referred to by its flag color and channel number, as shown below.

Clearing your frequency - A routine, verbal check to make sure

nobody else in your area is operating on the same channel. Always

clear your frequency by calling out your channel number before

operating your model. Wait or move to another area if your channel

is already being used.

Crystal (X-tal) - The plug-in device that determines which channel the

radio system will operate on. For each channel, there are two crystals,

one for the receiver and one for the transmitter. Of those two crystals,

the one marked “RX” with the lower number (.455 MHz lower) must be

inserted into the receiver.

Frequency band - The radio frequency used by the transmitter to send

signals to your Revo. All Traxxas RTR models operate on a 27 MHz

frequency band.

mAh – Abbreviation for milliamp hour. Measure of the capacity of the

battery pack. The higher the number, the longer the battery will last

between recharges.

Neutral position - The standing position that the servos seek when the

transmitter controls are at the neutral setting.

NiCad - Abbreviation for nickel-cadmium. The original rechargeable

hobby pack, NiCad batteries have very high current handling, high

capacity, and can last up to 1000 charging cycles. Good charging

procedures are required to reduce the possibility of developing a

“memory” effect and shortened run times.

NiMH - Abbreviation for nickel-metal hydride. Rechargeable NiMH

batteries offer high current handling, and much greater resistance

to the “memory” effect. NiMH batteries generally allow higher

capacity than NiCad batteries. They can last up to 500 charge

cycles. A peak charger designed for NiMH batteries is required

for optimal performance.

OptiDrive ESM – Electronic Shift Module. The onboard electronic

controller that monitors vehicle speed and throttle position in order to

control the action of the shifting servo. Also includes low battery

indicator for the onboard receiver pack (RX Power Pack).

Receiver - The radio unit inside your Revo that receives signals from the

transmitter and relays them to the servos.

RX Pack - RX is a common abbreviation for the radio receiver and items

associated with it. RX Pack denotes the optional rechargeable battery

pack used to power the radio system in the model. It is available as

Traxxas part number 3037.

Servos - Small motor units in your Revo that operate the throttle and

steering mechanisms.

Three-channel radio system - The TQ-3 radio system, consisting of the

receiver, the transmitter, and the servos. The system uses three

channels: one to operate the throttle, one to shift the transmission,

and one to operate the steering.

Transmitter - The hand-held radio unit that sends throttle and steering

instructions to your Revo.

Trim - The fine-tuning adjustment of the neutral position of the servos,

made by turning the throttle and steering trim knobs on the face of

the transmitter.

Y Adapter – Servo cable adapter that takes one input signal and directs

it to two equal output signals. Used to connect dual steering servos to

the channel one receiver output.

The Traxxas TQ-3 Radio System

Channel

Frequency

Band

Flag

Color

Traxxas

Part No.

1 26.995 Brown 2031

2 27.045 Red 2032

3 27.095 Orange 2033

4 27.145 Yellow 2034

5 27.195 Green 2035

6 27.255 Blue 2036

Learn terms related to the

TRX 3.3 Racing Engine

beginning on page 20.

Installing Transmitter Batteries

Your TQ-3 transmitter uses 8 AA batteries. The battery compartment is

located in the base of the transmitter.

1. Remove the battery compartment door by pressing the tab and

lifting the door up.

2. Install the batteries in the correct orientation as indicated in the

battery compartment.

3. Reinstall the battery door and snap it closed.

4. Turn on the transmitter and check the power indicator for a

solid red light.

If the power indicator light flashes, then the transmitter batteries are

weak, discharged or possibly installed incorrectly. Replace with new or

freshly charged batteries. The power indicator light does not indicate

the charge level of the RX Power Pack installed in the model.

Revo 3.3

•

The Traxxas TQ-3 Radio System

CH.3

CH.2

CH.1

Use the Right Batteries

Your transmitter uses AA

batteries. Use new alkaline

batteries, or rechargeable

batteries such as NiCad or

NiMH (Nickel Metal Hydride)

batteries in your

transmitter. Make sure

rechargeable batteries are

fully charged according to

the manufacturer’s

instructions.

If you use rechargeable

batteries in your

transmitter, be aware

that when they begin

to lose their charge, they

lose power much more

quickly than regular alkaline

batteries.

Caution: Discontinue

running your Revo at the

first sign of weak batteries

(flashing red light) to avoid

losing control.

If the power indicator

doesn’t light red, check the

polarity of the batteries.

Check rechargeable

batteries for a full charge.

Charging the Receiver Batteries

To power the radio system

in the truck, your Revo is

equipped with the RX

Power Pack, a rechargeable

5-cell nickel metal hydride

(NiMH) battery pack. The RX

Power Pack must be fully

charged before running the

truck. The supplied TRX

Power Charger is a peak-

detecting unit that will

charge the supplied RX

Power Pack in about one

hour. The peak-detection

circuitry automatically shuts off the charger when the maximum charge

has been achieved. Revo has a built in charging jack so you do not have

to remove the battery pack from the model. The long charger cord

allows easy handling of the truck while the battery is charging.

1. The TRX Power Charger can operate on either AC or DC power*.

An AC power supply is supplied with the charger. Plug the end of the

AC power supply into the back of the charger.

2. Plug the AC power supply into any 110-volt (U.S. models) wall outlet.

The charger light should glow steady green (no battery connected).

3. Plug the charger output cord into the charging jack located under the

right front of the truck. The charging jack is

protected by a rubber plug.

4. The green light on the charger should begin

to flash quickly, indicating that fast charging

is in progress.

5. When the light turns solid green (not

flashing), the battery pack is fully charged

and ready for use.

6. Put the rubber plug back over the charging

jack on the truck.

After fast charging has completed, the TRX Power Charger continues to

charge in trickle (slow) charge mode. It will continue until the battery is

disconnected. The TRX Power Charger will automatically shut off after 90

minutes of fast charging time. When the

charger is not in use, wind the charging

cord around the cord holder. To secure

the cord, insert the end of it into the

retaining slot on either end of the cord

holder. The TRX Power Charger is designed

to be conveniently mounted to a wall or

other vertical surface using the supplied

#8 x 1" wood screws.

The TRX Power Charger can be powered by

our optional DC car adapter (sold separately).

It features a tangle-free, extra-long wire and

integrated fuse. The long charging cord allows

the model to remain outside the car while

charging.

Caution! Never charge batteries in an

enclosed car interior or while driving. Never

leave charging batteries unattended. Monitor

them closely.

Battery Care

Some precautions should be taken to maintain the performance of the

rechargeable NiMH receiver pack in your model. Improper use of the

battery pack could result in personal injury or damage to your truck.

Only use approved chargers for NiMH battery packs (such as the Traxxas

TRX Power Charger). Do not exceed the maximum charge rate of 1 amp.

Do not short-circuit the battery pack. This may cause burns and severe

damage to the battery pack

Do not burn or puncture the batteries. Toxic materials could be released.

If eye or skin contact occurs, flush with water.

Store the battery pack in a dry location, away from heat sources

and direct sunlight.

Nickel Metal Hydride batteries must be recycled or disposed of properly.

Do not completely discharge the RX Power Pack or you could damage

it. Do not use dischargers on the pack. Store the battery with at

least 25% charge. Stop running and recharge at the first indication

of reduced voltage.

After connecting a fully-drained battery to the charger it may take up to

15 seconds for the charger to sense the battery and begin to charge. To

start charging immediately, plug the battery pack into the charger and

then plug the charger into the wall socket.

•

Revo 3.3

The Traxxas TQ-3 Radio System

* With optional DC car adapter

Part #3032

To prevent losing control of

your model, it is important to

stop at the first sign of weak

receiver battery. Visible

warning signals include

sluggish steering response

and shortened radio range.

In addition, the OptiDrive is

equipped with a low-voltage

indicator and a failsafe circuit.

When the voltage of the

receiver battery drops below

4.3 volts, the “Function” LED

on the OptiDrive will flash red.

If the voltage drops below 4.3

volts for more than 2 seconds,

the OptiDrive ignores throttle

and shift signals and applies

25% brakes (failsafe mode).

Steering will still be

operational and the

“Function” LED on the

OptiDrive will flash red. The

OptiDrive will stay in failsafe

mode until the power is

turned off or the receiver

battery voltage rises above

4.3 volts for more than 2

seconds. Anytime the

“Function” LED flashes red, it

is time to stop and recharge

your battery pack . Do not try

to continue running your

model with weak receiver

batteries on board.

Setting up the Antenna

1. Locate the black antenna wire that exits the receiver cover. The

receiver cover is mounted on the top of the chassis, near the front.

The antenna wire exits the cover just ahead of the fuel tank.

2. Pull the wire straight with your fingers and then insert the end of

the wire into one end of the antenna tube. Push the wire all the

way through the antenna tube.

3. Insert the base of the tube into the molded post on the side of the

radio box.

4. Place the antenna tip over the top of the tube to secure the

antenna wire.

5. On the transmitter, always fully extend the telescoping antenna

when running your Revo. Make a habit of holding the transmitter

so that the antenna points straight up.

Revo 3.3

•

TRX Charger Specifications:

Input voltage:

10.6/16v (min/max)

Fast charge current:

750/1000mA (min/max)

Slow (trickle) charge current:

22/55mA (min/max)

Delta Peak:

10mv

Maximum charge time:

90 minutes

The Traxxas TQ-3 Radio System

Spray a little window

cleaner on the antenna

wire to make it easier

to push through the

antenna tube.

Don’t shorten the length

of the antenna wire. Its

length is tuned to the

frequency band; cutting it

could severely shorten the

radio system’s range.

Don’t push the

transmitter antenna down

from the top. Pull it down

from the bottom, one

segment at a time, to

prevent binding and

kinking the antenna mast.

Antenna Tip

Antenna Tube

Front of

Truck

•

Revo 3.3

Steering

Brake

Neutral

Accelerate

CH.

Shift Reverse

Shift Forward

TQ-3 Radio System Controls

The Traxxas TQ-3 Radio System

TQ-3 Radio System Adjustments

In addition to the electronic throttle and steering trim controls, your

radio system features throttle neutral adjustment and servo reversing

switches.

Throttle Neutral Adjustment

The throttle neutral adjustment is located on the transmitter face and

controls the forward/reverse travel of the throttle trigger. Change the

adjustment by pressing the button and sliding it to the desired position.

There are two settings available:

50/50: Allows equal travel for both acceleration and braking.

70/30: Allows more throttle travel (70%) and less

brake travel (30%).

50/50 is the required setting for Revo with the TRX 3.3 Racing Engine.

Electronic Throttle Trim

The electronic throttle trim located on the face of the transmitter adjusts

the neutral (center) point of the throttle servo when the servo is at rest.

This control has been preset for you at the factory. If necessary, adjust

the control so that the carburetor is at idle, and the brakes are not

applied (the model will roll freely). Do not use the throttle trim to raise

or lower the engine idle speed. Make the idle speed adjustment on the

carburetor.

Electronic Steering Trim

The electronic steering trim located on the face of the transmitter

adjusts the neutral (center) point of the steering servos when the servos

are at rest. Adjust this control to make the model drive straight with no

steering input at the wheel.

Revo 3.3

•

Servo Reversing Switches

The servo reversing switches are located on the front of the transmitter,

next to the on/off switch. Moving a switch reverses the direction of the

corresponding servo. Each switch corresponds to a channel, as shown

below. For example, if you turn the steering wheel to the right and your

front wheels turn left, you would move the channel 1 switch to correct

the servo direction. It may be necessary to adjust the corresponding trim

control after

moving a switch

The default

position for the

servo reversing

switches is

shown.

Programming the OptiDrive

™

ESM

The OptiDrive ESM electronically monitors

vehicle speed and controls forward and reverse

shifting. Controlling the shift action electronically

rather than by mechanical systems reduces the

number of components in the transmission. The

transmission weighs less, there is lower

rotational mass for quicker acceleration, and

constant drive engagement for smooth power delivery.

The OptiDrive module prevents the transmission from changing

directions while the truck is in motion. The truck must be completely

stopped to change directions, regardless of the position of the shift

selector switch on the transmitter. The OptiDrive module is preset at the

factory. If the transmitter throttle trim adjustment is changed, then the

OptiDrive module will need to be re-programmed.

1. The engine must be shut off. The radio system must be on (receiver

and transmitter).

2. Set the TQ-3 Transmitter to its factory default shift settings:

Set the THROTTLE NEUTRAL switch to the 50/50 setting.

Set the THROTTLE TRIM to the center “0” setting, then adjust the

THROTTLE TRIM until the carburetor closes.

Set the CHANNEL 2 SERVO REVERSING SWITCH to the right position.

Set the CHANNEL 3 SERVO REVERSING SWITCH to the right position.

DO NOT change the position of any of the servo reversing switches

after programming the OptiDrive. If settings were changed after

programming the OptiDrive, it will have to be reprogrammed.

3. With the throttle at neutral, press and hold the

SET button until the Function LED flashes green

twice and then release the button immediately.

You are now in programming mode.

4. Pull the transmitter throttle

trigger to the full throttle

position. Hold it there until the

Function LED flashes green

three times.

Note: The throttle

servo will not move during programming even though it is connected

to the controller.

5. Release the transmitter throttle

trigger allowing it to return to

neutral. The Function LED will

turn solid green, indicating that

the shifting servo is OK to shift

and the programming has been completed. The controller is now

programmed and ready to go!

If the transmitter throttle settings are changed, it will be necessary

to complete the programming sequence again.

If the SET button is released before the Function LED flashes

green twice in step 3, the OptiDrive will return to the normal

operation mode.

If you experience any problems during programming, turn the

receiver off, then on again, and repeat the programming steps.

For instructions on how to use the OptiDrive with aftermarket radio

systems, or to access advanced programming options, visit our website,

www.Traxxas.com.

CH.3

CH.2

CH.1

Channel Servo

1 Steering

2 Throttle and braking

3 Shifting

The Traxxas TQ-3 Radio System

TQ-3 Channel to Servo Chart

Large adjustments to the

throttle trim and/or throttle

linkage may require re-setting

the OptiDrive to maintain

proper shifting action.

For transmission durability,

the OptiDrive ESM limits the

model’s reverse speed to about

70% of full throttle. If settings

are changed, and you notice a

decrease in forward top speed,

you could have the OptiDrive

system reversed. Return the

TQ-3 servo-reversing switches

for channels two and three

back to their default settings

and re-program the OptiDrive

Module. For programming with

aftermarket radio systems,

please see our website.

• Green “Function”

Shift allowed

•

Red flashing “Function”

Low battery, see pg. 12

•

Red “Sensor”

a) Sensor, throttle or shift

circuit is broken. Possible

disconnected or broken sensor,

throttle or shift wires. Possible

damaged sensor.

b) Receiver has lost signal from the

transmitter, the OptiDrive has

entered fail-safe (throttle and shift

servos become unresponsive).

•

Blue flashing “Sensor“

Normal operation as

vehicle moves. Indicates

signal pulse from sensor. Depending

on the rotor position, solid blue or off

when vehicle is at rest.

OptiDrive Operation

•

Revo 3.3

TQ-3 Radio System Rules

Each time you prepare to run your Revo,

you must clear your frequency to be sure

no one else in the area is using the same

channel as you.

There are six possible channels, numbered

1 through 6. Each is represented by a color.

Look at the crystal plugged into the back of

your transmitter to determine which

channel your truck is assigned to.

Always turn your TQ-3 transmitter on first

and off last. This procedure will help to prevent your Revo from

receiving stray signals from another transmitter, or other source,

and running out of control.

Always have the transmitter and receiver turned on before you start

the engine. Never turn the radio system off while the engine is

running. The on/off switch in the model only turns the receiver on

and off. It does not turn off the engine.

Always use new or freshly charged batteries for the transmitter, and

make sure the on-board 5-cell NiMH battery pack is fully charged.

The function light on the OptiDrive will flash red if the 5-cell battery

pack requires charging. Weak batteries will limit the range of the

radio signal between the receiver and the transmitter. Loss of the

radio signal can cause you to lose control of your Revo.

Channel 1

Brown

Channel 2

Red

Channel 3

Orange

Channel 4

Yellow

Channel 5

Green

Channel 6

Blue

CH.3

CH.2

CH.1

Always turn your transmitter on first.

Always turn your receiver on second.

Then start your engine.

2 3

Remember, always turn the

TQ-3 transmitter on first and

off last to avoid damage to

your Revo. Never turn the

radio off while the engine is

running.

The Traxxas TQ-3 Radio System

Using the TQ-3 Radio System

The TQ-3 Radio System was pre-adjusted at the factory. The adjustment

should be checked before running the model, in case of movement

during shipping. Here’s how:

1. Fully extend the chrome antenna mast on the transmitter and turn

the switch on. The red indicator light on the transmitter should be

solid red (not flashing).

2. Turn on the receiver switch in the model. The switch is located in the

top of the radio compartment. The function light on the OptiDrive

ESM should be green. A red flashing LED indicates low voltage in the

RX Power Pack. The sensor LED is intermittent depending on the

rotor position.

3. Position Revo so that its front wheels are off the ground.

4. Turn the steering wheel on the transmitter back and forth and check

for rapid operation of the steering servo. Also, check that the steering

mechanism is not loose or binding. If the steering operates slowly,

then check the receiver pack to make sure it is fully charged.

5. When looking down at model, the front wheels should be pointing

straight ahead. If the wheels are turned slightly to the left or right,

slowly adjust the steering trim control on the transmitter until they

are pointing straight ahead.

6. Operate the throttle trigger on the transmitter and check for rapid

operation of the throttle servo. When the throttle trigger is pulled

back, the carburetor should open (slide moves out). When the

throttle trigger is pushed all the way forward, the brake should lock.

7. Operate the shift button on the transmitter and check for rapid

operation of the shifting servo. Push the shift button down for

forward. The servo will operate the spring-loaded shift mechanism

and you will hear the transmission click into forward. Push the shift

button up for reverse and you will again hear the transmission click

and shift into gear.

8. Once adjustments are made, turn off the receiver on your Revo,

followed by the hand-held transmitter.

Range-Testing the TQ-3 Radio System

Before each running session with your Revo, you should range-test your

radio system to ensure that it operates properly.

1. Turn on the radio system and check its operation as described in the

previous section (Using the TQ-3 Radio System).

2. Have a friend hold the model with the engine off.

3. Make sure your transmitter antenna is fully extended, and then walk

away from the model with the transmitter until you reach the farthest

distance you plan to operate the model.

4. Operate the controls on the transmitter once again to be sure that

the model responds correctly.

5. Do not attempt to operate the model if there is any problem with the

radio system or any external interference with your radio signal at

your location.

Revo 3.3

•

The Traxxas TQ-3 Radio System

When the engine is running,

don’t use the throttle trim on

the transmitter to adjust the

engine idle speed. Instead,

use the idle speed adjustment

on the carburetor.

Don’t attempt to operate

your Revo if there are any

problems with your radio

system or radio interference

at your location.

•

Revo 3.3

Traxxas strongly

discourages changing or

modifying any part of the

TRX 3.3 Racing Engine. Old

tech tips and tricks that

may have boosted the

power of other engines

could seriously diminish

the performance of the

TRX 3.3 Racing Engine.

There’s more advanced

thinking, development and

testing in the stock parts of

your TRX 3.3 Racing Engine

than in many aftermarket

manufacturer’s

performance parts. The

TRX 3.3 Racing Engine is

already the most powerful

engine in its class and may

not benefit from average,

low-tech, aftermarket bolt

on performance items.

Introduction

The TRX 3.3 Racing Engine is the next generation of TRX nitro power.

The larger displacement and advanced porting generate class-leading

horsepower while still maintaining the TRX Racing Engine characteristics of

broad, linear power delivery and ease of tuning. Focused engineering and

rigorous testing have yielded unprecedented power and uncompromising

performance that turns ready-to-run into Ready-To-Race®.

The TRX 3.3 Racing Engine takes a total-system approach. Each part of

the engine, from the air filter to the exhaust tip, is carefully engineered

to work in harmony with other engine components. Each part

complements the next, to extract maximum power. The TRX 3.3 Racing

Engine is designed to be tolerant of variations in tuning, and to run

successfully through a wide range of variable atmospheric conditions

such as changes in temperature, humidity, and altitude.

In order to get the longest engine life and keep the TRX 3.3 Racing

Engine in top running condition, it is very important to perform regular

routine maintenance.

The number one cause of premature engine

wear and failure is lack of care and maintenance!

Break-In

The TRX 3.3 Racing Engine is manufactured to exacting tolerances and

requires a specially-designed break-in procedure to accomplish the final

precision fitting of the internal engine components. It is very important

that you follow the new break-in procedure as closely as possible to

achieve the best performance and longest life from your TRX 3.3 Racing

Engine. Engine break-in will take between one and two hours. Old style

break-in procedures, such as idling the engine on the bench for several

tanks of fuel or simply running the engine with a very rich fuel mixture

for the first 4 tanks of fuel, will not achieve the best results. Follow the

easy steps in this manual.

Air Filter Maintenance

A clean air filter is critical for long engine life. Due to the high-

performance nature of the TRX 3.3 Racing Engine, a tremendous amount

of vacuum is created to move a large volume of high-velocity air through

the carburetor. Dirt is the worst enemy to your engine. Clean the air filter

after each hour of running to prevent sucking dirt into the engine. An

extra pre-lubed air filter element has been provided to encourage you to

maintain your air filter.

After-Run Maintenance

Perform after-run maintenance on the engine to prevent corrosion

from building up on the internal engine components. The fuel

naturally attracts moisture and corrosion can build up very quickly

inside the engine if it is not prevented.

A few minutes spent before and after each time you run your model

will allow you to enjoy it for a long time to come. Read on for more

exciting details about your new engine.

The TRX 3.3 Racing Engine

™

Revo 3.3

•

TRX 3.3 Racing Engine Illustrated

Air Filter

Base

Head Protector

PowerTune

™

head

(Cylinder head)

EZ-Start Drive Unit

EZ-Start Motor

Engine Mount

Low-Speed Needle

Throttle Arm

Clutch Bell

Flywheel

Carburetor

Air Intake

Fuel Intake

High-Speed

Needle

Idle Speed

Screw

EZ-Start Plug

Positive Wire

Negative Wire

Fuel Line

Fuel Tank

Tuned Pipe

Header

Pressure

Line

Ground Wire

Glow Plug Wire

EZ-Start

Controller

Crankshaft

Crankcase

Engine

Shut-off Clamp

Air Filter

Housing

Revo’s fuel tank is equipped

with a built-in sintered

bronze fuel filter.

•

Revo 3.3

Terms to Know

You’ll find these Nitro R/C engine terms throughout this section

of the manual.

.15 - .15 or “15” refers to the displacement of the engine. The TRX 2.5

Racing Engine is .15 cubic inches or 2.5 cubic centimeters (cc). The name

“TRX 2.5” is derived from the cc measurement.

.20 - .20 or “20” refers to the size of the engine. The TRX 3.3 is .20 cubic

inches or 3.3 cubic centimeters (cc). The name “TRX 3.3” is derived from

the cc measurement.

ABC - Abbreviation for aluminum, brass, and chrome. Refers to engine

construction that consists of an aluminum piston that slides in a chrome-

plated brass sleeve. The TRX 3.3 uses ABC construction.

Air filter - The air filter sits atop the carburetor and prevents harmful dust

and dirt from entering the engine. Dirt ingestion is the number one

cause of premature engine failure so the engine should never be run

without the air filter in place.

BDC - Bottom dead center. The bottom-most position of the engine

piston stroke.

Break-in - Break-in is the procedure for running a brand new engine

according to specific instructions. This correctly prepares the engine for

normal running. The break-in procedure can be different for different

makes of engines. Follow the Traxxas directions for break-in exactly.

Carb - Abbreviation for carburetor.

Carburetor - The carburetor atomizes (mixes) the fuel with the air so that

the engine can burn it. There are two types of carburetors; slide carbs

and barrel carbs. The TRX 3.3 uses the superior slide carburetor design.

Clean-out - Cleaning-out is a condition that occurs when the engine is

accelerating and the fuel mixture becomes sufficiently lean to allow the

engine to continue into its upper rpm power band. It is usually

characterized by a noticeable decrease in blue exhaust smoke and a

dramatic increase in engine speed.

Combustion chamber - The combustion chamber is machined into the

bottom of the cylinder head. This is where the glow plug ignites the fuel.

The shape of the combustion chamber is designed to promote more

efficient burning of the fuel.

Connecting rod - The connecting rod transfers the piston motion to the

crankshaft. The TRX 3.3 Racing Engine uses a “knife-edged” connecting

rod. The aerodynamic, sharpened edges allow it to “slice” through the

pressurized air/fuel mixture inside the crankcase.

Crankcase - The engine’s “body” that contains all of the running

mechanical components.

Crankshaft - The main shaft of the engine that holds the

reciprocating assembly.

Cooling fins - The cooling fins are milled into the cylinder head and

crankcase and cause heat to be drawn away from the engine. Heat is

removed when it dissipates into the air passing across the cooling fins.

It is important to keep the fins clean of dirt and debris for maximum

cooling efficiency.

Cylinder head (head) - The finned aluminum part on top of the engine

that is responsible for dissipating most of the engine’s heat. The

combustion chamber is machined into the bottom of the head.

Dyno - Abbreviation for dynamometer. A precise piece of testing

equipment that accurately measures engine power and torque output

over the engine’s entire rpm range.

EZ-Start - Traxxas on-board electric starting system. The system consists of

a hand held starter control unit and an on-board gearbox with an electric

motor to spin the engine.

Filter foam - The oiled foam element inside the air filter housing. The filter

foam in the TRX 3.3 must be thoroughly cleaned and re-oiled after every

hour of run time.

Fit - Usually refers to the fit of the piston and sleeve. If the fit is tight, the

piston will feel very tight at top of the sleeve (top dead center), and the

engine will have good sealing and compression. If the fit is loose,

compression will be low and both the piston and sleeve should be

replaced.

Flame-out - Occurs when the engine stops running at high rpm. Usually

the fault of an excessively lean fuel mixture or glow plug failure.

Fuel - (10%, 20%, 33%) The TRX 3.3 must have model engine fuel to run.

Traxxas Top Fuel

™

is recommended. Fuel is sold in quarts and gallons

from hobby dealers. The 10%, 20% and 33% labeling refers to the

percentage of nitromethane contained in the fuel.

Fuel mixture - The ratio of fuel to air as determined by the needle settings

of the carburetor.

Fuel tubing (fuel line) - The thick silicone tubing that carries fuel

from the fuel tank to the carburetor.

Glow plug - The glow plug is located in the cylinder head at the top of the

combustion chamber. It contains an element that glows red hot when

voltage is applied. When the engine is being started, the heat from the

glow plug ignites the fuel mixture and starts the combustion process.

The TRX 3.3 Racing Engine

Revo 3.3

•

Glow plug driver - This tool clips onto the glow plug and supplies the

required voltage to light the glow plug element. It is also called an

igniter. EZ-Start equipped engines do not require this separate tool.

Header - The aluminum tube that connects the exhaust system to the

engine exhaust port. The length and diameter of the header must be

carefully selected to extract the most power from the engine.

High-speed needle (HSN) - Adjusts the carburetors fuel/air mixture at

high throttle openings.

Idle speed - The speed (rpm) the engine runs at when the transmitter’s

throttle trigger is at neutral.

Idle speed screw (ISS) - Located on the carburetor body. This screw

adjusts the idle rpm of the engine.

Lean - A running condition where the engine is not getting enough fuel

(for the available air). Symptoms include engine overheating, or the

engine runs for a short time and then stalls, particularly at high speed.

This is a dangerous condition that should be corrected immediately or

it can ruin your engine.

Leaning the mixture - Turning either the high-speed and/or low-speed

needle(s) clockwise to decrease the amount of fuel the engine receives.

Low-speed needle (LSN) - Needle valve that controls the fuel mixture at

low throttle openings.

Needle valve - Valve consisting of a tapered needle that closes against a

corresponding seat to regulate fuel flow.

Nitro - Abbreviation for nitromethane, a component of model engine

fuel that improves fuel combustion and power output. Nitro also refers

to a class of R/C powered by model engines instead of electric.

Nitro content - The amount of nitromethane used in the fuel. Usually

measured as a percentage of the total fuel volume. Traxxas engines are

optimized to use 10-20% nitro. 33% nitro may be used for racing.

Nitromethane - Nitromethane is a component in the fuel that increases

power from the combustion process up to a point. Engines are

generally optimized to use a range of nitro content for the best power.

O-ring - Rubber “O”-shaped ring used as a sealing gasket.

Pipe - Abbreviation for the tuned exhaust pipe on a nitro engine.

See “Tuned Pipe”.

Piston - The piston is the internal engine part that is attached to the

upper end of the connecting rod and moves up and down in the

cylinder sleeve. The precise fit between the piston and the sleeve

creates a seal that allows the engine to have the required compression

for combustion.

Port - Ports are openings in the sleeve that allow atomized fuel to enter

the combustion chamber and burned exhaust gases to exit. The shape

and location of the ports are a large factor in controlling the engine

timing and power output.

Priming - Manually causing fuel to move from the fuel tank up to the

carburetor. This is sometimes necessary after the engine has been

sitting for a long period of time and all of the fuel has drained back to

the tank. On a Traxxas model this is done by holding your finger over

the exhaust tip for one or two seconds while the engine is starting.

Punch - A term that refers to how quickly the model responds to throttle

input or how quickly it accelerates.

Rich - A running condition where the engine is getting too much fuel for

the available air. It is better to run an engine slightly rich to increase

engine life. Excessively rich mixtures cause the engine to have sluggish

performance with exaggerated blue smoke and unburned fuel coming

from the exhaust.

rpm - Abbreviation for revolutions per minute (how many times the

engine crankshaft spins in a minute).

Sleeve - Internal engine part that contains the piston. The precise fit

between the sleeve and the piston creates a seal that allows engine to

have the required compression for combustion. The sleeve in a TRX

engine is made of brass and is then hard-chrome plated.

Slide carburetor - The throttle on a slide carburetor closes and opens by

sliding a barrel in and out of the carburetor body. This type of

carburetor is preferred for performance use because it provides a less

restrictive “straight-through” air path than the barrel carburetor design.

Stall - When the engine stops running, usually due to an incorrect fuel

mixture setting or running out of fuel.

TDC - Top dead center. The top-most position of the engine

piston stroke.

Tuned pipe - The tuned exhaust pipe usually consists of a specially-

shaped metal or composite chamber with baffles that is designed to

enhance the power output of the engine.

Wear-in - Fitment process that occurs during engine break-in where

internal engine parts develop an even more precise matched fit

through actual use under controlled circumstances.

WOT - Abbreviation for wide-open throttle.

The TRX 3.3 Racing Engine

•

Revo 3.3

DANGER! Model engine fuel

is poisonous to humans

and animals. Drinking the

fuel can cause blindness

and death. Handle with

care and respect. Keep it

out of reach of small

children at all times! While

driving, do not leave your

fuel dispensing bottle on

the ground where a child

could have access to it.

Follow fuel label warnings.

The Fuel

Use the Right Fuel

It’s imperative that you use the correct fuel in your

TRX 3.3 Racing Engine for maximum performance

and engine life. Traxxas Top Fuel

™

should be used

to ensure correct engine lubrication, performance,

and ease of tuning. Traxxas Top Fuel has been

proven in thousands of engines, so you can count

on it every day for great performance.

Top Fuel is the only fuel which is

100% certified for use in Traxxas engines.

Traxxas Top Fuel is made with just the right balance of the highest

grade natural and synthetic lubricants to allow excellent throttle

response and the best top-end performance, without sacrificing

long-term durability.

All of the components in the fuel are carefully selected from the

best materials available and then custom blended to match the

metallurgy and temperature characteristics of Traxxas engines.

You may use 10%, 20% or 33% nitro-content fuel. Try to use the same

percentage all the time, avoid switching back and forth between fuels.

We recommend that if you break in your engine on 20% fuel that you stick

with that percentage. If you do move to a higher or lower percentage,

make sure you readjust your fuel mixture to compensate (see below).

Choosing a Nitro Percentage

A commonly asked question is "what is the difference between 10%, 20%,

and 33% fuels?" Increasing the nitro in the fuel is almost like adding extra

oxygen to the combustion process. It burns more efficiently, improves

combustion, and delivers more power. When increased nitro is used, more

of the other fuel components are then required inside the combustion

chamber to maintain the perfect air/fuel ratio. Therefore, overall fuel

mixtures need to be richened slightly (on the high speed needle, about

3/4 of a turn counterclockwise when changing from 20% to 33%, about

1/2 of a turn counterclockwise when changing from 10% to 20%). This

allows greater fuel flow through the engine and promotes cooler running,

even at the maximum lean settings.

If 33% improves power, then it seems that the highest nitro content

available (beyond 33%) should always be used in the engine. In reality,

there are practical limitations. Engines are designed to run best within a

range of nitro percentages. How the engine is ported, the size of the

combustion chamber and other factors determine how much nitro can be

efficiently used in the engine. The TRX 3.3 Racing Engine responds

exceptionally well to a maximum of 33% nitro, returning cooler temps,

more power, and a smoother throttle response. For those who want to run

higher nitro, 33% Top Fuel is the optimum nitro percentage for the TRX

3.3 Racing Engine. Increasing the nitro beyond 33% can introduce the

need for engine modifications (ports, head shimming, etc.) to avoid

starting and tuning difficulties. There are limits to how much nitro an

engine can effectively use to make more power. Lower nitro percentages

have their own advantages. Nitro is an expensive component in the fuel

so 10% nitro blend is more economical for the sport user. 10% also

provides greater latitude with the needle settings for easier tuning.

When using Traxxas Top Fuel, using higher nitro percentages does not

cause the engine to wear out faster. 33% Top Fuel contains the same

quality lubrication package as 10 and 20% Top Fuel. Some non-Traxxas

high-percentage nitro racing fuels do sacrifice some lubrication in

attempts to increase performance. We urge you to not take chances with

your engine investment and use Top Fuel for consistent performance and

long engine life.

What about Other Fuels?

Can other brands of fuel be used besides Top Fuel? There are other fuels

that can provide satisfactory performance; however there could be long-

term costs in the form of decreased engine performance, loss of tuning

ease, and shorter engine life. Only use fuels that contain both castor and

synthetic oil.

Everyone has an opinion or a claim to make about fuel. The engineering

team at Traxxas has spent years developing TRX Racing Engines. No one

knows more about the specific fuel requirements of Traxxas engines,

than Traxxas engineers. We strongly urge you not to take chances with

your engine investment and use the Traxxas fuel made for the TRX 3.3

Racing Engine.

Handling the Fuel

Follow all directions and warnings on the fuel can.

Keep the fuel tightly capped at all times. Some components in the fuel

can evaporate very quickly and upset the balance of the fuel.

Do not store unused fuel in the fuel dispenser. Immediately return fresh

unused fuel back into the fuel can.

Do not mix old and new fuel. Never mix different fuel brands together.

Store the fuel in a cool dry location, away from any source of heat,

ignition, or combustion.

Read and follow the safety precautions on page 4 in this manual.

The TRX 3.3 Racing Engine

Revo 3.3

•

Filling the Fuel Tank

Use a fuel dispensing bottle (Traxxas Top Fueler, part

#5001) to put fuel into Revo’s fuel tank. To fill the fuel

bottle, squeeze the air out, insert the dispenser tip into

the fuel can, and release your grip on the bottle.

As the bottle expands, fuel will be

drawn into it.

To fill your model, pull up on the

fuel cap handle, insert the tip of the

fuel bottle, and squeeze to

dispense the fuel.

The Air Filter

The TRX 3.3 Racing Engine air filter

is specifically designed to deliver

maximum performance while

protecting your engine from dust and dirt. Use only the supplied filter.

You

will not improve engine performance by switching to an aftermarket

filter

, and you may risk engine damage due to poor filtration.

The TRX 3.3 Racing Engine air filter assembly consists of 3 pieces:

1. A rubber filter base.

2. A plastic housing consisting of a permanently

assembled mesh cap and body.

3. An oiled foam element.

You must clean the filter after every hour of run time, even if the filter

looks clean. This includes the break-in time. Clean your air filter after

break-in.

Dust (which is often too fine to see) and dirt constantly move

through the filter anytime the engine is running. Even if you can’t see dirt

on the filter, it is present inside the foam after any amount of run time. If

you exceed the recommended cleaning intervals, your engine will be

damaged. Engine damage or wear due to dirt ingestion is easy to detect,

and one of the top causes of premature engine failure.

Air Filter Cleaning Instructions

1. Remove the air filter from the carburetor

bore by pulling the entire filter assembly

firmly to the side to release it.

Do not pull

straight up.

2. Disassemble the filter. Pull the rubber air

filter neck out of the filter body. With the

base removed, the foam element is visible

in the bottom of the filter body. Pull out the foam element.

3. Clean the filter parts by thoroughly washing all three pieces of the filter

assembly in hot soapy water (dishwashing detergent works well).

Repeat twice.

4. Thoroughly dry the parts with a clean towel or compressed air.

Remember to wear your safety glasses when working with

compressed air.

5. Oil the foam element with foam filter oil. Use the supplied Traxxas filter

oil (part# 5263) or a high-quality, special-purpose foam filter oil like

what is used for off-road motorcycle and ATV engines.This type of filter

oil is available at motorcycle pro-shops. Apply 30 drops of the Traxxas

filter oil evenly to the top, bottom and sides of the filter element (30

total drops divided among the 3 surfaces). Squeeze the filter element

repeatedly to help spread the oil throughout. The filter element should

be evenly colored by the oil. Even color indicates that the oil is

distributed evenly.

Do not squeeze out excess oil.

Note: Do not use the air filter oil for anything other than the air filter.

It is not meant to be a lubricant.

6. Reassemble the filter and install it on the engine, making sure

the rubber filter neck fits securely on the carburetor with no gaps

or air leaks.

The TRX 3.3 Racing Engine

•

Revo 3.3

See page 31 for more

information on how

air density affects

engine tuning.

The Carburetor

Understanding the Carburetor adjustments

The carburetor performs several functions. It controls the engine’s speed

by restricting the intake of air and fuel into the engine. It atomizes the

fuel (suspends the fuel droplets in the air) and also controls the air/fuel

ratio of the mixture entering the engine (how much air for a given

amount of fuel).

To help provide a better understanding of engine tuning and why it’s

necessary, the following is a brief explanation of the air/fuel combustion

process that takes place inside the engine.

In order to create the cylinder pressure that results in power, the engine

burns the air/fuel mixture. Both air and fuel, in correct amounts, are

needed for proper combustion. It is the carburetor’s job to mix the air

and fuel together (atomize the fuel), in the correct proportion for the

best possible combustion. This is the ideal air/fuel ratio. The ideal air/fuel

ratio required for the engine remains roughly constant. Due to variations

in atmospheric conditions (temperature, humidity, altitude etc.) fuel flow

adjustment valves (called fuel mixture needles) are required to meter the

fuel and maintain the ideal air/fuel ratio in these ever-changing

conditions. For example, colder air is more dense (more air molecules)

for a given volume of air and therefore requires more fuel (more fuel

molecules) to maintain the correct air/fuel ratio. Warmer air is less dense

(fewer air molecules) and therefore needs less fuel to maintain the

correct air/fuel ratio. The tuning needles are there to adjust how much

fuel is made available for the carburetor to mix with the available air

(atomization).

The Fuel Mixture Needles

The amount of fuel metered and atomized by the carburetor is

controlled by the two mixture needles, the high-speed needle and the

low-speed needle. The low-speed needle is used to meter the fuel used

by the engine at idle and low rpm (part-throttle) engine speed. The high-

speed needle is used to meter the fuel when the throttle is open from

part throttle to wide-open throttle (WOT). Two needles on the TRX 3.3

Racing Engine provide precise control of the air/fuel ratio across the

engine’s entire rpm range.

The maximum possible fuel flow is always controlled by the high-speed

needle. It works like the main water valve on a garden hose. Turn it

clockwise to close the valve, counter-clockwise to open it. When the

throttle is at idle or partially open, the low-speed needle meters the fuel

flow at the outlet (needle seat) where the fuel enters the carburetor

venturi. This second valve acts like the spray nozzle at the end of the

garden hose in our example. When you accelerate from idle, the throttle

opens and the low-speed needle is pulled away from the needle seat.

This allows more fuel to flow with the increased air flow. As the throttle

The TRX 3.3 Racing Engine

Air

Fuel

Cold Air (More Dense)

(Warm Air) Less Dense

Start

1/8 Turn

45°

Full Turn

360°

1/2 Turn

180°

1/4 Turn

90°

3/4 Turn

270°

A “turn” refers to

tightening (“turning in”) or

loosening (“turning out”)

mixture needles. A “full

turn” refers to turning the

needle 360°, so a “1/2 turn”

would be 180°, a “1/4 turn”

would be 90°, and so on.

Revo 3.3

•

is increased, the low-speed needle is pulled completely away from the

needle seat leaving it fully open. At that point, fuel metering is entirely

controlled by the high-speed needle. Again, using our water hose

example, when the spray nozzle at the end of our garden hose is fully

open, then the main water valve can be used to adjust how fast the

water flows.

The engine’s performance is directly linked to the fuel mixture.

Richening the fuel mixture increases the amount of fuel in the air/fuel

mixture ratio and leaning the fuel mixture decreases the amount of

fuel in the air/fuel mixture ratio.

Slightly lean fuel mixtures deliver stronger, more efficient

combustion and more power, but with less lubrication.

Slightly rich fuel mixtures deliver cooler running and more

lubrication but with slightly less power.

Tuning the engine means finding the perfect balance between the two;

excellent power to meet your needs while maintaining good lubrication

for long engine life.

The optimal fuel mixture setting is rich to provide a

safety margin against having a lean condition if some variable changes

(such as the temperature from one day to the next).

General fuel mixture settings are measured by the number of turns the

needles are turned out from fully closed. The fuel mixture settings have

been pre-set from the factory to typical break-in settings. Do not

readjust your carburetor from the factory settings until after the engine

is started and running, and you have been able to observe the engine

running to assess what minor adjustments may be required to

compensate for fuel, temperature, and altitude. Adjustments are usually

made in 1/8 or 1/16-turn increments. If the engine sticks at TDC, see

page 41 for instructions on freeing the engine.

The Idle Speed Adjustment

The idle speed screw controls the closed position of the throttle slide.

When the throttle servo is in its neutral position, the throttle slide should

be stopped against the idle adjustment screw. Always use the idle speed

adjusting screw to control engine idle. Do not use the throttle trim on

the transmitter to adjust idle speed. The idle speed should be set as low

as possible and still maintain reliable running.

Water Valve

(Controls Overall Flow)

High Speed Needle

Water Nozzle

(Controls Fine Flow)

Low Speed Needle

Richen

Lean

Rich

See Tuning Your TRX 3.3

Racing Engine on page 30

for complete information on

adjusting the air/fuel

mixture and idle speed.

Factory Needle Settings

If your factory preset

carburetor adjustments

have been tampered with,

use the following settings:

• Set the high-speed needle

to 4 turns out from closed.

• Set the low-speed needle

so the screw head (red in

Fig. A) is flush (even) with

the end of the slide (yellow

in Fig. A).

Always use the factory

settings for initial starting.

Only use these settings

when the factory settings

have been lost.

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance.

Low Speed

Needle Adjustment

Fig. A

The TRX 3.3 Racing Engine

•

Revo 3.3

The TRX 3.3 Racing Engine

The Traxxas EZ-Start brings the convenience of push-button electric

engine starting to your Revo. The EZ-Start consists of a hand-held

control unit and an on-board motorized starter.

Power for the EZ-Start system comes from a 7.2-volt rechargeable

battery pack installed in the hand-held control unit (battery

sold separately).

The engine glow plug is heated automatically by the EZ-Start system,

eliminating the need to keep up with a separate glow plug igniter.

The voltage to the glow plug is kept constant, regardless of the load

placed on the starter by the starter motor.

The “Glow Plug” LED (light emitting diode) on the control unit

indicates the condition of the glow plug.

The “Motor” LED indicates the status of the EZ-Start electric

starter motor.

The cush drive mechanism in the drive unit prevents damage to the

gears caused by engine kickback.

Smart Start

™

protection circuitry prevents damage to the motor by

cutting power if the load on the motor or other electronics exceeds

safe limits.

Charging the EZ-Start Battery with the TRX Power Charger

The included TRX Power Charger can be used to charge the EZ-Start

battery pack.

1. Set up the charger as described on

page 12 using either the A/C power

supply or optional D/C adapter.

2. Plug the 7.2-volt battery adapter

into the charger output cord.

3. Connect a 7.2-volt battery pack to

the charger output cord (adapter).

4. The green light on the charger should begin to flash quickly,

indicating that fast charging is in progress.

5. 1500mAh or lower capacity: When the light turns solid green (not

flashing), the battery pack is fully charged and ready for use.

1500mAh or higher capacity: The TRX Power Charger will

automatically shut off after 90 minutes of fast charging time. Batteries

with 1500mAh or higher capacity need more than 90 minutes of fast

charge time. Multiple charge cycles will be required for a fully peaked

charge (solid green light). Refer to the chart below.

*Based on a nominal charge rate of 900mA.

Installing the EZ-Start Battery

The EZ-Start system requires a fully charged 7.2-volt rechargeable NiCad

or NiMH battery pack (not included). Use a charger (not included)

designed for 7.2-volt battery packs. Charge the battery according to the

charger manufacturer’s directions.

1. Press the tab in the end of the battery compartment door to open.

2. Plug a fully charged 7.2-volt battery

pack into the connector inside.

3. Twist the battery two or three

times to twirl the battery plug

wires. This helps hold the wire

and battery in place when the

battery is installed in the

compartment.

4. Install the battery into the

compartment and press the wires

securely into place.

5. Snap the battery compartment

door back on and lock the end tab.

The Traxxas EZ-Start Electric Starting System

Use the Right Charger:

The most convenient type

of charger is an AC peak-

detecting charger that

plugs directly into an AC

wall outlet. It contains

special peak-detection

circuitry that automatically

shuts the charger off when

the battery is fully charged.

If you’re using a 15-minute

timed charger, always fully

discharge the battery pack

before each charge. Some

high mAh battery packs

(1500 mAh or higher)

require more than the

standard 15 minutes of

charge time. If the battery

pack is cold after 15

minutes of charging, add

another 5 minutes of charge

time. Closely monitor the

battery pack and stop

charging it when it begins

to feel warm to the touch.

Never leave a battery

charging unattended.

Always follow charger

manufacturer’s instructions.

Inexpensive overnight wall

chargers may also be used.

Battery Capacity

1500-2500 mAh

3000-3600 mAh

3800+ mAh

Charge Time

100-190 minutes

200-240 minutes

250+ minutes

Number of

Charge Cycles

3-4

(approximate)

Revo 3.3

•

Using the EZ-Start

Your EZ-Start controller plugs into a 4-prong receptacle in the center of

the bed on your Revo. When the red button on the controller is pressed,

the EZ-Start motor begins to spin the engine and power from the control

unit heats the glow plug. Assuming all settings and preparations are

correct, the engine should start almost immediately.

Each of the two status indicator LEDs on

the hand-held control unit, the

Motor

LED and the Glow Plug LED, should

light green while starting. If either LED

fails to light while starting, there is a

fault indicated with that function:

If the

Glow Plug LED fails to light,

the glow plug may be bad, or the

glow plug wire may be damaged

or disconnected.

If the

Motor LED fails to light and

the starter fails to operate, then the

EZ-Start is in protection mode.

Protection Mode

The EZ-Start uses Smart Start

™

technology to monitor the condition of

the system and detect failures. The controller monitors the load being

placed on the EZ-Start motor. If the load becomes excessive, the system

shuts off power to the motor to prevent costly damage to the motor and

the controller. This may occur, for example, if the engine floods with fuel

during starting. The starter spins at first but when excessive fuel in the

combustion chamber begins to lock up the engine, the starter motor

slows under the heavier load. This causes the protection circuit to shut

off the power to the motor. Allow at least 3 minutes for the starter motor

to cool and the circuit to automatically reset before continuing. Use the

time to find and eliminate the condition that caused the excessive load

on the starter motor.

Use a Strong Starter Battery

A weak starter battery, or one that has not been fully charged, may not

deliver enough power to crank the engine over at the appropriate rpm

to keep the piston from sticking at top dead center (TDC). A new engine

will typically have a tight fit between the piston and the top of the

sleeve. This is a tapered fit, and a tight piston sleeve fit on initial startup

is desirable for those who want the best-performing engine. Make sure

you are using a good quality battery pack that is fully charged (new

batteries usually require several charge cycles to reach peak voltage and

full capacity). This is especially important with a new engine that needs

to be broken in. If the engine sticks at TDC, see page 41 for instructions

on freeing the engine.

Shutting Off The Engine

Turning off the switch for the radio will

not shut off the engine. To shut off the

engine, use the shut-off clamp on the fuel

line. Squeeze the clamp closed to shut off

the fuel supply to the engine. Don’t forget

to release it when you restart the engine.

Avoid shutting off the engine by placing your finger over the exhaust

outlet, especially if you are through driving for the day. This will leave

more unburned fuel in the engine that could lead to harmful corrosion.

Always be careful not to touch the exhaust pipe after running, it can

become very hot.

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

PlugPlug

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

MotorMotor

GlowGlow

PlugPlug

Motor

Glow

Plug

Motor

Glow

Plug

When the EZ-Start

controller is in protection

mode, wait at least three

minutes before attempting

to start the engine, to give

the starter motor time

to cool.

It’s normal for your EZ-Start

controller to become warm

after repeated use.

The TRX 3.3 Racing Engine

•

Revo 3.3

See Important Points to

Remember on page 4 for

other precautions.

Never run your Revo

indoors. Since the TRX 3.3

Racing Engine exhaust

fumes are harmful, always

run your model outdoors, in

a well-ventilated area.

Your TRX 3.3 Racing Engine

doesn’t usually require

priming. If you do need to

prime your engine, watch

the fuel line carefully to

avoid flooding your engine.

See page 44 for information

on clearing a flooded engine.

Factory Needle Settings:

Your carburetor is preset at

the factory to give the

correct air-to-fuel ratio and

idle speed for engine break-

in. Do not adjust the

carburetor unless you

observe a poor running

condition that requires

correction (see page 25 for

stock settings).

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance. See page 22

for more information.

Breaking in Your TRX 3.3 Racing Engine

The TRX 3.3 Racing Engine uses a ringless, aluminum-brass-chrome (ABC)

piston/sleeve construction. This type of engine design relies on a very

precise running fit between the piston and sleeve for cylinder sealing.

Engine break-in is necessary to allow the piston and sleeve to develop

an extremely precise fit and optimum cylinder sealing. Therefore,

proper engine break-in is critical to achieving the fastest, most reliable

engine performance.

Allow yourself about 1 to 1

hours to complete the break-in procedure.

The engine break-in period will take 5 tanks of fuel in a Revo. The break-

in time is not the time to impress your friends with your new Revo.

You

must wait until the engine is fully broken in before attempting

sustained high speed running.

Patience and careful attention during

break-in will reward you with the best-performing TRX 3.3 Racing Engine

possible.

During break-in, your engine may appear to malfunction with symptoms

like stalling, inconsistent performance, and fouled glow plugs. These are

simply the normal “break-in pains” engines sometimes go through. They

will disappear once your engine is fully broken in. Many owners report

not experiencing any of these symptoms with TRX Racing Engines.

recommend to go ahead and replace the glow plug with a new one

after the engine break in procedure.

Engine Break-in Procedure

The focus during break-in is to vary and limit the engine speed. This will

be accomplished by accelerating and stopping at different rates for the

first 5 tanks of fuel. As the engine begins to break-in, the duration and

intensity of the acceleration will gradually increase.

Sustained high-

speed running is not permitted until the 6th tank of fuel.

Perform the

initial break-in on a large, flat, paved surface.

Revo is very fast and by

tanks 4 and 5 you will need plenty of room for the truck to run in.

Apply all throttle and braking actions gently. Abrupt acceleration or

braking could cause the engine to stall unnecessarily.

Special break-in fuels are not recommended. Use the same fuel you

plan to use everyday.

If possible, avoid breaking-in the engine on extremely hot or cold days

(see page 30).

Pay careful attention to the fuel level. Do not allow the fuel tank to run

completely empty. An extremely low fuel level causes the mixture to

run too lean. This could result in a burned glow plug or extremely high

engine temperatures.

Do not attempt to break in the TRX 3.3 Racing Engine by idling it on a

stand. This will produce poor results.

Keep extra Traxxas glow plugs handy. The break-in process can cause

deposits to form on the plug leading to plug failure.

Change or clean your air filter after break-in.

Follow the instructions exactly for each of the first 5 tanks of fuel.

Starting Your TRX 3.3 Racing Engine for the First Time

Before you start your TRX 3.3 Racing Engine for the first time, make sure

you have read all instructions and precautions in this manual.

Pay close

attention to the tank-by-tank break-in instructions in the next section,

and make sure you have read and understood them before you run

your engine.

Your engine must be at room temperature (70°F or 21° C) or above the

first time you start it

. If it’s cooler than room temperature outside, remove

all fuel and keep your Revo indoors until you’re ready to start it and then

take it outside. If it’s colder than 45 degrees, special considerations should

be made. See cold weather break-in on page 30. We do not recommend

running the model in temperatures below 35 degrees.

1. Turn on the radio system (see page 16).

2. Make sure the throttle trigger on the

transmitter is in the idle (neutral) position.

3. Connect the EZ-Start controller according to

the instructions on page 27.

4. Press the starter button in short two second

bursts and watch for fuel moving through the

fuel line up to the carburetor. Watch closely!

The fuel moves very fast. If the fuel doesn’t

move through the line within 5 seconds, prime the engine by briefly

(one or two seconds) covering the exhaust outlet with your finger until

the fuel is just visible in the carburetor fuel line.

Watch carefully! If the

engine is primed too long, it will flood with fuel and stop turning.

Once fuel reaches the carburetor, the engine should

quickly start and idle.

6. Disconnect the EZ-Start controller from the model.

7. Proceed with the engine break-in.

8. Do not rev your engine with no load (wheels off the ground).

If your engine doesn’t start, go online to www.traxxas.com/support. If your

factory fuel mixture settings have been altered, refer to page 25. If you still

have problems, contact Traxxas Customer Support at 1-888-TRAXXAS or

[email protected].

The TRX 3.3 Racing Engine

Revo 3.3

•

High Altitude Operation:

If you live in a high

altitude region (5000 or

more feet above sea level),

the lower air density may

require you to lean your

high-speed fuel mixture

slightly from the factory

break in settings. Try this

if you are experiencing

difficult starting or

extremely sluggish

engine performance at

high altitude.

As you gain experience in

the hobby, you may

discover that many people

have differing opinions on

what is the proper

procedure to break-in a

model engine.

Only use the

Traxxas break-in procedure.

Other break-in procedures

could result in a weak,

damaged, or otherwise poor

performing engine.

The

procedure outlined here

was extensively tested and

proven to yield better

performing engines than

other “common” break-in

methods. Even if you have

years of experience using

model engines, please do

not ignore this caution!

Tank

Throttle

1/4

1/2

Full

Time

2 Seconds

3 Seconds

5 Seconds

Cool

15 Minutes

Body

Off

Notes

Apply throttle gradually.

Reduce idle speed if necessary.

Do not allow shifting to high gear.

Accelerate over 3 second count, hold for 2 seconds.

Tank 1

Drive the model with the body off.

Driving procedure: Gently pull the throttle trigger to 1/4 throttle over

a 2-second count. Then gently apply the brake to stop

. Count the two

seconds out while accelerating: one thousand one, one thousand two,

and then stop. Operate the throttle trigger as smoothly as you can.

Repeat this starting and stopping procedure until the first tank of

fuel is nearly empty.

Look for thick blue smoke exiting the exhaust outlet. If there is

no smoke, richen the high-speed needle 1/4 turn, by turning the needle

counterclockwise.

4. When the fuel tank is nearly empty, shut off the engine by pinching the

fuel line connected to the carburetor (use the installed clamp).

5. Let the engine cool for 15 minutes.

Note: If at any point the engine cuts out or stalls during gentle

acceleration, richen the high-speed needle 1/4 turn by turning the needle

counterclockwise.

Tank 2

From tank 2 forward, Revo should be driven with the body on.

Driving procedure: Gently pull the throttle trigger to 1/2 throttle over

a 2-second count. Then gently apply the brake to stop.

Count the two

seconds out while accelerating: one thousand one, one thousand two,

and then stop.

Repeat this starting and stopping procedure until the

second tank of fuel is nearly empty.

When the fuel tank is nearly empty, shut off the engine and let it cool

for 15 minutes.

Tank 3

Driving procedure: Gently pull the throttle trigger to 1/2 throttle over

a 3-second count. Then gently apply the brake to stop.

Count the

three seconds out while accelerating: one thousand one, one thousand

two, one thousand three, and then stop.

Repeat this starting and

stopping procedure until the third tank of fuel is nearly empty.

As the engine loosens, the idle speed may increase and cause

the model to try to creep forward when stopped. Reduce the

idle speed by turning the idle adjustment (see page 19) on the

carburetor counterclockwise.

3. When the fuel tank is nearly empty, shut off the engine and refuel.

From here on, you do not need to let the engine cool between tanks.

Tank 4

Driving procedure: Gently pull the throttle trigger to full throttle over

a 3-second count. Then gently apply the brake to stop.

Count the

three seconds out while accelerating: one thousand one, one thousand

two, one thousand three, and then stop.

Repeat this starting and

stopping procedure until the fourth tank of fuel is nearly empty.

Apply the throttle gradually! Your finger should not reach full throttle

until the end of the three-second count. Revo may try to shift into

second gear. If it does, reduce the throttle input. Do not let Revo shift

out of first gear.

3. Keep your driving smooth and consistent.

4. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 5

Driving procedure: Gently pull the throttle trigger to full throttle over

a 3-second count, hold for 2 more seconds, and then gently apply

the brake to stop.

Count the five seconds out while accelerating.

Repeat this starting and stopping procedure until the fifth tank of

fuel is nearly empty.

The model should now be shifting into second gear. If it is not, try

turning the high-speed needle clockwise 1/8 turn to lean the fuel

mixture slightly and test for shifting.

3. When the fuel tank is nearly empty, shut off the engine and refuel.

Tank 6

STOP! Clean your air filter before you proceed. Refer to the instructions

on page 23. During the sixth tank of fuel, the engine can be tuned

for general performance use. Proceed to the next section in this manual.

The TRX 3.3 Racing Engine

•

Revo 3.3

Winter Break-in Tips

During the break-in process, the piston and sleeve wear into each other to

form a precise fit. The engine needs to heat up to a temperature around 200

to 215 degrees to allow the piston and sleeve to achieve this fit properly. A

precise fit between these two components is critical for proper compression,

and optimum performance. If the engine runs too cold during break-in, the

piston and sleeve will not expand to their appropriate sizes for break-in, and

this can lead to premature wear of these components. This wear may not

become apparent until after winter has past, and the engine is operated

under warmer running conditions.

Warm the engine to approximately room temperature by removing

all fuel and storing the vehicle inside at room temperature until just

before starting the engine. An extremely cold engine can become

difficult to start.

After the engine is running, it is important to keep the temperature of

the engine up around 200 to 215 degrees during break-in. In weather

below 45 degrees, the TRX 3.3 Racing Engine will tend to run at lower

temperatures between 160 to 180 degrees (when tuned at proper break-

in mixture settings). This is too cool for break-in.

Do not lean the fuel

mixture to increase engine temperature!

This will also decrease

lubrication and cause your piston/sleeve to wear prematurely.

Wrap the cooling head with a paper towel,

clean rag or sock to help keep the engine

running around the recommended 200 to 215

break-in temp. If too much heat is contained,

the engine can actually run too hot. Make sure

that you monitor the engine's temp closely for

the first couple of tanks until you get the right

amount of cover for the cooling head. This will,

of course, depend on your current weather conditions. Adjusting the

cover up and down, exposing more or fewer cooling fins, is a convenient

way to regulate engine temps.

For owners that do not have access to a temperature probe, a drop of

water on the cooling head (around the glow plug area) should slowly

sizzle for approximately 6 to 8 seconds around 200 to 210 degrees. If the

water sizzles for only a few seconds, then it is likely that it is over 220

degrees, and needs to cool down. If the water takes a long time or does

not evaporate at all, then the engine is too cool.

We do not recommend that you operate your engine below 35 degrees

Fahrenheit. If you insist on running your vehicle below 35 degrees, be

aware that nitro engines may be very difficult to start and tune at

extremely cold temperatures. Also, at temperatures below freezing, nitro

fuel can actually begin to gel up, and this can be harmful to the engine.

Follow the remaining break-in procedures as outlined in this Owners

Manual. This, along with the steps listed above, will ensure a good break-in

for your new nitro engine, and provide many hours of enjoyment.

Tuning Your TRX 3.3 Racing Engine

The engine’s performance

depends on the fuel mixture.

Turn the mixture needles

clockwise to lean the fuel

mixture and counterclockwise

to richen it. Leaning the fuel

mixture will increase engine

power up to the engine’s

mechanical limits.

Never run

the engine too lean (not

enough fuel flow). Never

lean the engine until it

begins to cut-out or stall.

Leaning the engine beyond

the safe allowable limits will

result in poor performance

and almost certain engine

damage.

Indications of an

overly lean mixture include:

Cutting out or sudden loss of power during acceleration.

Overheating (temperature beyond 270° F at the glow plug).

Little or no blue smoke coming from the exhaust.

If any of these conditions are present, stop immediately and richen the

high speed mixture 1/4 turn. The engine will probably be slightly rich at

that setting and you can then retune for performance. Always tune for

performance by starting rich and moving leaner toward the ideal setting.

Never try to tune from the lean side. There should always be a light

stream of blue smoke coming from the exhaust.

The TRX 3.3 Racing Engine

When tuning for

performance, watch closely

to notice when there is no

longer any increase in speed

or power when the

high-speed mixture is lean.

If you lean the high-speed

mixture to the point that the

engine cuts-out, hesitates,

or stalls, you are well into

the danger zone and engine

damage is likely. Richen the

high-speed needle 1/4 turn

and retune.

For your convenience, the

low-speed needle has a

positive stop that prevents

it from being over tightened

and damaging the needle

and seat. This also provides

an easy way to gauge how

many turns out from closed

the low-speed needle

adjustment is set to.

is..

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher

Lower

Higher

then the air density is...

Slightly more dense

Slightly less dense

Less dense

More dense

Less dense

More dense

Less dense

adjust (correct) the

fuel mixture to be...

Slightly richer

Slightly leaner

Leaner

Richer

Leaner

Richer

Leaner

Richer

If the...

Humidity

Pressure (barometer)

Temperature

Altitude

Nitro %

Fuel Mixture Adjustment Chart

Revo 3.3

•

Before you begin tuning, the engine should be warmed up to its normal

operating temperature and running slightly rich. All final tuning adjustments

must be made to the engine at its normal operating temperature. You can

tell the engine is running rich by noting any of the following:

Sluggish acceleration with blue smoke coming from the exhaust.

Revo may not shift into second gear.

There is unburned fuel spraying from the exhaust tip.

Leaning the high-speed fuel mixture increases performance.

High-Speed Fuel Mixture Adjustment

With the engine warm and running at a rich setting, gradually lean the

high-speed fuel mixture in 1/16 turn increments. Make several high-

speed passes after each adjustment to clear out the engine and note any

change in performance. The TRX 3.3 is extremely powerful. Remember to

apply the throttle gradually to prevent wheelies or loss of control.

Continue this procedure until there is no longer any performance

improvement.

If any one of the following conditions occurs, the fuel

mixture is already past the maximum safe lean setting:

There is no longer any performance improvement.

2. The engine begins to cut out at high speed (Danger!).

3. There is a sudden loss of power during acceleration (Danger!).

4. The engine begins to overheat. Symptoms of overheating include:

Steam or smoke coming from the engine (not exhaust).

Hesitation or stalling during acceleration.

Popping or clattering sound when decelerating (detonation).

Fluctuating idle speed.

Temperature measurement above 270° F at the glow plug

(A temperature reading above 270° alone does not necessarily

indicate overheating. Look for other symptoms of overheating

combined with temperature for a more accurate warning).

Richen the fuel mixture to the optimum setting by richening the high-

speed needle at least 1/8 turn counterclockwise and retest. This setting

will extend engine component life.

Low-Speed Fuel Mixture Adjustment

The low-speed mixture is always set after the high-speed needle is correctly

adjusted. The low-speed mixture is set using the pinch test.

1. Once the engine is warm, do several high-speed runs to confirm

that the high-speed needle is set correctly.

2. Bring the vehicle in and pinch closed the fuel line going into the

carburetor (use the engine shut-off clamp). The engine should run for 2-3

seconds, speed up, and then shut off.

3. If the engine runs longer than 3 seconds, then lean the low-speed needle

1/16 turn, make several more high-speed runs, and retest.

4. If the engine shuts off immediately without speeding up, then richen the

low-speed needle 1/8 turn, make several more high-speed runs, and retest.

When the low-speed needle is set correctly, the engine’s throttle response

should be very quick, even to the point of making it difficult to keep Revo

from doing a wheelie when you accelerate!

The TRX 3.3 Racing Engine

When adjusting the low

speed fuel mixture, it is

very important to make

several high-speed runs

with Revo between

adjustments to clear out

any excess fuel. Perform

the pinch test immediately

after. If the engine is

allowed to idle for a long

period of time, it could

“load up” with fuel and

give you an inaccurate

measurement from your

pinch test.

Higher nitro requires a

richer fuel mixture. When

running 33% fuel, richen

your high speed needle 3/4

turn if previously running

20% nitro and then re-tune

the engine for maximum

performance. See page 22

for more information

•

Revo 3.3

Idle Speed Adjustment

Once the high and low-speed mixtures have been set, reduce the idle speed

to the minimum reliable idle speed. Remember, this adjustment should be

made while the engine is running at normal operating temperature.

1. Turn the throttle trim on the transmitter so the brakes are

applied (note its original position). This ensures that the throttle

slide is resting against the idle adjustment screw.

2. Turn the screw counterclockwise to reduce the idle speed, or clockwise to

increase it. The idle speed should be set as low as possible while still

maintaining reliable running characteristics.

3. Reset the throttle trim on the transmitter to its original position.

Fine-Tuning the Carburetor

After fine-tuning your TRX 3.3 Racing Engine at the end of the break-in

procedure, no major adjustments to the fuel mixture are usually necessary.

Make note of the temperature, humidity, and barometric pressure at the

time you finished fine tuning your carburetor. Current weather conditions

can be found online from national websites, local TV news websites, and

television. This information will be considered your baseline setting.

You may need to adjust your carburetor needles to compensate for changes

in temperature and barometric pressure (air density) from day to day.

Generally, you’ll need to richen the fuel mixture when the weather is colder

than your baseline temperature and the air density is higher. Lean the fuel

mixture when weather is warmer than your baseline temperature and the air

density is lower. The chart below provides general guidelines on how

weather conditions affect air density when they move higher or lower than

your baseline setting (see page 24 for detailed info on how air density affects

mixture settings).

Tuning the Engine by Temperature

The following procedures require an optional

infrared temperature probe or on-board

temperature gauge (Traxxas on-board digital

temperature gauge, part #4091). Engine

temperature can be used as an effective tuning

aid when you understand the relationship between engine temperature and

ambient temperature. The engine operating temperature, when tuned for

maximum performance, will vary according to atmospheric conditions,

engine load, gauge accuracy, and many other factors. The atmospheric

condition that has the most influence on engine temperature is air

temperature. Expect the engine temperature to vary almost in direct

proportion to air temperature. Assuming you tuned the engine for the same

maximum performance each day, the engine will run about twenty degrees

hotter when it’s ninety degrees outside than it would in seventy-degree

weather. For this reason, we cannot give you a definitive temperature range

that indicates the best possible engine tuning.

There is NO optimal temperature that can be used as a target to deliver

the best engine tuning. Do not rely on a temp gauge alone to tune your

engine. Tune the engine by paying very close attention to how it

responds to changes in fuel mixture (more smoke/less smoke,

fast/sluggish, reliable/stalling, smooth sound/ muffled sound, etc)

Once the engine is tuned, then observe the temperature.

The temperature gauge can aid you in tuning by giving you a relative

indication of how your adjustments are affecting the engine and to help

prevent you from reaching excessive engine temperatures. For example, as

you lean the fuel mixture, the engine performance will increase along with

the temperature. If you continue to lean the fuel mixture and the

temperature increases but the engine performance does not change, then

you have exceeded the maximum safe lean setting. Make note of the engine

temperature. Generally, try to keep your engine from exceeding 270°F when

measured at the glow plug. If necessary, increase airflow to the engine by

cutting out the rear of the body, windshield, and front valance. In some

situations, the engine may perform very well with no stalling, lagging, or

hesitation at temperatures above 270°F, particularly in very hot climates.

If richening the fuel mixture to bring the temperature down to 270°F results

in poor, sluggish performance (engine never cleans out) then return the

engine back to a satisfactory state of tune based on how it sounds and

performs (always with a visible stream of blue smoke coming from the

exhaust). If engine temperature is exceeding 270°F with proper cooling

and no signs of abnormal running, then avoid running the engine at its

maximum lean setting. Watch closely for

any signs of overheating.

Richen the fuel mixture slightly to provide a safety margin of additional

cooling lubrication.

Symptoms of overheating include:

Steam or smoke coming from the engine (not exhaust).

Hesitation or stalling during acceleration.

Popping or clattering sound when decelerating (detonation).

Fluctuating idle speed.

The TRX 3.3 Racing Engine

Revo 3.3

•

Introduction

Your TRX 3.3 Racing Engine is broken in, the fuel mixture is balanced,

and the idle is set…now it’s time to have some fun! This section contains

instructions on forward/reverse shifting, and making adjustments to

your Revo. Before you go on, here are some important precautions to

keep in mind.

Don’t run your Revo in water, mud, snow, or wet grass.

It’s tempting, but water and mud are easily drawn through the air

filter and will severely damage the engine. Small amounts of moisture

can cause electronics to fail and loss of control over your Revo.

The TRX 3.3 Racing Engine is extremely powerful. Remember to apply

the throttle gradually to prevent wheelies or loss of control.

Don’t hold Revo off the ground and rev the engine excessively with

no load on the engine. This practice could result in internal engine

damage. Avoid over revving the engine when Revo is airborne after a

jump.

Avoid excessive high-speed running for extended periods of time or

over long distances. This could cause the engine to build up enough

speed to exceed maximum safe RPM limits.

Don’t drive your Revo with drive train damage of any kind.

The engine could be damaged due to overloads caused by

drivetrain friction, or over-revving caused by loose or missing parts.

Don’t tow anything with your Revo. The engine is cooled

by airflow created by speed. Towing creates a high load on the

engine, and at the same time limits cooling of the engine due to

low vehicle speed.

If your Revo gets stuck, stop driving immediately. Move the vehicle

and then continue driving.

Never turn off the radio system while the engine is running. The truck

could run out of control.

Forward and Reverse Operation

Forward and reverse gears are

selected with the shift button

located in the transmitter handle

grip. The switch is normally in the

down, or forward, position.

To shift into reverse, bring your

Revo to a

complete stop and

push the shift button up.

Accelerate to engage the gear.

To return to forward gear, repeat the same procedure and move the

shift button down.

Revo will not shift between forward and reverse unless the truck is

stopped. If it will not shift, then refer to the troubleshooting section

on www.Traxxas.com or call Traxxas support.

Driving Tips

Monster trucks by design have a high center of gravity that requires a

different driving technique. To prevent rollovers, slow down as you

approach turns and then apply moderate throttle through the turns.

This technique will help Revo grab the surface and turn sharper.

Do not apply brakes and turn the wheel at the same time. You could

tip the truck over.

When jumping, apply some throttle while Revo is in the air to keep

the truck’s nose up and land level on all 4 wheels. Be careful not to

over-rev the engine or land at full throttle. Either could seriously

damage your Revo. If the nose of the truck is too high, then quickly

tap the brake to level the truck in the air.

Drive over large obstacles (such as curbs and rocks) at an angle,

instead of head on. This will allow the suspension to articulate and

absorb the impact much easier.

Even though Revo is capable of high speed in reverse, it is very

difficult to control while driving in reverse. Limit your reverse speed

to prevent crashing or flipping your Revo.

Change or clean your air filter element after each hour of running.

This is critical for the life of your engine. Running time includes the

engine break-in period.

Driving Your Revo

ACCELERATE BRAKE

NEUTRAL

SHIFT

REVERSE

SHIFT

FORWARD

•

Revo 3.3

Basic Tuning Adjustments

This tuning and setup guide is separated into two sections- Basic and

Advanced. Revo does not require any specialized knowledge or

understanding of its unique suspension and drive train to perform

typical, everyday setup and track tuning adjustments. Adjustment

procedures for alignment, spring rate, damping, steering, and ride

height are covered in the basic tuning section. Adjustments for the gear

ratio, two-speed shift point, slipper clutch, and brake are also covered. In

most cases, the basic information is all that is needed to tune Revo to

perform well on a variety of surfaces.

Revo was engineered to provide sophisticated additional tuning options

well beyond the basics that allow expert users to extract the maximum

performance from the truck. The advanced tuning section (beginning on

page 42) covers topics such as optional suspension rockers, roll center

adjustment, caster adjustment, bump steer tuning, differential setup,

and fine tuning the two-speed gear ratios. Make sure you fully

understand the basic adjustments before experimenting with the

advanced adjustments. Improper combinations of adjustments can

adversely affect the performance of the truck, resulting in poor handling.

If you don’t know why you are changing an adjustment then you should

leave it at its factory setting. Also included are instructions for using the

Long-Travel rockers and springs supplied with Revo. The long travel

rockers allow extreme suspension travel for rock crawling and rough,

large-scale terrain. The long travel rockers allow the suspension to

operate at its extreme mechanical limits and is recommended for

advanced users.

Suspension Tuning

Springs

The front and rear springs on Revo have different spring rates. The

rear springs are about 20% stiffer than the front springs. The spring’s

pre-load tension can be adjusted by turning the spring pre-load adjuster.

Adjusting the pre-load changes the suspension sag. Suspension sag

basically defines how much the suspension compresses when the truck

is at rest. Adjust the pre-load so that the suspension compresses about

one third of its full suspension travel (see illustration). If suspension sag is

severe and requires a large increase of the spring pre-load to

compensate, then a firmer spring should be used. Firmer springs

(supplied) must be used when the Long Travel rocker arms are installed.

Use a stiffer spring to reduce sag, reduce body lean, control brake dive,

and provide a firmer, more responsive overall feel. If Revo is lightened

significantly for racing

applications, softer

springs will be necessary

to allow the suspension

to sag properly. Heavier

configurations will

require stiffer springs.

Ride height is adjusted by

changing the length or

position of the pushrods

in the lower suspension

arms. See the next

section for ride height

adjustments. The suspension sag and spring pre-load should be

readjusted anytime the springs are removed and/or replaced.

Optional springs available from Traxxas are listed below. Refer to your

parts list for a complete part number listing. Higher rate springs are

stiffer. Springs can be identified by dots of color on one end.

Ride Height Adjustment

The rocker arm suspension uses push rods on each suspension arm.

Changing the length and/or position of the push rod adjusts the ride

height without affecting or compromising other suspension parameters.

For example, you can raise and lower the ride height without changing

up/down travel distribution, changing springs, or affecting your

progressive rate. This feature is unique to Revo and is extremely

beneficial in a racing environment where you can achieve a low center of

gravity (by lowering the ride height) without losing any suspension

capability. Increasing the ride height will increase ground clearance for

rough terrain.

90mm Travel

Dot Color Spring Rate

Yellow 14.8 lb/in

(2.6 N/mm)

White 16.6 lb/in (2.9 N/mm)

(Standard Front)

Orange

18.3 lb/in

(3.2 N/mm)

Green 20.0 lb/in (3.5 N/mm)

(Standard Rear)

Gold 21.7 lb/in (3.8 N/mm)

Tan 23.4 lb/in (4.1 N/mm)

Black 25.1 lb/in (4.4 N/mm)

120mm Long Travel

Dot Color Spring Rate

Silver 28.0 lb/in

(4.9 N/mm)

(Standard Front)

Pink 30.8 lb/in (5.4 N/mm)

Blue

33.7 lb/in

(5.9 N/mm)

(Standard Rear)

Purple 36.5 lb/in (6.4 N/mm)

Note: 90mm Travel springs are

not recommended for use with

the Long Travel Rockers.

Compression 2/3

Sag (Droop) 1/3

Ride Height

To tal Travel

Axle Centerline at Ride Height

Axle Centerline at Max Compression

Axle Centerline at Max Sag

The ride height of the model

can be changed by mounting

the push rod in a different hole

in the lower suspension arm.

From the factory, the push rod

comes installed in the center

hole of the lower suspension

arm’s push rod mount. If the

push rod is mounted in the inner hole, the ride height of the vehicle

increases. If mounted in the outer hole, the ride height decreases.

The ride height can be finely tuned by adjusting the sag of the

suspension.

Do not attempt to make large changes to the ride height

by adjusting the spring pre-load on the shock bodies.

If suspension sag

is severe and requires a large increase of the spring pre-load to

compensate, then a firmer spring should be used. The lowest ride height

can be achieved by installing the optional adjustable push rod in the

outermost hole of the lower suspension arm’s push rod mount. Turn the

rod ends all the way in until they stop (shortening the length).

The optional Long Travel rocker arms are designed to be used only with

the standard non-adjustable push rods installed in the hole labeled “LT”

(the middle hole of the lower suspension arm’s push rod mount). Any

minor adjustments to the ride height are accomplished by adjusting the

spring pre-load.

Adjusting the Pivot Ball Caps

The pivot ball caps should be

adjusted so that the pivot balls

operate freely in the axle carriers with

no excess play. Use the provided four-

way suspension multi-tool to tighten

or loosen the pivot ball cap.

Shock Oil

The 4 oil-filled aluminum shocks (dampers) effectively control the

suspension movement by preventing the wheels and tires from

continuing to “bounce” after rebounding from a bump. Changing the oil

in the shocks can vary the suspension damping effect. Changing the oil to

a higher viscosity oil will increase damping. Lowering the viscosity of the

oil will cause the suspension damping to be reduced. Damping should be

increased (with higher viscosity oil) if the model is bottoming easily over

jumps. Damping should be decreased (with thinner viscosity oil) if the

model is hopping over small bumps and feels unstable. The viscosity

of shock oil is affected by extremes in operating temperature; an oil of

certain viscosity will become less viscous at higher temperatures and

more viscous at lower temperatures. Operating in regions with cold

temperatures may require lower viscosity oil. From the factory, the shocks

are filled with SAE-30W silicone oil. Only use 100% silicone oil in the shock.

For shock piston tuning see

Advanced Tuning Adjustments on page 44.

Replacing Shock Oil

The shocks have to be removed

from the vehicle and disassembled

to change the oil.

1. Remove the lower spring

retainer and shock spring.

2. Remove the upper shock cap

using the shock wrench and

the suspension multi tool

3. Empty the used shock oil from the shock body.

4. Fill the shock with new silicone shock oil up to the top of the

shock body.

5. Slowly move the piston up and down (always keeping it submerged in

oil) to release the air bubbles. Let the shock sit for a few minutes to

allow any remaining air bubbles to surface.

6. Slowly thread the upper cap with the installed shock bladder onto the

shock body with the suspension multi tool. The excess oil will bleed

out of the small hole in the shock cap.

7. Tighten the shock cap until snug. Use the included steel shock wrench

to hold onto shock body while tightening.

Revo 3.3

•

Basic Tuning Adjustments

Important: The shocks are

assembled at the factory

with a center-to-center

distance (between the

rod end balls) of 87mm.

Any time the shocks are

removed and disassembled,

this distance should be

checked to ensure

proper operation of

the suspension.

87mm

Increases

Ride Height

ecreases

Ride Height

•

Revo 3.3

Basic Tuning Adjustments

Alignment Settings

The alignment settings are critical for optimizing the performance of Revo.

Adjust your alignment as carefully and precisely as you possibly can.

Toe Adjustment

The wheels can be adjusted to point

straight ahead or have a toe-in or

toe-out setting. To help you

remember, look down at your feet.

For toe-in, your feet point towards

each other. For toe-out, your feet

point away from each other.

The toe angle of the front wheels can

be adjusted by varying the length of

the toe links that connect the

steering linkage to the front axle

carriers. The toe angle of the rear

wheels can be adjusted by varying

the length of the metal toe links that

connect the rear bulkheads to the

rear axle carriers. The front toe links

and rear toe links are equipped with

turnbuckles. The lengths of the toe

links can be adjusted by turning

them with the included 5mm Traxxas

wrench.

Toe Base Factory Settings

Front:

0-degrees

Rear: 1-degree toe-in each side

Under certain conditions, toe-in can be increased to a maximum of 3

degrees. To avoid potential interference of suspension components with

the long travel rockers installed, see the maximum alignment limits table

on page 37.

Static Camber Adjustment

The wheels can be set to have either

positive or negative camber (see illustration

below). The camber angle changes as the

wheel moves up and down through its

range of travel. Static camber is the camber

angle at the wheel when the vehicle is set at

its normal, stationary ride height.

The suspension pivot balls located in the

axle carriers adjust the static camber. The

pivot balls are protected by blue dust plugs. To adjust your static camber,

insert the supplied 2.5 mm hex wrench through the slit in the dust plug

and engage the end of the pivot ball (compressing the suspension until

the arms are parallel to the ground will allow for easier hex wrench

engagement). The upper pivot ball is normally screwed all

the way in. Negative camber is achieved by screwing the pivot ball of the

lower control arm out.

Note: When camber is changed, the toe angle of

the wheel has to be reset.

Static Camber Base Factory Settings

Front:

1-degree negative camber each side

Rear: 1-degree negative camber each side

For caster, roll center, and

optional rocker arm tuning

see

Advanced Tuning

Adjustments

on page 42.

Positive camber

Negative camber

All of the toe links are

installed on the truck so that

the left hand thread

indicators point to the same

direction. This makes it easier

to remember which way to

turn the wrench to increase

or decrease toe link length

(the direction is same at all

four corners). Note that the

groove in the hex indicates

the side of the toe link with

the left-hand threads.

Front of Truck

Left Front

Right Front

Left Hand Thread

Indicator

Left Hand Thread

Indicator

Left Hand

Threads

Right Hand

(Normal) Threads

Decrease

Length

Increase

Length

A camber gauge (available

at your local hobby shop)

can be a useful tool for

alignment setting.

Toe In

Configuration

Stock

Raised

Lowered

Long travel

Available

Camber

(degrees)

+3 to -5

+3 to -1

+3 to -5

+3 to -1

Available Toe

(degrees)

Toe Out

Maximum Alignment Limits (using stock push rod length)

Revo’s maximum toe and camber alignment settings can be limited by

the ride height setting. Do not exceed the maximum limits or you could

experience interference between suspension components. The ride

height is controlled by where the push rod is installed in the lower

suspension arm. First determine which of the following configurations

you are using:

a. Stock Configuration – When the pushrod is in the middle position of the

lower control arm.

b. Raised Configuration - When the pushrod is in the raised position to

increase the vehicle’s ride height (innermost hole in lower control arm).

c. Lowered Configuration - When the pushrod is in the lowered

position to decrease the vehicle’s ride height (outermost hole in

lower control arm).

d. Long Travel Configuration – When the pushrod is in the middle

position of the lower control arm with the Long Travel rockers installed.

Front Suspension

The following are suggested maximum settings for the front suspension

in order to avoid interference between suspension components:

Rear Suspension

The following are suggested maximum settings for the rear suspension

for all configurations. Toe out is not normally used on the rear of Revo.

Transmission Tuning

Adjusting the Slipper Clutch

Your Revo is equipped with an

adjustable Torque-Control

™

slipper

clutch. The slipper clutch is integrated

into the main spur gear on the

transmission (see page 6). The slipper

clutch is adjusted by loosening the

spring-loaded locknut on the slipper

shaft. Use the supplied 8mm open-end

metric wrench. To tighten or loosen the

slipper nut, insert the 2.0mm hex wrench into the hole in the end of the

slipper shaft. This locks the shaft for adjustments. Turn the adjustment

nut clockwise to tighten (less slippage) and counter-clockwise to loosen

(more slippage). The slipper clutch has two functions:

1. Limiting the engine’s torque output to the wheels to prevent

wheelspin on low traction surfaces and help to prevent damage

to the gears in the transmission during on-throttle landings.

2. Protecting the drivetrain from sudden impact or shock loads (such as

landing from a jump with the engine at full throttle).

From the factory the slipper clutch is set for minimal slippage, just

enough to protect the drivetrain from shock loads. On slippery, low

traction surfaces such as a hard-packed, dry racetrack you may benefit

from loosening the slipper adjustment nut to allow for more clutch

slippage. This will make the truck easier and more forgiving to drive by

helping to reduce the amount of wheel spin. Loosening the slipper

adjustment can also improve performance on extreme high traction

surfaces by preventing the front end from lifting off of the ground when

accelerating. Make slipper adjustments in small 1/8 turn increments.

The maximum tight setting for the slipper is just at the point where

there is little or no tire slippage on a high traction surface such as carpet

or a prepared racetrack. The slipper should not be tightened to the point

that clutch slippage is completely eliminated. Do not overtighten the

slipper nut or you could damage the slipper bearings, pressure plates, or

other components.

Revo 3.3

•

Basic Tuning Adjustments

Toe In

Configuration

All

Available

Camber

(degrees)

+3 to -5

Available Toe

(degrees)

Toe Out

Adjusting the Two-Speed Transmission

Revo comes equipped with an adjustable two-speed transmission. When

the shift point on the transmission is adjusted correctly, it will maximize

acceleration and improve drivability. Use a 2mm hex wrench

to adjust the shift point. To make the adjustment, the engine must be off

(not running).

1. Shift the transmission into forward gear

(shift button down).

2. Remove the rubber access plug from the

top of the transmission housing.

3. While looking through the opening,

rotate the spur gear to align the cutout

(notch) on the internal two-speed clutch

drum with the opening.

4. Hold the spur gear and slowly roll the

truck forward until the hex on the black

adjustment set screw becomes visible in

the opening.

Note: the truck will only roll

forward (not backwards) when the spur

gear is held stationary.

5. Insert the 2.0mm hex wrench

through the clutch drum and into

the adjustment screw.

6. Turn the adjustment screw 1/8 turn

counter clockwise to lower the shift

point (shifts sooner). Be careful not to

loosen the adjustment screw too much

or you may cause the screw and spring

to fall out (requiring major disassembly

and repair). Turn the adjustment screw

clockwise for later shifts.

7. Reinstall the rubber access plug to prevent dirt from entering the

transmission. Do not put oil or other lubricants into the transmission

through the two-speed adjustment access.

8. Check performance by running a test lap after each adjustment. On a

small race track with many tight turns, try setting the shift point later so

that the truck only shifts into second gear on the main straightaway. This

will prevent an unexpected shift in the middle of a turn. On larger tracks

it may be necessary to allow earlier shifts for increased speed.

Adjusting the Spur Gear/Clutch Bell Gear Mesh

The ideal spur gear/clutch bell gear mesh for

Revo is 0.1mm. To set the gear mesh, place a

strip of standard letter/A4 size copy or printer

paper (about 0.1mm thick) between the

mating teeth. Loosen the two horizontal

engine mount screws and slide the engine

mount up to push the clutch bell gear against

the spur gear so that the that the paper is not

too tight to pull out or too loose that it will fall

out. Tighten the two horizontal engine mount

screws securely. When the paper is removed,

you should feel only the slightest amount of

play between the gears (almost none) and

there should be no binding or friction.

Changing the Spur Gear

1. Remove the four cap head screws that

secure the engine to the engine mount.

2. Remove the button head screw that

secures the pipe hanger to the rear body

mount (see inset).

3. Carefully remove the engine and exhaust

system from the spur gear area to allow enough

room to remove the spur gear.

4. Remove the three screws on the slipper clutch

assembly using a 2.5mm hex wrench. Slide the

spur gear off of the slipper shaft. If the spur gear is

too tight on the shaft, gently pry on the back of

the gear with a flat screw driver to loosen it.

Repeat the above steps in reverse order to install the new spur gear.

Dual Servo Steering System

Revo uses dual-servo steering and a single heavy-duty servo saver for

powerful, responsive steering. To prevent unnecessary receiver battery

drain it is important to make sure that the servos are “at rest” when the

steering is at neutral. If one servo is out of adjustment, then both servos

will work against each other, fighting to find center.

Adjusting The Steering System

1. Remove the servo horns and steering links from the servos.

Disconnect the steering links from the servo saver.

•

Revo 3.3

Basic Tuning Adjustments

Shift

Sooner

Two Speed Adjustment

note: If the truck will not roll

forward while the spur gear

is held, the transmission

may still be in reverse gear.

For adjusting two-speed

and gear ratios see

Advanced Tuning

Adjustments

on page 44.

2. Adjust both the steering links to be the exact same length (31.7mm -

use “Steering Servo Horn Link Length Template” below to set length).

3. Switch on the power to the receiver and the transmitter.

4. Adjust the steering trim on the transmitter to the neutral “0” position.

5. Connect one end of a steering link to the steering servo saver arm and

the other end to the servo horn

6. Position the steering servo saver arm

perpendicular to the centerline of the vehicle.

7. While holding the steering servo saver arm in

the position mentioned in step 6, install the

servo horn onto the servo such that the

steering link is parallel with the centerline of

the vehicle. This will automatically set the

servo horn at the 7-degree offset shown in

the illustration.

8. Install the second servo horn on the other side

following the same procedure.

If necessary, fine-tune the length of the second steering link to eliminate

any load on the steering system in the neutral position.

If you are using aftermarket servos, it is important to use servo horns

designed for Revo. Optional steering servo horns are sold separately for

use with non-Traxxas servos.

Servo Saver Tuning

An optional stiffer spring is available for the servo saver when using servos

with metal gear sets (see parts list for details). Do not use this spring with

standard Traxxas high-torque servos.

Brake Setup & Adjustment

Revo is equipped with a disc brake that rides on the yoke of the

transmission’s front output shaft. The brake is preset at the factory and

should not require attention. As the brake material wears, future

adjustments may be necessary.

Brake Shoulder Screw Adjustment

The two shoulder bolts that are used to secure the brake pads to the

transmission housing may need to be adjusted periodically as the brake

material wears down. They should be

tightened so a 0.50mm (.020") gap

exists between the disk and the brake

pad (on the transmission side). Adjust

in one of the following ways:

1. Use a .50mm feeler gauge between

the brake pad insert and brake disk.

2. Push the outer brake pad firmly against the inner pad with your finger,

sandwiching the brake disk between the brake calipers. Tighten the

brake shoulder bolts until they just barely

touch the brake pads. Do not over tighten

these fasteners or you could damage the

brake calipers. Loosen each of the shoulder

bolts by 1 turn.

Brake Linkage Adjustment

When correctly adjusted, the brake linkage

spring should barely touch the rod guide

when the servo is in neutral position

(closed throttle). This will ensure no brake

drag during operation of the vehicle. The

brake adjustment knob can be threaded

away from the spring for less braking

power if desired. Do not adjust knob to

apply pressure against the spring while

the servo is in the neutral position. This

will induce brake drag and cause undesirable handling.

The position of the z-bend from the factory is in the middle position of the

servo horn. Changing this position will affect the way the brake force is

applied. The brake adjustment knob will need to be readjusted if this

position is changed.

Brake Pad Wear and Replacement

During normal use the brake pads should wear at a relatively slow rate.

However, if the brake pads wear down close to the metal pad holders, they

should be replaced. Any more wear than this could cause damage to the

brake parts and improper operation of the brake system.

Revo 3.3

•

Steering Link Length Template

61.7mm

0.5mm

gap

Less Brake

Front of Truck

Brake

Linkage

Spring

Basic Tuning Adjustments

•

Revo 3.3

Your Revo requires timely maintenance in order to stay in top running

condition.

Neglecting the maintenance could allow dirt, deposits, and

moisture to build up inside the engine leading to internal engine

failure.

The following procedures should be taken very seriously.

After each hour of running:

Clean and re-oil the air filter. The instructions for this procedure are on

page 23.

We cannot stress enough the value of cleaning your air

filter at the scheduled intervals.

The cleanliness and condition of your

air filter directly influences the running life span of your engine.

Do not

skip air filter maintenance!

Clean the outside of the engine of accumulated dirt, oil, and grime.

Accumulated grime will decrease the engine’s ability to cool itself.

To maintain optimum radio system performance, the RX Power Pack

(receiver battery) should be recharged after each hour of runtime.

Tighten the wheel nuts (especially on the left side). Use the 8mm end

of the included glow plug wrench.

After each running session:

Perform after-run maintenance on the engine. This clears the engine

of destructive moisture and other corrosive deposits.

This is extremely

important for the life of the engine. Read on for after-run

maintenance procedures.

Inspect the gears for wear, broken teeth, or debris lodged

between the teeth

nspect the vehicle for obvious damage or wear. Look for:

1. Loose or missing screws

2. Cracked, bent, or damaged parts

3. Cut or loose wiring

4. Cut or kinked fuel lines

5. Signs of fuel leakage

Other periodic maintenance:

Connecting rod: The connecting rod should be replaced when the

piston and sleeve are replaced. Also replace the piston wrist pin and

G-clip whenever the connecting rod is replaced. As with other

internal engine components, connecting rod life depends engine’s

usage and the quality and frequency of the engine maintenance.

Inspect the connecting rod after 3-gallons of fuel have been used.

Slipper clutch pads (friction

material): Under normal use, the

friction material in the slipper clutch

should wear very slowly. If the

thickness of any one of the slipper

clutch pads is 1.8mm or less, the

friction disc should be replaced.

Measure the pad thickness using calipers or measuring against the

diameter of the 1.5 and 2.0mm hex wrenches provided with the model.

Piston/sleeve: The life of the piston and sleeve will

vary greatly with how the engine was used and

maintained. The piston and sleeve should be

replaced when they no longer seal effectively (loss

of compression). Symptoms include the engine

being difficult to start when warm, stalling when

warm, and stalling when throttle is suddenly closed

to idle. Replace the wrist pin and G-clip whenever

the piston and sleeve are replaced.

RX Power Pack: Even though the highest quality

cells are used in the Traxxas RX Power Pack, over

time, use and charging will reduce the capacity and

overall runtime. Completely discharging the battery

and frequently “topping off” partially discharged

batteries contribute to reducing the battery pack’s

charge capacity. When the batteries run time

between charging is no longer acceptable,

the RX Power Pack should be replaced.

After-run Procedure

You must perform after-run maintenance on your Traxxas engine whenever

the model will be stored for longer than a few hours. Taking the time to

prepare your engine for storage will reward you with longer engine life,

easier starting, and better performance.

When a nitro engine is shut off, some excess unburned fuel remains in the

engine. The methanol in model engine fuel is hygroscopic, which means it

easily attracts and absorbs moisture. This moisture can cause rust and

corrosion on the steel engine parts (crankshaft, bearings, wrist pin and

starter shaft) if the fuel is not removed from the engine. There are after run

oil products available from your hobby dealer or you can use WD-40™,

Maintaining and Storing Your Revo

If the engine is worn or

damaged enough to require

replacing the piston, sleeve,

or connecting rod, consider

exchanging your old engine

for a brand new engine

under the terms of the

Traxxas Lifetime Engine

Replacement Plan (ERP). It

could save you time and

effort. Details are in your

model’s documentation

package.

The TRX 3.3 Racing Engine is

designed to be easy to

rebuild. Critical engine

components such as the

crankcase, crankshaft, and

engine bearings are made

to extremely high quality

standards and should under

normal circumstances

outlast multiple sets of

pistons, sleeves, connecting

rods, and wrist pins

(reciprocating assemblies).

It could be more economical

for you to continue to use

your good bearings and

crankshafts, and simply

replace the reciprocating

assembly as needed. Engine

assembly is not difficult and

replacing the reciprocating

assembly does not require

any special tools or skills.

Revo 3.3

•

a common household lubricant. To ensure your TRX 3.3 Racing Engine is

protected from internal corrosion, use the following procedure:

1. Whenever possible, shut off the engine by pinching the fuel line

closed. This allows most of the excess fuel to be consumed by the

engine. Be sure the throttle is in the idle position. You may have to

pinch the fuel line closed for several seconds before the engine stops.

2. Completely empty the fuel tank. Use your fuel-dispensing bottle to

suck out the old fuel. Do not mix the old fuel with your fresh fuel

supply. If you leave fuel in the tank, transporting or handling your

Revo may cause fuel to run into the engine.

3. With the fuel tank empty and the throttle at the idle position, try to

start the engine. The engine will most likely start and run for a few

seconds as it uses up any fuel remaining in the engine and fuel lines.

4. Once the engine stops, clean the outside of the engine with

compressed air or spray motor cleaner. Once the engine is clean and

dry, remove the glow plug power wire, glow plug, and air filter.

5. Open the throttle fully and spray a one-second burst of WD-40 into the

carburetor and into the glow plug hole (Caution! Wear safety glasses to

prevent spray from getting into your eyes). If you are using after-run

oil, follow the manufacturer’s instructions.

6. Place a rag or paper towel over the engine to catch any WD-40 or after-

run oil that may come out the carburetor or glow plug hole.

7. Connect the EZ-Start controller to the model and spin the engine for

10 seconds.

8. Remove the rag or paper towel and repeat steps 5–7 two more times.

9. Clean and re-oil the air filter so it will be ready for use next time. See

page 23 for air filter maintenance instructions.

10. Replace the glow plug, reconnect the glow plug power wire, and

reinstall the air filter.

Clearing a Flooded Engine

If the engine is primed for too long during startup, then it can become

flooded with fuel. When the engine is flooded it will no longer turn due to

excess fuel in the combustion chamber preventing upward movement of

the piston. Use the following procedure to clear a flooded engine:

1. Remove the blue glow plug wire.

2. Remove the glow plug and gasket with the glow plug wrench supplied

with your model. A 5/16 or 8mm nut driver will also work.

3. Turn the model upside down and plug in the EZ-Start controller.

4. Push the EZ-Start button for several seconds to clear the engine

of excess fuel. Do not look into the glow plug hole while the

engine is spinning or you could spray fuel into your face!

5. Turn the model over and reinstall the glow plug and gasket.

6. Reconnect the blue glow plug wire to the glow plug.

7. Reconnect the EZ-Start controller.

8. Do not prime the engine. Pull the throttle to 1/2 throttle and push the

EZ-Start button. The engine should start immediately.

Piston stuck at “top dead center” (TDC)

“Top dead center” is the position where the piston is

at the very top of the tapered sleeve. Occasionally an

engine can get “stuck” at this position. This is most

likely to happen on new engines during break-in, but

can also happen at other times. If the engine is stuck

at TDC, use the following procedure to release the

piston from the sleeve:

1. Remove the glow plug using the included tool or

8mm (5/16") nut driver and verify that the piston

is at the top of its stroke.

2. Turn the Revo over and locate the flywheel through

the cutout in the chassis. Insert a flat blade

screwdriver as shown between the chassis and

flywheel. Using the chassis for leverage, rotate the

flywheel counterclockwise by pressing down on

the screwdriver. The flywheel will turn, unsticking

the piston from the sleeve.

3. Put two or three drops of light machine oil into

the glow plug hole to lubricate the piston and

sleeve. Do not use too much oil. It will hydro-lock

the engine. Verify the starter will spin the engine

with the glow plug out.

4. Rotate the flywheel so the piston is at bottom

dead center and replace the glow plug with

gasket. Reconnect the blue glow plug wire.

5. You should now be able to start the engine with the EZ-Start.

Denatured alcohol

(available from home

centers and paint supply

stores) in a spray bottle is

an extremely effective

cleaner. Be sure to wear

safety glasses and gloves

when working with

denatured alcohol.

Be sure to follow proper

maintenance and storage

procedures to avoid

damage to your engine

and other components of

your Revo.

Don’t put the fuel from

your tank back into your

fuel jug. Dispose of it

properly, following city or

county regulations.

Always wear eye

protection when using

compressed air or spray

cleaners and lubricants.

Maintaining and Storing Your Revo

Top Dead Center

Bottom Dead Center

•

Revo 3.3

This advanced tuning guide will take you one step further into the cutting

edge technology that has been designed into Revo. Follow the instructions

provided here to take advantage of Revo’s maximum performance

potential.

Suspension and Alignment Settings

Caster Adjustment

The caster angle of the front

suspension may be used to adjust the

understeer (push)/oversteer handling

characteristics of the model.

Generally, increasing the caster angle

will move the truck towards an

oversteer condition (more traction on

the front tires, less on the rear tires).

Decreasing the caster angle will

create a tendency towards understeer

(pushing in the turns). From the

factory, the front suspension is set to

a caster angle of 10-degrees. The rear

caster angle is not adjustable. The

caster angle of the front suspension can be adjusted from 5° to 15°. Adjust

the caster by positioning the caster adjustment shims on the upper control

arms of the front suspension as shown in the table below:

Caster Angle, and Bump Steer

Bump steer is unwanted change in the steering angle of the front wheels

as the suspension travels up and down. It can result in unstable and

unpredictable handling. Bump steer is affected by the position of the outer

toe link end on the axle carrier. From the factory, the toe links are positioned

so that bump steer is virtually eliminated (about 3/100 of a degree through

the entire range of travel). When the caster angle is changed, the outer toe

link end should be repositioned on the axle carrier to maintain zero bump

steer geometry. Adjustment is achieved using the shims and hollow balls

provided with the vehicle. Refer to the Bump Steer Elimination chart on

page 43, and look up your caster angle setting to find the correct position

for the outer toe links. Positioning the toe-links correctly will maintain the

original factory geometry and eliminate the unwanted steering angle

changes caused by bump steer.

Roll Center

There are two holes on the bulkheads

to mount each upper suspension arm.

The roll center of the vehicle can be

raised by mounting the upper control

arm in the lower of the two holes. This

will effectively increase the roll stiffness

of the vehicle (similar to installing

swaybars). Adding roll resistance to

one end of the vehicle will tend to add traction to the opposite end. For

example, increasing roll resistance in the rear by installing the upper arms

in the lower holes will provide more traction for the front wheels and

potentially more steering. Installing the upper arms in the lower holes on

the front and rear will increase overall roll resistance without changing the

handling balance. The arms are installed in the upper position from the

factory to make the truck easier and more forgiving to drive and less likely

to traction roll in turns. The lower holes should be reserved for track tuning.

Note: When the upper suspension arms are moved to the lower holes,

the front outer toe link ends and the rear toe control links should be

repositioned to eliminate bump steer. Refer to the Bump Steer Elimination

chart on page 43, and look up your suspension combination (caster angle

and roll center position) to find the correct position for the front outer toe

links and the rear toe control links. Adjustment is achieved using the shims

and hollow balls provided with the vehicle.

Rockers (Progressive Rate/ Suspension Travel)

One of the most exciting aspects of Revo’s suspension is the inboard shock

(damper) arrangement that uses pivoting rockers to translate vertical wheel

travel into linear shock motion. The rockers can be changed to increase or

decrease the maximum wheel travel and also to change the progressive

rate of the suspension.

The progressive rate determines how much the force at the wheel

produced by the springs being compressed (wheel force) will vary with

suspension travel (or vertical travel of the wheel). On a progressive

suspension arrangement, the wheel force will increase at a faster and faster

rate as the suspension is compressed. It feels as though the shock spring

gets progressively stiffer the more you compress the suspension. On a

linear suspension arrangement, the wheel force increases linearly as the

Caster

5.0°

7.5°

10.0°

12.5°

15.0°

In Front of

Hinge Pin Boss

None

One

Two

Three

Four

Behind

Hinge Pin Boss

Four

Three

Two

One

None

Number and Position of Caster

Adjustment Shims (Front Upper Control Arm)

Caster adjustment shims (2 front, 2 rear)

Vertical

Ground plane

10°

Upper Control Arm

Upper Mounting Holes

Upper Control Arm

Lower Mounting Holes

Upper Control Arm

Upper Mounting Holes

Upper Control Arm

Lower Mounting Holes

Advanced Tuning adjustments

suspension is compressed. The spring does not feel any stiffer, even when

the suspension is fully compressed. This provides a very “plush” feeling

suspension with seemingly bottomless suspension travel.

A total of four different rocker arm sets are available for Revo. All rocker

arms except the Long Travel rocker arms will allow the wheel to travel a

total of 90mm in the vertical direction. From the ride height position, the

wheel will be able to travel 60mm in the upward direction (bump), and

30mm in the downward direction (droop). The Long Travel rocker arm

increases total travel to 120mm. The progressive rate can be increased or

decreased by installing different rocker arm sets. The rockers are labeled

Progressive 1 to Progressive 3. Progressive 1 rockers will provide a low

progressive rate that maintains consistent damping force across through

the whole range of suspension travel. These are best for extremely rough

terrain that requires maximum suspension articulation. Progressive 3

rockers use high progressive rate that will improve high-speed cornering

on smooth surfaces by providing a firmer feel. Body roll, brake dive and rear

squat will also be reduced. Always change all four rockers as a complete set.

Do not mix rates and travel.

Using rockers with lower progressive rate may require the use of stiffer

springs to maintain proper spring pre-load and ride height. The spring

pre-load adjuster on each shock is designed for minor adjustments. If the

adjuster needs to be turned all the way down (compressing the spring) in

order to maintain proper ride height, then the next stiffer spring should

be used.

The chart below demonstrate the effect of the various rocker arms on

wheel force as the suspension is compressed. On the progressive rate,

wheel force is light at first and increases as the suspension is compressed.

Bump Steer Elimination Chart

The illustrations and the following table detail the position of the outer toe

link end for various caster and roll center settings to eliminate bump steer.

The shims and the hollow balls used to adjust bump steer are provided

with your vehicle.

Front

Rear

When the rear upper control arms

are mounted in the lower of its two

mounting holes in the bulkhead (roll

center), the tall hollow ball should be

used as shown.

Revo 3.3

•

Rocker Arm

Progressive 1

Progressive 2

(installed)

Progressive 3

Long Travel

(

included)

Total Travel

90mm

(60mm up/30mm down)

90mm

(60mm up/30mm down)

90mm

(60mm up/30mm down)

120mm

(80mm up/40mm down)

Progressive Rate

Low

Medium

High

Low

Outer Toe Link End Setup

Caster

5° 7.5° 10° 12.5° 15°

Control Arm

Mounting Hole on

Front Bulkhead

Upper

Lower

Upper

Lower

Upper

Lower

Upper

Lower

Upper

Standard

Hollow Ball

Thin Shim

Thick Shim

Thin Shim

Standard

Hollow Ball

Thick Shim

Tall Center

Hollow Ball

Thick Shim

Standard

Hollow Ball

Thin Shim

Thick Shim

Thin Shim

Standard

Hollow Ball

Advanced Tuning Adjustments

When using Long Travel

rockers, A correspondingly

thicker shock oil (or pistons

with smaller diameter

bypass holes) should also

be used to ensure a proper

relationship between the

spring and damping forces.

Constant Rate Travel

Wheel Force

10 20 30 40 50 60 70 80 90

Progressive Rate Travel

Tall Center

Hollow Ball

Shock Tuning

Shock Pistons

The shock pistons can be replaced with

the available optional pistons to vary

the amount of damping. Optional

pistons with bypass holes that are

larger or smaller (1, 2, or 3) than the

factory installed stock pistons can be

used to decrease or increase damping

respectively. Change the pistons if you

only have one weight of shock oil

available to you. From the factory, Revo

is equipped with #1 pistons in the front

and #2 pistons in the rear.

Shock disassembly

The shocks must be removed from

the vehicle and disassembled to

change the pistons. Use the shock

exploded views included with the

model to aid in the assembly process.

1. Remove the spring and lower

spring retainer from the shock.

2. Remove the shock cap (A) and

empty the shock body of shock oil.

3. Remove the lower cap (B) and

the X-ring from the shock body.

4. Use side cutters to grip the shock

shaft just above the rod end (C).

Remove the rod end from the shock

shaft using the suspension multi tool (C).

5. Remove the shock shaft with piston from the shock body out through

the top of the shock body.

Shock assembly

1. Replace the stock piston with desired optional

piston. Be careful not to lose the small washer

located below the piston.

2. Position the new piston onto the shock shaft

above the small washer. Grip the threads of

the shaft with side cutters or needlenose pliers

and tighten the nut with the 4-way wrench to secure the assembly.

3. Insert the shock shaft assembly through the shock body until the

piston bottoms out.

4. Lubricate the shaft and X-ring with silicone oil.

5. Install the X-ring over the shaft and into the bore of the shock body.

6. Install the lower cap using the suspension multi tool (B).

7. Slide the bump stop onto the shaft.

8. Grip the shaft close to the threads with needle nose pliers or side

cutters and thread the rod end onto the shock shaft until the rod end

bottoms out (C).

9. Fill the shock with new silicone shock oil up to the top of the

shock body. Slowly move the piston up and down (always keeping it

submerged in oil) to release the air bubbles. Let the shock sit for a

few minutes to allow any remaining air bubbles to surface.

10. Slowly thread the upper cap with the installed shock bladder onto the

shock body with the suspension multi tool (A). The excess oil will bleed

out of the small hole in the shock cap. Tighten the shock cap until

snug. Use the included steel shock wrench to hold onto shock body

while tightening.

11. Reinstall the spring and lower retainer.

Transmission and Differential tuning

Adjusting the Gear Ratio

The gear ratio on Revo can be adjusted for different conditions that may

require either increased acceleration or increased top speed. Adjusting the

gear ratio is accomplished by changing the clutch bell on the engine

and/or the spur gear (slipper clutch gear) on the transmission. From the

factory, Revo is equipped with a 15-tooth clutch bell and a 38-tooth spur

gear. This combination will provide a good balance of acceleration and top

speed. Optional spur gears and clutch bell gears are listed on your parts

list. Refer to the chart on page 45 for possible gearing combinations

Adjusting the Two-Speed Ratios

Revo is equipped to allow adjustment to the two-speed by installing

optional close and wide-ratio gearsets. This requires transmission removal

and disassembly (see www.Traxxas.com for detailed instructions). The close

ratio gearsets will reduce top speed slightly but will provide more powerful

acceleration by reducing engine rpm loss when shifting from 1st gear to

2nd gear. The wide ratio gear set is installed in the Revo 3.3. The additional

horsepower and torque output of the TRX 3.3 engine provides seamless

shifting even with the larger gap between first and second gears.

•

Revo 3.3

Advanced Tuning Adjustments

A. Tighten/Loosen Upper Cap

C. Remove/Install Rod End

B. Tighten/Loosen Lower Cap

Multi-tool Shock Functions

Shock Piston Hole Sizes

Piston 1: 1.10 mm

Piston 2: 1.00 mm

Piston 3: 0.95 mm

Never slide the threads on

the shock rod past the

X-ring seal when it is

installed and compressed

by the bottom cap of the

shock. Doing so will

damage the seal and cause

shock oil to leak.

Piston Installation/Removal

The following gear ratio chart shows the available combinations with

optional spur gears, clutch bells, and two-speed gear sets.

Tuning The Sealed Gear Differentials

Revo’s front and rear gear differentials allow the left and right wheels to spin

at different speeds while turning so that the tires do not scuff or skid. This

decreases the turning radius and increases steering performance.

The performance of the differentials can be tuned for different driving

conditions and performance requirements. The differentials are filled with

silicone differential fluid, and are sealed to maintain consistent long-term

performance. Changing the oil in the differential with either lower or higher

viscosity oil will vary the performance characteristics of the differentials.

Changing to a higher viscosity oil in the differential will reduce the tendency

for engine power to be transferred to the wheel with the least traction. You

may notice this when making sharp turns on slick surfaces. The unloaded

wheels on the inside of the turn have the least traction and tend to spin up

to extremely high rpms. Higher viscosity (thicker) oil causes the differential to

act like a limited-slip differential, distributing more equal power to the left

and right wheels. Revo will generally benefit from higher viscosity oil when

climbing, rock crawling, or racing on low traction surfaces.

Note: Heavier oil will allow power to be transferred even with one or more

tires off the ground. This can make the vehicle more likely to overturn.

From the factory, both the differentials are filled with SAE 30,000W viscosity

silicone oil. Only use silicone oil in the differentials. Traxxas sells SAE 10,000W

and SAE 50,000W viscosity oil (see your parts list). The differentials have to be

removed from the vehicle and disassembled to change/replace oil.

Installing the Long Travel Rockers

Use the exploded views included with the model to aid in the installation

process. All of the rockers have labels identifying their proper location; RF

(right front), LF (left front), RR (right rear), and LR (left rear).

Note: The

exhaust system must be removed to access the rear rocker arms.

1. Remove shock absorbers

Remove the screws that secure the shocks to the chassis shock mounts,

and to the rocker arms.

2. Install long travel shock springs

Replace all four of the 90mm travel shock springs with the four 120mm

long travel shock springs. The front shock springs are indicated by a silver

dot, and the rear shock springs are indicated by a blue dot.

3. Install long travel rockers

Replace the 90mm travel rockers with the long travel rockers by removing

the four 4x6 buttonhead cap screws from the rocker pivot posts. Remove

the 5x11 ball bearings from the rockers. Install the same 5x11 ball bearings

in the long travel rockers. Secure the long travel rockers to the pivots with

the same 4x6 buttonhead cap screws.

4. Locate push rods

Make sure that all four of the suspension push rods are located

and secured into the middle position (marked LT) on the lower

suspension arms.

5. Reinstall shock absorbers

Reinstall all four shock absorbers back into their respective locations.

Revo 3.3

•

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

21.18

14.69

21.18

16.01

21.18

13.52

22.36

15.51

22.36

16.90

22.36

14.27

# of Spur Gear Teeth

With 16T Clutch Bell

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

24.21

16.79

24.21

18.30

24.21

15.45

25.55

17.72

25.55

19.31

25.55

16.31

# of Spur Gear Teeth

With 14T Clutch Bell

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

(Wide)

Gear

1st

2nd

1st

2nd

1st

2nd

22.59

15.67

22.59

17.08

22.59

14.42

# of Spur Gear Teeth

With 15T Clutch Bell

(Standard)

23.54

16.32

23.54

17.79

23.54

15.02

26.90

18.66

26.90

20.33

26.90

17.17

25.10

17.41

25.10

18.97

25.10

16.02

Advanced Tuning Adjustments

Use higher viscosity

(thicker) oil for:

More power to the wheels

with the most traction.

Racing on low-traction

smooth surfaces .

Better performance for

climbing on uneven terrain.

Using lower viscosity

(thinner) oil for:

More power to the wheels

with least traction.

Racing on low-traction

rough surfaces.

2nd gear sets

17T/39T

(Standard)

16T/40T

(Close)

18T/38T

ide)

Gear

1st

2nd

1st

2nd

1st

2nd

19.94

13.83

19.94

15.07

19.94

12.72

21.04

14.60

21.04

15.90

21.04

13.43

# of Spur Gear Teeth

With 17T Clutch Bell

22.15

15.36

22.15

16.74

22.15

14.14

*stock configuration out of the box

23.85

16.54

23.85

18.03

23.85*

15.22*

•

Revo 3.3

Index

ABC, 20

After-run procedure, 40

Air density, 31

Air filter, 6, 19, 20, 23, 33

cleaning, 23

foam, 20

Air intake, 19

Air/fuel mixture, 24

Air/fuel ratio, 24

Airflow, 33

Alignment, 36

bump steer, 42, 43

caster, 42

caster angle, 42

configurations, 37

maximum limits,37

negative camber, 36

positive camber, 36

roll center, 42

settings, 36

static camber, 36

toe, 36

Altitude, 29

Ambient temperature, 32

Antenna (receiver), 7, 9, 13

mount, 6

Antenna (transmitter), 9, 17

Atmospheric conditions, 24, 32

Axle carrier, 6

Axle pins, 8

Barometric pressure, 32

Baseline setting, 32

Batteries, 11, 16

alkaline, 5

care, 12

charging,11, 12

compartment, 9, 11

mAh, 10

NiCad (nickel-cadmium), 10, 11

NiMH (nickel-metal hydride),10, 11

receiver, 12

RX pack (5-cell pack), 5, 10

transmitter, 11

BDC (Bottom Dead Center), 20, 41

Body mount, 6

Brake, 6

adjustment, 39

linkage adjustment, 39

pad wear and replacement,39

shoulder screw adjustment, 39

tension adjuster, 6

Break-in, 20, 28

starting, 28

Tank 1, 29

Tank 2, 29

Tank 3, 29

Tank 4, 29

Tank 5, 29

Tank 6, 29

winter, 30

Bulkhead, 6

Bumper, 6

Bumper Mount, 6

Carburetor (carb), 19, 20, 24

adjustments, 24

fine-tuning, 32

slide carburetor, 21

venturi, 24

Channel, 9, 10, 16

Channel number, 10

Charger, 26

Charging jack, see also Batteries;

charging, 6, 12

Chassis, 6

Clean-out, 20

Clearing your frequency, 10

Clutch bell, 19, 45

mesh, 38

Combustion chamber, 20

Connecting rod, 20

maintenance, 40

Cooling fins, 20

Crankcase, 19, 20

Crankshaft, 19, 20

Crashing,

Crystal (X-tal), 10, 16

Customer service, 3

Cylinder sealing, 28

Dampers (shocks), 6

center-to-center distance, 35

damper oil, 35

pistons, 44

pre-load adjuster, 6

replacing oil, 35

Decals, 8

Differential, 6

oil, 45

tuning, 45

Drivetrain friction, 33

Driving, 33

tips, 33

Dyno, 20

E-mail, 3

Engine, TRX 3.3

clearing a flood, 41

cooling, 33

cutting out, 30

detonation, 31

hesitation, 31

high altitude operation, 29

lubrication,

22, 25, 32

overheating, 30, 31

priming, 21, 28

revving, 33

shut-off clamp, 6, 19, 27

sluggish, 29, 31

stalling, 28, 31, 40

starting, 27, 28

temperature, 28, 30, 32

terms, 20

tuning, 30

tuning by temperature, 32

Exhaust, 19

EZ-Start, 19, 20, 26

battery, 26, 27

controller, 19

Cush Drive™, 26

drive unit, 19

Glow Plug LED, 27

motor, 6,

Motor LED, 27

plug, 6, 19

glow plug wire, 19

ground wire,19

negative wire, 19

positive wire, 19

protection mode, 27

Smart Start™, 26

using, 27

Fit, 20

Flag color,

Flame-out, 20

Flipping,

Flywheel, 19

Frequency band, 10

Fuel (Top Fuel), 5, 20, 22, 41

break-in, 28

dispensing bottle, 5

flow, 22, 24

handling, 22

other fuels,

unburned, 27, 40

Revo 3.3

•

Fuel cap, 6

Fuel intake, 19

Fuel line (fuel tubing), 6,

19, 20

Fuel mixture, 20, 24

Fuel tank, 6,

filling, 23

Gear ratio, 44

Glow plug, 20

driver, 21

glow plug wire, 19

Half shaft, 6

Head (cylinder head), 19, 20

Head protector, 19

Header, 6, 21

High-speed needle, 19, 21

adjustment,31

Humidity, 31

Idle speed screw, 19, 21, 25

adjustment, 32

Jumping, 33

Lean, 21

leaning the mixture, 21

maximum safe lean setting,

Low-speed needle, 19, 21

adjustment, 31

Maintenance, 40

Moisture,

Multi-tool, 5, 35, 44

Needle valve, 21

Neutral position, 10

Nitromethane (Nitro), 21

content, 21

percentage, 22

O-ring, 21

Obstacles,

On/Off switch (receiver), 6, 9, 16

OptiDrive, 6, 10

programming,15

Pinch test, 31

Pipe, 6, 19, 21

Pipe hanger, 6

Piston, 21

maintenance, 40

stuck at “top dead center”, 41

Pivot balls, 6

adjusting pivot ball caps, 35

Port, 21

Pressure line, 6, 19

Punch, 21

Push rods, 6

Quick Start, 7, 8, 11, 12, 13, 16, 17,

22, 26, 27, 28, 30, 33, 40

Radio interference, 4

Radio system, 9

adjustments, 14

controls,14

range-testing, 17

rules, 16

terminology, 10

Range, 13, 16

Receiver, 6, 9, 10, 16

Required equipment, 5

Reverse,

17, 33

Rich, 21

Ride height, 34

Rockers, 6, 42

installing, 45

Roll hoop, 6

Rollover,

rpm, 21

RX Pack, 10

Safety, 4, 8, 41

Servo chart, 15

Servo reversing switches, 9, 15

Servo Saver, 39

Shift button, 9

Shift rod, 6

Shifting servo, 6, 9, 10, 17

Shipping, 3

Skid plate, 6

Sleeve, 21

maintenance, 40

Slipper clutch, 6

adjusting, 37

pads, 40

Smoke, 30

Spur gear, 6, 45

changing, 38

mesh, 38

Stall, 21

Steering servo(s), 6, 9, 10, 17, 38

Steering system, 38

adjusting, 38

servo horn link, 39

Steering trim, 9, 10, 14

Steering wheel, 9

Storage, 40

Supplies, 5

Support, 3

Suspension, 34

maximum limits, 37

ride height, 35

rockers,42

springs, 34

total travel, 43

tuning, 34

Suspension arm, 6

TDC (Top Dead Center), 21, 41

Temperature gauge, 32

Throttle arm, 19

Throttle neutral adjust, 9, 14

Throttle trigger, 9

Throttle trim, 9, 10, 14, 17

Throttle/brake servo, 6, 9, 17

Tire gluing, 8

Tools, 5

Transmission, 6, 17

basic tuning, 37

gear ratio, 44

two-speed access plug,

two-speed adjustment, 38

two-speed ratio,44

Transmitter, 9, 10, 11, 14, 16, 17, 33

power indicator,9, 11

power switch, 9

Traxxas Lifetime Engine

Replacement Plan, 40

Trim, see also Throttle trim,

Steering trim, 10

Tuning adjustments, 34

Advanced, 42

Basic, 34

Turn, 24

Turnbuckle, 6

Two-speed, see Transmission, 38

Wear-in, 21

Weather conditions, 32

Wheelies, 33

Wheels, 8

Wiring Diagram, 9

WOT, 21

Y Adapter, 10

Index

owners manual

00 Klein Road, Plano Texas 75074

1-888-TRAXXAS

060105

MODEL 5309