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SLAYER PRO 4X4 • 27

THE TRX 3.3 RACING ENGINE

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. Always use the idle speed adjustment screw to control
engine idle.

1. When the throttle servo is in its neutral position, the throttle slide
should be stopped against the idle speed 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.

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 20 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.

Содержание Slayer Pro 4x4 59074

Страница 1: ...owner s manual MODEL 59074...

Страница 2: ...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 cou...

Страница 3: ...h your question at support Traxxas com Join thousands of registered members in our online community at Traxxas com Traxxas offers a full service on site repair facility to handle any of your Traxxas s...

Страница 4: ...xposure to the engine exhaust can be harmful Avoid breathing the engine exhaust Always run your Slayer outdoors in a well ventilated area Never run the engine indoors Do not operate your Slayer at nig...

Страница 5: ...ies on page 10 Supplied Tools and Equipment Required Tools and Equipment sold separately Glow plug wrench Extra glow plug 1 5mm L wrench 2 0mm T wrench 2 5mm T wrench Shock wrench Suspension multi too...

Страница 6: ...e Fuel Line EZ Start Motor Bulkhead under chassis Body Mount Post Chassis Driveshaft Half Shaft On Off Switch Throttle Linkage to Throttle Brake Servo below filter Antenna Mount Access Plug for two sp...

Страница 7: ...rocedure for your TRX 3 3 5 Decal and Install the body See page 12 14 Break in your engine See page 23 You will need to use the body during break in so it s best to apply any additional decals before...

Страница 8: ...tion 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 han...

Страница 9: ...nd channel two operates the throttle The receiver inside the model has three output channels Your model is equipped with two servos and a receiver Slayer Pro 4x4 Wiring Diagram Antenna On Off Switch R...

Страница 10: ...rol of your model it is important to stop at the first sign of weak receiver batteries to avoid losing control Visible warning signals include sluggish steering response and shortened radio range Inst...

Страница 11: ...ur transmitter was not programmed properly at the factory Do not reverse the throttle or steering channels unless necessary Steering reversing procedure 1 Press and hold the SET button on the transmit...

Страница 12: ...ntil 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 mod...

Страница 13: ...wire against the chassis Do not bend or kink the antenna wire Do not shorten the antenna tube See the side bar for more information Fail Safe Your Traxxas radio system is equipped with a built in fail...

Страница 14: ...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 a...

Страница 15: ...Carburetor Air Intake Fuel Intake High Speed Needle Idle Speed Screw Clutch Bell Crankcase Two Stage Air Filter Glow Plug EZ Start Plug Positive Wire Negative Wire Fuel Line Fuel Tank Tuned Pipe Heade...

Страница 16: ...e 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...

Страница 17: ...s the first level of air filtration for the engine The majority of dirt and debris will be stopped by this filter Clean re oil and replace this filter after every hour of run time Always use both the...

Страница 18: ...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 smoo...

Страница 19: ...t Do not pull straight up 2 Remove the pre filter element 3 Clean the pre filter element by thoroughly washing the foam element in hot soapy water dishwashing detergent works well Repeat twice 4 Thoro...

Страница 20: ...vailable 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...

Страница 21: ...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 The engine glow plug is heated automaticall...

Страница 22: ...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 pi...

Страница 23: ...r 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...

Страница 24: ...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 1 Driving procedure Gently pull the throttle trigger to fu...

Страница 25: ...ds then it is likely that it is over 220 F 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 engi...

Страница 26: ...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 l...

Страница 27: ...nfluence 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 ea...

Страница 28: ...hing with your Slayer Pro 4x4 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 yo...

Страница 29: ...x4 is lightened significantly for racing applications softer springs will be necessary to allow the suspension to sag properly Heavier configurations will require stiffer springs The suspension sag an...

Страница 30: ...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 rel...

Страница 31: ...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 t...

Страница 32: ...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 un...

Страница 33: ...oulder 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 exist...

Страница 34: ...ld 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...

Страница 35: ...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...

Страница 36: ...ration Refer to the chart on page 37 for proper settings Stock the Slayer Pro 4x4 is setup to increase rear toe in during acceleration Note that rear toe out is not used Rockers Progressive Rate Suspe...

Страница 37: ...d look up your suspension combination caster angle and roll center position to find the correct position for the front outer toe links The same is required for the rear control links Adjustment is ach...

Страница 38: ...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 differenti...

Страница 39: ...spension 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 b...

Страница 40: ...121204 KC1754 R01 1100 Klein Road Plano Texas 75074 1 888 TRAXXAS MODEL 59074 owner s manual...

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