Traxxas 1/16 Slash VXL 4x4 7009 Owner's Manual page 23

TRANSMISSION TUNING
Adjusting the Slipper Clutch
Your model is equipped with an
adjustable Torque Control slipper
clutch which is built into the large
spur gear. The purpose of the
slipper clutch is to prevent over-
stressing of the drivetrain and
transmission gears. It may also be
used to regulate the amount of power sent to the rear wheels to
prevent tire spin. When it slips, the slipper clutch makes a high-
pitch, whining noise.
To adjust the slipper clutch, remove the receiver box cover.
The slipper clutch is integrated into the main spur gear on the
transmission. The slipper clutch is adjusted using the spring-
loaded locknut on the slipper shaft. Use the supplied universal
wrench. To tighten or loosen the slipper nut, insert the 1.5mm
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).
Tuning the Sealed Gear Differentials
You model is equipped with sealed, bevel gear differentials. The
differentials allow the left and right wheels to spin at different
speeds while turning. You can increase or decrease the torque
transmitted between the left and right wheels by changing the
viscosity of the silicone oil inside the differentials. The viscocity
of the oil is indicated as a weight (W). Higher weights are more
viscous, meaning the oil is "thicker." Lower weight numbers are
less viscous, meaning the oil is "thinner." Filling the differential
with higher viscosity (thicker) oil "tightens" the differential,
transferring more power to the wheel with the most traction.
Filling the differentials with lower viscosity (thinner) oil "loosens"
the differential, transferring less power to the wheel with the
most traction. Traxxas sells a variety of differential tuning oils
specifically designed for use in your model.
Your model's gear differentials have been tuned specifically to
provide balanced handling and precision power slides. The front
differential has been filled from the factory with high-viscosity
50,000W silicone oil. The 50,000W oil allows the front wheels to pull
the model through the turn when counter steering through a drift.
Increasing the fluid viscosity increases the authority of the steering
while drifting, but decreases the steering when not drifting ("grip
driving"). Increasing the front differential viscosity too much will
make the model difficult to drive ("twitchy"). Decreasing the front
differential viscosity will decrease the ability of the model to drift,
but will increase steering response when grip driving.
Front Differential oil viscosity tuning suggestions
• For drift cornering with a single Series 1 battery (6-cell
NiMH), use the stock differential oil.
• For drift cornering with dual Series 1 batteries (12-cell
NiMH), use thicker/higher viscosity differential oil (higher
weight number).
• For grip driving with single or dual batteries, use thinner/
lower viscosity differential oil (lower weight number).
Tuning the rear differential fluid will allow you to fine tune the
amount of angle the model will exhibit during a drift. The rear
differential is filled with 30,000W oil to keep the rear of the
model from sliding out completely when drifting around a turn.
Increasing the viscosity of the fluid will cause the model to over-
rotate resulting in a spin. Decreasing the viscosity of the fluid
will reduce the model's drift angle. For grip driving, lowering the
viscosity will allow the model to turn more easily.
Rear Differential oil viscosity tuning suggestions
• For drift cornering with a single Series 1 battery (6-cell
NiMH), use the stock differential oil.
• For drift cornering with dual Series 1 batteries (12-cell
NiMH), use thicker/higher viscosity differential oil (higher
weight number).
• For grip driving with single or dual batteries, use thinner/
lower viscosity differential oil (lower weight number).
TUNING ADJUSTMENTS
1/16th SLASH VXL • 23