User Manual

38
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SLAYER PRO 4X4
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.
REAR
The illustrations and the following table detail the position of the outer
toe link end for the rear suspension. Depending on the upper control arm
mounting hole in the bulkhead (roll center) and desired toe-in effects, the
following settings should be used.
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.
From the factory, the front arms are installed in the upper position and
the rear arms are installed in the lower position. This makes the truck
easier and more forgiving to drive. The other holes should be reserved
for track tuning. Note: When the front upper suspension arms are moved
to a different hole, the outer toe link ends should be repositioned to
eliminate bump steer. Refer to the Bump Steer Elimination chart on page
38 and 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 achieved using the
shims and hollow balls provided with the vehicle.
TRANSMISSION AND DIFFERENTIAL TUNING
Adjusting the Gear Ratio
The gear ratio on Slayer Pro 4x4 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, Slayer Pro 4x4 is equipped with a 15-tooth clutch bell and a 36-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 sidebar chart for possible gearing combinations.
Adjusting the Two-Speed Ratios
Slayer Pro 4x4 is equipped to allow adjustment to the two-speed by installing
optional close and wide-ratio gearsets. This requires transmission removal
and disassembly (see 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 Slayer Pro 4x4. 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.
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
FRONT
Upper Control Arm
Upper Mounting Holes
Upper Control Arm
Lower Mounting Holes
ADVANCED TUNING ADJUSTMENTS
*stock configuration out of the box
With 14T Clutch Bell
# of Spur Gear Teeth
2nd gear sets Gear 36 38 40
17T/37T 1st 16.87 17.81 18.75
(Standard)
2nd 11.70 12.35 13.00
16T/40T 1st 16.87 17.81 18.75
(Close)
2nd 12.75 13.46 14.17
18T/38T 1st 16.87 17.81 18.75
(Wide)
2nd 10.77 11.37 11.97
With 15T Clutch Bell
(standard)
# of Spur Gear Teeth
2nd gear sets Gear 36 38 40
17T/37T 1st 15.75 16.62 17.50
(Standard)
2nd 10.92 11.53 12.14
16T/40T 1st 15.75 16.62 17.50
(Close)
2nd 11.90 12.56 13.22
18T/38T 1st 15.75
*
16.62 17.50
(Wide)
2nd 10.05
*
10.61 11.17
With 16T Clutch Bell
# of Spur Gear Teeth
2nd gear sets Gear 36 38 40
17T/37T 1st 14.76 15.58 16.40
(Standard)
2nd 10.24 10.81 11.38
16T/40T 1st 14.76 15.58 16.40
(Close)
2nd 11.16 11.78 12.40
18T/38T 1st 14.76 15.58 16.40
(Wide)
2nd 9.42 9.95 10.47
With 17T Clutch Bell
# of Spur Gear Teeth
2nd gear sets Gear 36 38 40
17T/37T 1st 13.89 14.67 15.44
(Standard)
2nd 9.64 10.17 10.71
16T/40T 1st 13.89 14.67 15.44
(Close)
2nd 10.50 11.09 11.67
18T/38T 1st 13.89 14.67 15.44
(Wide)
2nd 8.87 9.36 9.85
Gear Ratio Chart
The following gear ratio chart shows the
available combinations with optional
spur gears, clutch bells, and two-speed
gear sets.
Outer Toe Link
End Setup
Control Arm
Mounting Hole on
Rear Bulkhead
Upper Hole
Lower Hole
Outer Toe Link
End Setup
Control Arm
Mounting Hole on
Rear Bulkhead
Upper Hole
Lower Hole
Tall Center
Hollow Ball
Tall Lower
Hollow Ball
Tall Upper
Hollow Ball
Tall Center
Hollow Ball
To Eliminate Bump Steer: For Added Toe-In During Acceleration: