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Advanced Tuning Adjustments
Shock Piston Hole Sizes
Shock Tuning
1
1
1
Shock Pistons
The shock pistons can be replaced with
the available optional pistons to vary
Piston 1: 1.10 mm
the amount of damping. Optional
pistons with bypass holes that are
2
2
2
larger or smaller (1, 2, or 3) than the
factory installed stock pistons can be
used to decrease or increase damping
Piston 2: 1.00 mm
respectively. Change the pistons if you
3
3
3
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.
Piston 3: 0.95 mm
Shock disassembly
The shocks must be removed from
the vehicle and disassembled to
change the pistons. Use the shock
Never slide the threads on
exploded views included with the
the shock rod past the
model to aid in the assembly process.
X-ring seal when it is
installed and compressed
1. Remove the spring and lower
by the bottom cap of the
shock. Doing so will
2. Remove the shock cap (A) and
damage the seal and cause
shock oil to leak.
3. Remove the lower cap (B) and
4. Use side cutters to grip the shock
5. Remove the shock shaft with piston from the shock body out through
Shock assembly
1. Replace the stock piston with desired optional
2. Position the new piston onto the shock shaft
44 • Revo 3.3
spring retainer from the shock.
empty the shock body of shock oil.
the X-ring from the shock body.
shaft just above the rod end (C).
Remove the rod end from the shock
shaft using the suspension multi tool (C).
the top of the shock body.
piston. Be careful not to lose the small washer
located below the piston.
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.
Multi-tool Shock Functions
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
A. Tighten/Loosen Upper Cap
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.
B. Tighten/Loosen Lower Cap
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
C. Remove/Install Rod End
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.
Piston Installation/Removal
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