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MEASURING & CORRECTING TWEAK
Measure and correct chassis tweak by fi rst adjusting shock preload, and then by adjusting the anti-roll bars.
INITIAL STEPS SET-UP COMPONENTS
Prepare the car as follows: Use the following set-up components:
• Shocks: Attach the shocks
• Anti-roll bars: Disconnect the front and rear
anti-roll bars (initially).
• Wheels: Attach the wheels. Make sure left/right
pairs of tires are the same diameter
(59mm front / 61mm rear).
• Flat setup board
1. Lift and drop the front and rear ends of the car a few cm’s to let the suspension settle.
2. Place a pointed tool underneath the FRONT end of the chassis at its middle point, and lift the front
end. If one FRONT wheel lifts before the other, the REAR end of the car is tweaked from the rear
shock preload settings.
3. Adjust the preload on the REAR springs until both front wheels lift at the same time.
Increase the preload on the REAR spring diagonally across from the FRONT wheel that lifted fi rst,
and decrease the preload on the other rear spring.
Adjust both rear springs in equal but opposite directions, otherwise you will change the rear ride
height.
Example: If the front right wheel lifts fi rst, INCREASE the preload on the rear left spring, and
DECREASE the preload on the rear right spring by an equal but opposite amount.
CORRECTING REAR TWEAK – STEP 2: ANTI-ROLL BAR
After you have corrected rear tweak by adjusting shock spring preload, reattach the rear anti-roll bar,
re-check rear tweak, and correct it by adjusting the rear anti-roll bar linkages.
4. Reconnect the rear anti-roll bar.
5. Place a pointed tool underneath the FRONT end of the chassis at its middle point, and lift the front
end. If one FRONT wheel lifts before the other, the REAR end of the car is tweaked from the rear
anti-roll bar.
6. Adjust the lengths of the rear anti-roll bar linkages until both front wheels lift at the same time.
INCREASE the length of the rear anti-roll bar linkage diagonally across from the FRONT wheel that
lifted fi rst, and decrease the length of the other linkage. Adjust both linkages in equal but opposite
directions.
Example: If the front right wheel lifts fi rst, INCREASE the length of the rear left linkage, and
DECREASE the length of the rear right linkage by an equal but opposite amount.
CORRECTING REAR TWEAK – STEP 1: SHOCK PRELOAD
Determine if the REAR of the car is tweaked by checking at the FRONT of the car. Correct rear suspension tweak by adjusting preload on the FRONT
shock springs.
TWEAK
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