Advertisement
Advanced Tuning adjustments
This advanced tuning guide will take you one step further into the
innovative adjustment possibilities that have been designed into
Jato. Follow the instructions provided here to unlock Jato's full
performance potential.
Suspension and Alignment Settings
Caster Adjustment (Front Suspension)
The caster angle of the front suspension may be used to adjust the
understeer (push)/oversteer handling characteristics of the Jato.
Generally, increasing the caster angle will move the truck towards an
oversteer condition (more traction on the front tires, less on the rear
tires). Decreasing the caster angle will create a tendency towards
understeer (pushing in the turns). From the factory, the front suspension
is set to a caster angle of 30-degrees. The caster angle of the front
suspension can be decreased to 25-degrees by installing optional 25-
degree caster blocks and steering blocks (see your parts list). When
using the 25-degree caster blocks, be sure to install the corresponding
steering blocks to maintain the original zero bump steer geometry.
Rear Anti-Squat
Jato's handling characteristics can be
influenced by adjusting the rear anti-squat.
Anti-squat is a fine-tuning tool that controls
how the rear suspension responds under
acceleration. Increasing the anti-squat will
cause the rear suspension to compress less
under acceleration and provide more rear
traction. Too much anti-squat will cause the
vehicle to become difficult to control while
braking or driving on rough surfaces. Anti-
Squat on Jato can be adjusted by replacing the rear suspension pin
mounts (anti-squat blocks). The factory blocks provide 2.25 degrees of
rear anti-squat. Anti-Squat blocks are available separately in 1.5, 3.0, or
3.75 degrees. The degrees are marked on the blocks for identification. To
replace the anti-squat block, the transmission must be removed:
1. Disconnect the brake rod end from the brake cam.
2. Remove the 3x12-buttonhead machine screw from
42 • Jato 3.3
Remove the 3x10-shoulder screw, and detach the
brake bell crank from the transmission housing.
the molded chassis brace behind the radio tray.
3. Disconnect the throttle return spring from the molded chassis brace.
4. Remove the two 4x18-countersunk machine
screws, the two 3x15-countersunk machine
screws, and the four 3x8-countersunk machine
screws from the bottom of the chassis shown.
5. Separate the transmission from chassis plate.
6. Remove the two 3x15-countersunk machine
screws that attach the anti-squat block to the
bottom of the transmission.
Roll Center
Jato has provisions for adjusting the roll center geometry of the front and
rear suspension. The roll center of the vehicle can be raised by mounting
the inner ends of the camber links in a lower position. Raising the roll
center 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 will provide more traction for the front wheels and
potentially more steering. Raising the roll center on the front and rear
equally will increase overall roll resistance without changing the handling
balance. The default factory locations are designed to make the truck
easier and more forgiving to drive and less likely to traction roll in turns.
• To adjust the roll center on the front suspension, remove or replace
the spacers (shims) under the inner camber links. Spacers are available
in different thicknesses. See your parts list.
• To raise the roll center on the rear
suspension, relocate the inner
Anti-Squat
camber links to one of the two
Block
holes (position 4 or 5 in image) in
the lower row of the rear camber
link attachment, located near the
base of the rear shock tower.
Once you make adjustments to the
roll center, you may need to re-adjust
the static camber to suit your tuning needs.
1 2 3
1 2 3
3
2
1
3
2
1
4 5
4 5
5
4
5
4
Advertisement
