Xray XB8 Instruction Manual page 40

XB8 SET-UP
H FRONT KICK-UP
Adjust front kick-up of the front lower arms by changing the eccentric bushings in the
plate at the rear of the front bulkhead. You should also adjust the angle of the front
upper arms so that they are parallel with the front lower arms.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
Front kick-up angle Characteristics
More kick-up
Less kick-up
After you adjust the front kick-up angle, you should adjust the angle of the front upper arm inner pin so that it is parallel with the front lower arm. This will help to prevent binding
during suspension movement. Each front upper arm inner pin rides in two eccentric bushings (one on each end). By using different combinations of positions, you can angle the pin.
Note that these eccentric bushings are also used to adjust the front roll center.
H CASTER
Adjust the front caster angle by changing the caster eccentric bushings in the front lower arms (in front of the C-hub). After you set the caster angle using the eccentric
bushings, you must adjust the front upper arm position. The final caster also depends on the kick-up setting. Therefore once you set the caster on the C-hub you have to add
the value of kick-up to calculate your final caster. Example: 15° caster on C-hub + 3° kick-up = 18° final caster. Use the reference table to calculate your final caster easily.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
Caster angle
Less caster (block more vertical)
More caster (block more laid-back)
After you have set the caster using the eccentric bushings, you need to set the front upper arm
position. Remove all clips around the front upper arm and move the front suspension a few times
to let it settle. The front upper arm will move to its optimal position on the pin. Then insert the clips
around the arm so that the arm stays in its optimum position.
TOTAL CASTER = C-HUB CASTER + KICK-UP
17˚
16˚
15˚
14˚
13˚
40
· more weight transfer to the front of the chassis off-throttle or under braking
· chassis compresses or drops more off-throttle or under braking
· handling is improved on bumpy tracks
· decreased steering response
· less weight transfer to the front of the chassis off-throttle or under braking
· chassis compresses or drops less off-throttle or under braking
· handling is improved on smooth tracks
· increased steering response
Characteristics
· increases off-power steering into a corner
· decreases on-power steering out of and in a corner
· decreases straight-line stability
· decreases off-power steering into a corner
· increases on-power steering out of and in a corner
· increases straight-line stability
KICK-UP
3˚ 4˚ 5˚
20˚ 21˚ 22˚
19˚ 20˚ 21˚
18˚ 19˚ 20˚
17˚ 18˚ 19˚
16˚ 17˚ 18˚
= 17° caster
= 16° caster
= 15° caster
= 14° caster
= 13° caster
The caster of C-hub is set using different eccentric bushings
in different orientations. Refer to the table above.
The kick-up is adjusted using different eccentric bushings in
different orientations. Refer to the table above.
= 3°
= 4°
= 5°
= 3°
= 4°
= 5°