40
Front kick-up angle Characteristics
More kick-up
· 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 kick-up
· 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
After you set 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.
FRONT KICK-UP — I.S.S (optional)
R
4
R
5
!
FRONT KICK-UP
= 4°
= 5°
Kick-up
C-Hub caster
4°
5°
6°
7°
8°
17°
21°
22°
23°
24°
25°
16°
20°
21°
22°
23°
24°
15°
19°
20°
21°
22°
23°
14°
18°
19°
20°
21°
22°
13°
17°
18°
19°
20°
21°
* Arm will be in contact with the diff outdrive
Front eccentric bushing
Kick-up
Rear eccentric bushing
Upper position
6° *
Upper position
Upper position
7° *
Middle position
Upper position
8°
Lower position
Middle position
5° *
Upper position
Middle position
6°
Middle position
Middle position
7°
Lower position
Lower position
4°
Upper position
Lower position
5°
Middle position
Lower position
6°
Lower position
TOTAL CASTER = C-HUB KICK UP
1
0
1
1
0
1
Total caster value is the combination of C-hub kick-up. Once you set the C-hub caster, you have to add the value of kick-up to calculate the total caster.
Example: C-hub caster = 15° Kick-up = 4° Total caster = 15+4 = 19° final caster.
TOTAL CASTER:
STANDARD PARTS (19° or 20°)
Using standard parts, the XT8 has a total caster
range of only 19°~20°, depending on the kick-up
plate used (4° or 5° plate).
TOTAL CASTER:
OPTIONAL PARTS (17~25° range)
Using optional parts, the XT8 can have a total caster range of
17~25°. Optional parts include: caster eccentric bushings (for
C-hub), and kick-up eccentric inserts.
Kick-up
C-Hub caster
4°
5°
15°
19°
20°
To obtain this total caster range, use the following I.S.S. parts:
#352311 Front plate, #352320 Rear plate, #352315 Eccentric
inserts, #357212 Inner pins, #352174 Caster bushings (1°) or
#352175 Caster bushings (2°).
Note: You cannot combine composite plates (std) and I.S.S. plates (with eccentric bushings). Also, you must use the appropriate inner pivot pins (shorter) with I.S.S. components.
C-HUB CASTER: STANDARD PARTS (15°)
Using standard parts, the XT8 front C-hub has a preset value of 15° caster.
Caster angle
Characteristics
Less caster (block more vertical)
· increases off-power steering into a corner
· decreases on-power steering out of and in a corner
· decreases straight-line stability
More caster (block more laid-back)
· decreases off-power steering into a corner
· increases on-power steering out of and in a corner
· increases straight-line stability
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.
The caster of C-hub is set using different optional eccentric bushings in different
orientations. Refer to the table above.
= 13° caster
= 14° caster
= 15° caster
= 16° caster
= 17° caster
13~17°
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
!
CASTER
C-HUB CASTER: I.A.C (OPTIONAL) (13~17° RANGE)
Using optional caster eccentric bushings, the XT8 front C-hub can have a caster range of 13~17°. Optional
caster eccentric bushings (#352174, #352175) are used in the front lower arms (in front of the C-hub).
STANDARD PARTS
Using standard parts included in the XT8 kit, you can easily adjust the kick-up of the front lower arms by changing the
lower plate at the REAR of the front bulkhead. You can use either the 4° or 5° plate.
OPTIONAL PARTS
Using the following optional I.S.S. parts, you can easily adjust kick-up of the front lower arms between 4~8°:
#352311 front plate, #352320 rear plate, #352315 eccentric bushings, #357212 lower inner pin
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
NOTE:
You cannot combine composite plates (std) and I.S.S. plates (with eccentric bushings). Also, you
must use the appropriate inner pivot pins (shorter) with I.S.S. components.
XT8 SET-UP
Summary of Contents for XT8
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