Xray XB8R Instruction Manual - page 40
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 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.
3°~ 5°
KICK-UP
= 3°
1
= 4°
0
= 5°
1
CASTER
The XB8R has preset 15° caster of the front C-hub. Adjust the front caster angle by changing the optional caster eccentric bushings (#352171, #352172) 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 + 4° kick-
up = 19° 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
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.
CASTER ECCENTRIC
BUSHING
= 13° caster
= 14° caster
= 15° caster
= 16° caster
= 17° caster
13~17°
3°~ 5°
KICK-UP
= 3°
1
= 4°
0
= 5°
1
The caster of C-hub is set using different optional eccentric
bushings in different orientations. Refer to the table
above.
The kick-up is adjusted using exchanging the suspension
holders or optionaly using different eccentric bushings in
different orientations. Refer to the table above.
3˚
4˚
5˚
17˚
20˚
21˚
22˚
16˚
19˚
20˚
21˚
15˚
18°
19˚ *
20˚ *
14˚
17˚
18˚
19˚
13˚
16˚
17˚
18˚
1
0
1
CASTER ECCENTRIC BUSHING
KICK-UP
TOTAL CASTER = C-HUB CASTER + KICK-UP
XB8R SET-UP
FRONT KICK-UP - I.S.S SETTING
Using the optional #352320 plate and set of eccentric bushings #352315 you can easily adjust front kick-up of the front lower arms by exchanging the eccentric bushings in the plate
at the rear of the front bulkhead.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
* The XB8R features 19° and 20° total caster adjustment in the stock version. All other total caster
settings can be achieved by using the optional I.S.S. alu suspension holder and eccentric bushings.
R
4
R
5
FRONT KICK-UP
Adjust front kick-up of the front lower arms by changing the lower 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.
= 4°
= 5°