16
FRONT SUSPENSION
KICK UP
ROLL CENTER
TRACK WIDTH
All possible mounting alternatives
of eccentric bushings
The tables describe the amounts of adjustment using the center and outside positions of the eccentric bushings.
The middle position eccentric bushings allow for finer adjustment increments.
The track width is directly influenced by the size of the
wheels and tires used.
Example:
KICK-UP
TRACK WIDTH
ROLL-CENTER
FF
FF
FF
FR
FR
FR
(°)
(mm)
(mm)
=9
°
=8
°
=10
°
=8
°
=7
°
=9
°
=10
°
=9
°
=11
°
=
+
0.75mm
= 0mm
=-0.75mm
=
+
1.5mm
= 0mm
=-1.5mm
KICK-UP
C-HUB CASTER
7°
8°
9°
10°
11°
6°
13°
14°
15°
16°
17°
9°
16°
17°
18°
19°
20°
Caster is the angle between the steering pivot
axis and the vertical plane. Caster is affected not
only by the C-Hub caster, but also by the front
kick-up angle relative to the flat chassis bottom.
The table indicates how kick up angle effects
total caster.
The XB4’s stock caster blocks are 9°, but 6°
blocks are available as an option.
TOTAL CASTER=C-HUB CASTER
+
KICK UP
0(FF) - 0(FR) = 9°
0.5(FF) - 0(FR) = 9.5°
1(FF) - 0(FR) = 10°
= 9
°
= 9.5
°
= 10
°
The XRAY alu front lower suspension holders provide great range of adjustment for the front suspension. Using different combinations of eccentric bushings, fine adjustment of front kick-up, roll-center, and front
track-width can be obtained. For more information about the influence of kick-up, front track-width, and roll centers on car handling, please refer to HUDY Set-up Book (#209100).
➊
➊
➋
➌
➌
➍
➍
FR
FF
Composite eccentric bushings
INITIAL POSITION
1º
1º
0.5º
0.5º
0º
Composite eccentric bushings
INITIAL POSITION
1º
1º
0.5º
0.5º
0º
Check for free movement
If the suspension arm does not move freely use a
HUDY Arm Reamer to size the holes of the arms
FRONT ARM
L=R
903312
SFH M3x12
Arm Reamer 3.0mm (HUDY #107633)
FRONT BLOCK
IMPORTANT
ECCENTRIC BUSHINGS HAVE TWO DIFFERENT OFFSETS FROM THE CENTER.
Middle position = 0.5° or 0.375mm from center.
Outer position = 1° or 0.75mm from center.
Summary of Contents for XB4
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