Anti-Lift Kit - Front Wishbone Control Arm - Subaru

The ALK effectively modifies the position of the side view instant centre on the front suspension. The side view instant centre is the pivot point for the side view swing arm (also the pivot point for the suspension at that instant), which is a line drawn from the tire contact patch to the side view instant centre (under braking – for acceleration it is drawn from the wheel centre). The slope or angle of this swing arm (effectively the position of the instant centre) describes the amount of anti-dive and anti-lift present in the front suspension.

The instant centre is found by the intersection of the two lines. The first is the projection of the lower control arm , say through the chassis mounts, behind the front wheel the second is the normal to the axis of the strut tower at the top of the strut, projected behind the front wheel in the case of the WRX.