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To start out, we installed Whiteline’s anti-lift and caster correction kit (part # KCA316). Constructed of polyurethane and aluminum, these bushings replace the front control arms' rear mounts to provide an additional 0.5° of caster while decreasing the front end’s anti-dive and lift values. Anti-dive and lift geometry uses the engine or brake torque make the suspension harder during braking and acceleration. By making the front suspension harder during braking and acceleration, we increase weight transfer and reduce front grip, increasing understeer. Think of anti as adding effective spring rate while torque is being applied to the wheels. You would see this as increased understeer under trail braking and on corner exit.
The Whiteline kit reduces the amount of anti in the geometry, thus reducing the change in wheel rate as brakes or throttle are applied. This reduces understeer by reducing weight transfer, improving grip under these conditions. The softer front rates under braking and acceleration also allow better contact over rough pavement, reducing instability.
One drawback of a poorly designed anti-lift kit is a reduction in caster over very large moments of deflection. The Whiteline kit, however, adds additional caster that more than covers any reduction in caster from anti-lift geometry. Increased static caster also helps the front suspension gain negative camber during cornering, as well as improved turn-in feel and immediacy.
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| Whiteline’s anti-lift and caster correction kit (part # KCA316). This kit helps turn-in feel and camber gain through an increase in caster, as well as increasing stability and decreascing understeer under braking and acceleration by reducing the car's anti-lift and dive geometry. |
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| The Whiteline anti-lift and caster correction kit installed. Installation of these bushings is straightforward, as you are replacing the bushing and mount as one unit. |
To complement our anti-lift and caster kit, we replaced the front bushings on the front control arms with Whiteline part # W0503. While the stock units did not have any void areas, these bushings add that last bit of feedback from our front suspension that was missing with a higher durometer polyurethane bushing.
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| Whiteline part # W0503 replaced the front bushings on our front control arms with higher durometer polyurethane bushings. The lips and knurling cast into the bushings help with grease retention. No squeaky bushings here. The packet on the left is moly grease safe for polyurethane. |
Out back (not the steakhouse), we solved yet another source of squish in the rear trailing arm bushings with Whiteline part # W0504. The stock rear trailing arms were built with an amazing amount of air space in them. So much air space, in fact, that we seriously question this part’s ability to last a reasonable length of time, especially with hard use, not to mention its ability to control toe deflection over bumps and under braking.
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| Whiteline’s rear trailing arm bushings (part # W0504) remove unwanted squish. The washers and crush tube are installed inside of the stock mount to prevent bind. |
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| Holy airspace batman! The stock bushings in the rear trailing arms (right) had questionable amounts of flex built in. The Whiteline replacements should greatly reduce rear-end wander under braking and over bumps. |
