The Problem:

Over lowering a MacPherson strut based suspension can often result in loss of grip.

Roll Center & Ride Height: 

So what does this have to do with the ride height? Well, a picture speaks 1000 words, so please consult the image below to see at a glance what we're dealing with.

As you lower your coilover equipped car, with MacPherson suspension the lower control arm will eventually start to point upwards at the outboard end, referencing ground level. What this does, in reality, is drop the roll center below ground.

With the roll center below ground height more weight is transferred via the springs (likewise raising the roll center reduces weight transfer through the springs and increases weight transfer through sprung mass). This makes body roll more pronounced and in turn increases the leverage against the lower roll center, making the instantaneous center move well outside the vehicle causing even more weight transfer and roll. Eventually, the car will “fall over” onto the outside front wheel. The tires limits of grip will now have been breached, no more weight transfer can occur. To the driver this is a very frustrating feeling, quite often on a front wheel drive car the rear inside wheel will now be airborne, and the car just understeers relentlessly.

The Solution

The Whiteline Roll Centre/Bump Steer Correction Kit!