Body Height Adjustment

You want the lowest Body Height possible. The lowest Body Height will reduce the centre of gravity, enhancing cornering performance. The lowest Body Height will reduce drag and increase top speed. 

The limiting factors for reducing Body Height are you will experience bottoming out. If the front Body Height is too low, the front wheels will hit the wheel wells and you will experience a reduced corning ability or a complete stop in steering wheel rotation. If the rear Body Height is too low you will experience an instant loss in traction, resulting in either an uncontrollable spin or no ability to turn.

When increasing Offset to "Wide" when changing Wheels, you will have to increase ride height to ensure no fender interference occurs.

Too much rake and you will experience long uncontrollable slides. As rake increases, as does drag created, lowering top speed. With increased rake, more rear camber angle will be needed to maintain grip because of increased roll angle. Front camber angle may also need to be increased due to roll angle.

To get the maximum performance out of a road vehicle, you will want to exercise the full range of Body Height. Lower grip tyres or higher power vehicles may need at extremes, maximum, if not close to maximum Body Height. A higher Body Height will increase driving stability whilst accelerating and or at high speeds. For instance my Amuse S2000 GT1 Turbo has maximum Rear Body Height with the Front Body Height -10 lower than maximum.

Changing the wheel offset to wide may lead to you needing a higher Body Height to prevent from the wheels hitting the wheel wells, preventing the vehicle to turn.

In general, I recommend a base front Body Height, +20 - 25mm from the minimum Body Height setting. The rear Body Height, +10mm higher than the front Body Height, + the minimum rear Body Height. Having a higher rear Body Height than the front is known as "rake". Rake will raise the rear roll centre increasing weight transfer between the rear wheels, generating a pendulum effect or oversteer as roll stiffness decreases (roll centre can be described as the height of the centre of gravity of an axle).