To get the most grip from your tires, you need to maximize the contact patch. To do this, you chalk your tires along the outer rib of the tread down to the sidewall. You get the most grip when you roll the tire all the way to the rib of the tire without riding on the sidewall itself.
First you maximize grip at all four corners by determining the lowest pressure you can run without rolling on the sidewall. Then you figure out if the car is oversteering or understeering. If you are understeering, you add pressure to the rear to decrease the contact patch, until the car is neutral. If you have oversteer, you add pressure to the front.
Maximize grip at the front, then reduce rear grip to balance the handling.
Last edited by Kubica; 08-16-2012 at 11:31 AM.