Raising the pressure in the rear will induce oversteer. Increased pressure will cause the middle of the tires to wear faster. Lower pressure will cause the outside edges of the tires to wear faster.

I usually run 35 psi all the way around on the street. If I'm drag racing, I increase the rear pressure about 5 psi and decrease the front about 10 psi. If I'm autoxing or doing a track event, I drop the front pressure about 5 psi and increase the rear pressure about 3 psi.

Tire pressures are a personal thing, so what one person does may or may not work for you. Experiment when you're on the track and see how the car reacts. With practice, you'll learn what pressures suit your driving style and car.