What Kremit said... it depends on the type of tires and stuff.
Also... on my SVT with Falken Azenis RT-215's, I run 52 front and 32 rear. Any less on the fronts and I start scrubbing the corner/sidewall. With 32 in the rear, the car is pretty neutral and I can get throtle induced oversteer to rotate around the tight turns. Any less in the rear... the rear slides too much; any more and I can't get the rear to kick out even if I try.
