My experience is best grip is found around 38 to 39 psi hot on the front. But as pointed out, you will kill your tires if your still on stock suspension and camber. I like 36 psi hot in the rear tires. If your using "air" you'll find the pressures increasing about 10 psi if your driving over 80%. DOT racing tires don't change what pressure works best on my car at my tracks. Not knowing how hard your going to push, I like RCK00's 34 psi recommendation.

Les