Pump the pressure up a 1/2 lb. at a time until it spins and then go down the other way 1/2 lb. from where you started to see what the high and low pressure limits are for your car and these tires scope twocents
Test, tests until your the fastest guy in your deal thumbs

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)