I have run kumhos at around 20 to 22 psi, 3 to 4 sec burnout, depends on the track though, i have run 2.0 60' launching at 2500 rpm at some tracks and, i have run 1.7 60' launching at 4000 rpm, i do not suggest launching at 4000 unless car is hooking up, that particular day i was not spinning at...