dont need alot of pressure for drag racing, lowering ressure increases amount of rubber on floor for a better launch but once u get up to speed the centrafugal speed of the wheel/tyre keeps it up and narrows the tyre down a touch so its nto too low and created drag, 16psi is about what it wants to bee at the front and about 30-32 at the rear oo i sounded clever then untill i spealt centrifugal wrong lol