Thanks for all the info, Guys.
We have a VW powered altered and I keep arguing with my son about tire pressure. I can plainly see the tires wrap up on the launch @ 4 1/2 #. It barely spins on launch but it does spin hitting high gear. It's a turbo so we can hear the tires over the motor. It gets a little squirley on the top end with that low tire pressure. We ran 8.06 @ 168 with the little motor and are trying for 7.50's with a new and bigger motor but I want to go with higher air pressure and we put a 33" tire on it.
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