go to google....type in "  Nitto 555 tire pressure for track "

every answer i read varies from 17 to 23 depending on the vehicle....ambient temperature and heated temp after burnout...you'll have to run a few passes and play around with it in order to see whats right for you....

i run 12 in mine 

Like rubn1out said .. every trip to the track is going to be different. You will have to play around to see what's best for the weight transfer of your car under different situations. Keep a log on the ambient air temp, track temp and what pressure(s) you used that day so when you take your next trip to the track you will have a base line to work from. 

What they said

 alright thanks for your input guys, I guess I'll be finding out this friday night!

Once you find where yours likes to be. It shouldnt vary alot from that.  Like Gunner said. Each time will be different due to track conditions, temp ,ect.  It shouldnt change more than a few lbs. though. You wont need 12 one time, and 20 the next. So you'll be fairly close, every time you go.

thanks 91

yep yep. Anytime