This will be my first time tracking the S and I have a set of Toyo RA1 255's on the rear 245's on the front I would like to know what tire pressure I should start out at the track is 1.23 miles lots of braking zones and flat as a board.

thanks for any help

 

i dont have any experience with the RA1, but i would start with slightly under oem's recommendation. Last time i was at the track i filled them to 30 psi, then i marked the side to see how much the tire is flexing.

perhaps some pro should share about their experience

 

interested too as i want to learn how to fine tune tire pressures.

 

i've found 37f/34r hot pressures to work on my 235/255 r888 on stock ap2 wheels sufficient. tire has some sidewall roll, but it is not bad once you get used to it.

 

I run 40/36 front to rear respectively. Seemed to have even heat across the surface of the tire. (225/255)