I am going out to the track this next weekend and would like to know what I should run as far tire pressure for the road track and autocross I have 235 front and 275 rear. I would use my stockers but they won't clear my new brakes

Thanks

 

what is the height of the tire? For example p275/30zr19. The 30 part makes the difference cause if you go too sideways with it you might loose the tire bead seat if the air pressure is to low. There not drag strip tires which take low pressure around 15 pounds. Which 19's even with low profiles I would run it around 30-35psi. I work for Goodyear and most people that do those applications run that amount. Later>>>

 

they're 235/35 and 275/30. And I am going to a road track not the strip.

Thanks

 

oooh, pm me too... running 265/35 fronts and 255/40s stretched around a 10.5" in the rear... *aint rubbing a bish*

 

Any help from someone who knows?

Thanks

 

I would start with what you run on the street, mabye a little higher (I run around 36 front 38 rear when I autox, but I have 18's with no stretch on the sidewalls) and use chalk or white shoe polish to draw a line from the bottom of your tire up the sidewall. You can see how much your sidewall is rolling by how much of it gets rubbed off, so adjust your tire pressure accordingly

 

i would say start off with 36 and work your way down a few psi at a time. i noticed that when i went on the track on my mk3 supra 16" sawblades the car drove the best at about 34 psi front and 32 rear. i had it on 38psi for a little bit and it was pushing through the corners like crazy. would not want to grip at all. 35F and 34R i saw or somewhere around there....

 

different manufacturers have different max air pressures, for the tire depending on the build of the sidewall and design..some may have a max of 35 and some of 60psi's. i would run it 10 psi off max if the max pressure is on the upper 50's...and 5psi off max if under 44psi..test and see what you like the best..if u run it too low like half of max especially on low pro tires, the sidewall's bead won't hold well under load and can seperate from the rim....check the side wall for max air pressure..too much air pressure and you can blow the tire if you hit a bump hard enough and will wear out the inner treads way faster, and sacrifice turning/corning traction; less shoulder contact. not enough pressure and you may separate the bead under enough load(as in side flex) and wear out the shoulder excessively, and you will sacrifice some straight line traction/stability..test and see for the best psi combination, the chalk test xevutess7 recommended is also a good test for load/side roll or flex.