hey guys, first time auto crosser here..

just wondering what my tire pressure should be.

im at 34 psi right now.. should i raise it to 40psi or 42 psi?

any help would be appreciated.

 

Man, I could have sworn we just talked about that up here but I can't find it, maybe it was a different forum, ahhh, the old age thing....

Are you talking about street tires?

 

yeah street tires.

 

Start off in the 40lb range, maybe 40-42 in front and 36-38 in the rear, it's agood starting point anyway.

 

I still run street tires w/ one of the local clubs (3 of them!) in their street tire class. I think 37 front and 30 rear works really well for me. thats w/ Kumho 712's in 275/40/17 size.
I think anything more than that just doesn't work for me, especially more than 32 in the rear.

md

 

For some reason quite a few people have told me to use higher pressures....

I used my stock Goodyear Eagle F1's this season

For the rears definately keep it at 30 psi or lower. I ran somewhere between 26-28 psi in the rears. Go much higher than 30 in the rear and you lose forward byte. I didn't even bother to increase my pressure in the rear on wet surfaces.

As for the fronts I was using about 34-36 psi. As far as I could tell I was not rolling over the tires onto the sidewalls. (Well unless I turned the wheel way too much) For wet surfaces or those that required very sharp turns (pin turns) I pumped the front pressure up to about 40 psi. It is possible that I could have gone faster with the higher pressure, but I never tried it unless it was wet. The reasoning I used was that I was decreasing the contact patch of the tire with the higher pressure and therefore increasing the wet traction.

Apparently drag radials have sidewalls that are more flexible, which means they would require higher pressure to not rollover onto the sidewalls.

It is possible that one of the reasons why I was able to run lower pressures in the front was the slight amount of negative camber in my alignment as well as the 1"3/8 (aka 35mm) front anti-sway bar I bought from Sam. I highly recommend the sway bar to anyone with an f-body.

Aaron
35 BS/ESP/CP

 

i know this is odd, but the same car on the same tires will do differant things with each driver. it is hard to call what you will do, but most these numbers i see are what you need to start with. readjust later!!

 

i did 40 psi on all 4's

 

I use 38psi cold in the front's and 32psi cold in the rears. Once they warm up I get pretty even tire temps across the contact patch. This is with -1.0 camber, on Potenza S-03's.

Ironically, a friend let me use his 275/40/17 race tires yesterday. I used Kumho's in the rear and Hoosier's in the front. Same pressure and still about the same tire temps.

 

i recommend lowering your tire pressures for the wet