Autocrossing 2morrow. What PSI tires?

**JwMonE99** · 04-05-2008, 07:46 AM

Tomorrow will be my first time autocrossing my car. What PSI should I run my tires at? I have the stock rim/tire thing on my car.
I think its reccomended for 35 but I heard for autocross it should be 5 over? Can anyone vertify with me? Need answer ASAP thanks

**Speedy_Gonzales** · 04-05-2008, 07:48 AM

what speeds ?

**shady milkman** · 04-05-2008, 08:05 AM

your tire sidewalls must be be proper...dont under inflate your tires for sure. i'd find a happy medium..if they say 5 over but your not sure..go 2-3 over

**autocrosser** · 04-05-2008, 11:40 AM

It's easier to let air out than put it in. Start at 40f and 35r. Mark the shoulders with white shoe polish or chalk. Let air out until the white wears off right to the tips of the little arrows on the sidewalls.

**JwMonE99** · 04-05-2008, 07:15 PM

Originally Posted by autocrosser

It's easier to let air out than put it in. Start at 40f and 35r. Mark the shoulders with white shoe polish or chalk. Let air out until the white wears off right to the tips of the little arrows on the sidewalls.

Thats a really good tip to know. Do you have any advise for me for 2morrow?

**Eugenio_SS** · 04-05-2008, 09:28 PM

was gonna suggest 42/36 as starting point.
how did it go ?

**7camaro7** · 04-05-2008, 10:54 PM

I ran 39f and 30r and I did fine

**JwMonE99** · 04-06-2008, 02:53 AM

Well its almost 7 in the morning here. I got a few more hours till it starts. I will let you guys know how it went later on today.

**bige97** · 04-06-2008, 08:07 PM

so how did you do?

**autocrosser** · 04-07-2008, 03:42 PM

Originally Posted by JwMonE99

Thats a really good tip to know. Do you have any advise for me for 2morrow?

Other advise? Well, basically AX comes down to one thing, Slow in and Fast out. When that makes sense to you in many many ways, you're starting to get it.