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sasquatch's Avatar
 
Join Date: Dec 1999
Location: Emmett, ID USA
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Quick auto-x tire pressure question..

The way our auto-x are set up here is you get your 4-5 runs right after each other, with limited wait time. I will not have the opportunity to play with tire pressures. Could someone give me a good pressure to start out with? I am running 17" rims (7.5 and 9") on the 87 NA, with Khumo 712's. I am not a pro or anything, just looking at what pressure to compete with.

Thanks in advance.

Jay
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Old 03-26-2003, 10:02 AM
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Join Date: Oct 2001
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Hey Jay,

Where were you at the last one, huh?

I would start about 40 or so all around and adjust from there.
We usually get enough time between runs to play around with this stuff (I had to do the same with my Hoosiers a couple weeks ago).

Or you could get race tires and put them on the wheels I have for sale.

See you this weekend.

Ed
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Last edited by theFONZ; 03-26-2003 at 10:44 AM..
Old 03-26-2003, 10:41 AM
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For most street tires, anywhere from 36-40 psi should be a good start. Go with even pressure all around. If you are exhibiting a lot of push (understeer), then just lower the rear pressure by 2 psi steps.

-Z.
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Old 03-26-2003, 11:27 AM
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As a side note, my car was slowly starting to handle worse and worse. Of couse I'm thinking...
oh no! bushings? sway bars? shocks? $$$$?

So I'm gassing her up and, hmmm maybe I should check the tires... sure nuff, tire were warm (about 2 miles from home-sunny and warm day) 32 PSI...
I pump them up to 38 PSI all around...
Like night and day, what a differece!
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Old 03-26-2003, 11:35 AM
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Thanks for all the replies. Ed, no this is my first one this year. I have been out of town on a long business trip. But the wife and I will be there this weekend. She is going to run the 914.

Jay
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Old 03-26-2003, 12:27 PM
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i have 17's with 712's (7.5" )and at the last auto-x i went to i set them to 40psi all the way around and it seemed to work really well with those tires.
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Old 03-26-2003, 01:33 PM
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This is exactly what I am looking for, good input. THanks guys. I will set mine at 40psi and go from there. I think I ran really low pressure (32-34) last time and I did not like the handling.
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Old 03-26-2003, 01:37 PM
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I use 32psi when the tires are stone cold sitting in the garage.
Old 03-27-2003, 06:56 AM
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