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Old 04-26-2006, 08:37 PM   #1
hifidk
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Tire pressure for Auto X

Yes, this is another thread about the tire pressure.
I searched but I couldn't get answer that I wanted.
Anyways, I have csl replica wheels w/ size 235/35/19 and 245/35/19.
What kind of tire pressure should I have before going to auto X.
This person recommended me to put 4-5 extra psi for that day.
So, what kind of tire pressure do you guys have on autox day?
Oh, and also, how bad is it to have 19 inch wheels at autox?
Thanks in advance!
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Old 04-27-2006, 01:01 AM   #2
vaio76109
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Start off around 40 or 42 hot. Pressures probably rise 5psi from cold, so say start at 35-37 cold.
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Old 04-27-2006, 02:00 AM   #3
hifidk
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Quote:
Originally Posted by vaio76109
Start off around 40 or 42 hot. Pressures probably rise 5psi from cold, so say start at 35-37 cold.
Thanks!
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Old 04-27-2006, 01:05 PM   #4
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Google "unsprung weight". I would stick with 17's for autoX.
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Old 04-27-2006, 05:17 PM   #5
Bim Growl
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When I had street tires, I would start with 36 front, 38 rear, and adjust accordingly. Your tires won't heat up that quickly at auto-x, so you should defintely start with 4-5 psi extra from what you run on the street normally.

Good Luck!!! Have Fun!!!
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Old 04-27-2006, 05:18 PM   #6
hifidk
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Quote:
Originally Posted by leej323
Google "unsprung weight". I would stick with 17's for autoX.
I would too if I have my stock wheels
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Old 04-27-2006, 05:19 PM   #7
hifidk
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Quote:
Originally Posted by Bim Growl
When I had street tires, I would start with 36 front, 38 rear, and adjust accordingly. Your tires won't heat up that quickly at auto-x, so you should defintely start with 4-5 psi extra from what you run on the street normally.

Good Luck!!! Have Fun!!!
Thanks for the comment!
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Old 04-29-2006, 04:24 PM   #8
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Most tires have a wear indicator on the shoulder. It's helpful to use it as an indicator for baseline pressure. It'll look like a carrot or an arrow generally. Put enough pressure in the front tires to just keep the wear off that mark. Then adjust the rear pressure to balance the car. You should also mark your sidewalls with shoe polish or chalk to see exactly how much the sidewall is rolling.
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Old 04-29-2006, 05:24 PM   #9
hifidk
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Quote:
Originally Posted by robweenerpi
Most tires have a wear indicator on the shoulder. It's helpful to use it as an indicator for baseline pressure. It'll look like a carrot or an arrow generally. Put enough pressure in the front tires to just keep the wear off that mark. Then adjust the rear pressure to balance the car. You should also mark your sidewalls with shoe polish or chalk to see exactly how much the sidewall is rolling.
I had a auto X today and couldn't use your tips.
However, great tips! I will use them for next event. Thanks!
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