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Old 10-19-2009, 12:07 AM   #1
waktasz
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Default Cold weather autocross - Tire pressure up or down?

Using Hoosier a6...in general, if the temps are going to be 40 or 50 degrees or less, should I aim to go higher or lower than normal on air pressure, or stay the same?
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Old 10-19-2009, 07:00 PM   #2
BugeyeBoomer
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since your checking your pressure while its colder the tires will be lower than when heated up. Id say stay the same but if your really concerned about reaching the max on the tire, then lower it a few psi, not much though. IMO
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Old 10-20-2009, 10:15 PM   #3
waktasz
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I have no idea what you are saying.

I'm asking should I start lower, which might allow the rubber to warm up faster because of tire flex, or go higher to start, since I might not really gain much pressure in such cold temps on a short course.
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Old 10-21-2009, 07:10 AM   #4
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Quote:
Originally Posted by waktasz View Post
I have no idea what you are saying.

I'm asking should I start lower, which might allow the rubber to warm up faster because of tire flex, or go higher to start, since I might not really gain much pressure in such cold temps on a short course.
---kC
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Old 10-21-2009, 07:36 AM   #5
Mechie3
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I found in a 50 deg AX that lowering the rear tires made them barely heat up while the fronts heated up nicely. Made for some interesting drifts around the half circle turn arounds when the fronts grabbed and the rears wanted nothing to do with it.
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Old 10-21-2009, 12:32 PM   #6
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what kc said, i'd start higher because you're not going to be able to get much heat in the tires anyways.
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Old 10-22-2009, 10:52 PM   #7
ljaviation
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^^^ what he said.

On a colder track, I oticed my tires didn't heat up to optimum pressure for grip. I actually upped my pressure 3 psi on my 032's last weekend.
L J
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Old 10-26-2009, 04:25 PM   #8
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It's tough in cold weather. You might almost be better off tossing on some all-seasons some times. If it's 40F out, my winter tires(LM-25) have as much grip as my summers(RE01R) do on asphalt, maybe even more. ...and I wish I could say I was joking about that, but I actually think it's true from the few times I've run my summers in colder weather on the same roads.

I do agree with KC. I don't think it'll really matter, and you might just stick to higher just to maintain responsiveness.
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Old 10-26-2009, 04:30 PM   #9
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ugh. Weather was ok, but the sealed asphalt + 150 run Hoosiers + super tight course made me grumpy.
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Old 10-26-2009, 08:29 PM   #10
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Any auto-x is better then no auto-x.
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Old 10-26-2009, 08:32 PM   #11
waktasz
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Brum brum

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Old 10-27-2009, 07:10 AM   #12
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Hoosier Dirt Stockers on that bad bird?
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Old 10-27-2009, 09:37 AM   #13
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I generally go down a few psi, on the idea that the colder temps are going to make it harder to get any bite off the line and coming out of turns. Therefore, a slightly lower pressure will allow slightly more sidewall give.

That's the reasoning, at least. I have had good success both with the Subaru and the Camaro doing so.
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