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Old 05-03-2010, 07:01 PM   #1
shb5007
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Tire Wear / Adjustments

I ran my first autocross on my new Dunlop Star Spec tires a few weeks back.

I have a few questions about how my tires wore, and adjustments.

First of all I ran 45 pounds of air in all four tires.

My front tires wore well over the wear indicators.

The rear tires were well inside the wear indicators.

Is this a tire pressure issue? camber issue? or another issue?


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Old 05-03-2010, 07:16 PM   #2
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well you have to think about how much your motor weighs, it's gonna smash the tires down a lil more. up them in the front and lose some in the back.

use some chalk on the side walls to help indicate too.

it's kinda weird though, i would think star specs could go with less psi then 45?

what tire size are you running?
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Old 05-03-2010, 07:23 PM   #3
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I am running 215/40ZR17.

It could be a front camber issue...

Was thinking about going to check out the alignment, but I think I am going to install new springs and struts and that will put me right back at the start.
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Old 05-03-2010, 07:25 PM   #4
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EDIT...double post.
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Old 05-03-2010, 07:26 PM   #5
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I've never needed over 38 psi with Hankook RS2's for front pressures. rear pressures were a couple pounds higher for rotation, but tire brands can react differently. The tires I ran couple weeks ago needed four pounds less in the rear too not to spin out.
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Old 05-03-2010, 07:30 PM   #6
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If I recall correctly Scott was running 40 pounds in the front of his Star Specs on the same course in his Focus with some suspension work.

I am on a stock SVT suspension.

It was a pretty high speed course...
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Old 05-03-2010, 07:38 PM   #7
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i thought camber was to make the tire wear more evenly? like the whole contact patch?

lol i dunno, that's why i'm LearNing..
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Old 05-03-2010, 11:59 PM   #8
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Don't take this wrong but you could be way over driving your car into a corner. If you are plowing into a turn and keep trying to turn harder you would be rolling the sidewall more. I have never seen you drive but its what I was taught when I was and still am learning.
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Old 05-04-2010, 11:37 AM   #9
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Originally Posted by bringler26 View Post
Don't take this wrong but you could be way over driving your car into a corner. If you are plowing into a turn and keep trying to turn harder you would be rolling the sidewall more. I have never seen you drive but its what I was taught when I was and still am learning.
No offense taken, could very well be true. I am new to all of this! :)
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Old 05-05-2010, 01:31 PM   #10
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What are you alignment specs? Those, along with over driving into corners, could be what is causing your problems.
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