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11-05-2012, 12:13 PM | #1 |
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Outside tire wear
I've been getting awful outside tire wear @ -2.5 camber and I'm a little confused. I run KW CS with the rec'd settings, and they feel great. I initially tried 30-31 psi cold on AD08, which equated to around 40 hot. I bumped the pressure up to 44 hot and I was still getting bad outside front tire wear, does anyone have any suggestions?
I always thought that over -2 camber with proper pressures would at least keep outside tire wear at bay somewhat. My tires have 3-4k street miles and 6 track days and the front left is to the point that I'm concerned about cording on the outside. Last edited by Porschefile; 11-05-2012 at 12:20 PM.. |
11-05-2012, 12:38 PM | #2 |
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I have bad outside tire wear but I am running stock upper mounts that only give me -1.5 degrees camber at most. Maybe try more camber? It's definitely not due to soft sidewalls, the AD08 have some stiff sidewalls.
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11-05-2012, 12:48 PM | #3 |
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Do you have a better picture? Maybe turn the wheel and snap one.
Are you actually "wearing" the outside or just going by that it's scrubbed?
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11-05-2012, 01:04 PM | #4 | |
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The tire is apparently rolling over. But I didn't think that would happen with over -2 camber and over 40 psi hot. |
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11-05-2012, 01:05 PM | #5 |
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Unfortunately -2.5 is about all I can handle for street tire wear. I had -3.3 and the insides of my tires were hating it. The outsides were better then, but surely I don't need -3+ to avoid scrubbing past the tread surface.
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11-05-2012, 01:41 PM | #6 |
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Any possibility that you're rubbing on the fender at full compression? It looks like you've got some scrub marks btw/ the tread blocks and the Yoko letters. I was running a rear spacer and found out I had some subtle rubbing issues, just on track. Not sure how much lowered you are, just a thought.
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11-05-2012, 01:43 PM | #7 | |
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11-05-2012, 02:06 PM | #8 |
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This probably just means that you are working your tires to the maximum!
When I ran 3+ degrees of camber with AD08, the outer edge still wore out just like yours. Sometimes with a heavy car like ours, outer edge wear is unavoidable. It may help to control the platform more by adding springs/roll bars, but probably not something you want to do on a street car.
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11-05-2012, 02:50 PM | #9 | |
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I already have 514/800# springs, but stock front bar. Do you think a stiffer bar would help? I've also had thoughts that the stiff rebound of my dampers is contributing, but backing it down a few clicks made it understeer to the point that I didn't care about tire wear, I had to change back. |
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11-05-2012, 03:00 PM | #10 |
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Are you running staggered sizes? Can you put a Go-Pro by your tire?
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11-05-2012, 03:12 PM | #11 |
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11-05-2012, 03:25 PM | #12 |
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Are you getting any chattering with your understeer?
Perhaps you need to up your rear tire pressure to remove some rear grip to regain a better balance. What are you running rear psi? 30mm difference front to rear is pretty substantial...more than the factory offset.
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11-05-2012, 03:28 PM | #13 | |
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11-05-2012, 03:56 PM | #14 |
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You're running 265/30 on a 9" rim? That might be the problem...ballooning the tire a little and lowering the effective stiffness of the sidewall.
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11-05-2012, 04:07 PM | #15 |
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11-05-2012, 04:49 PM | #16 |
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I think it would allow the contact patch a better chance but I also just think you have too much rear grip. Next track event try running 44psi in the rear and staying at or around 40 in the front. It's a work around no doubt. 2" of wheel offset is going to be hard to deal with.
You could buy my 19x9.5/10's 3pc forged wheels with 275/285's . I'll make ya a sweet deal!
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11-05-2012, 04:50 PM | #17 |
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Oh and a 245 is a good size for 9" rim. The right tire size for your rims is 245/295. 2" = 50mm.
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11-05-2012, 05:27 PM | #19 |
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Clockwise tracks every time? If so, swap them side to side. 9" is plenty of rim for a 265, a 9.5 would be better but you're not going to get more grip going to a smaller tire, and a smaller tire will overheat faster.
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11-05-2012, 06:14 PM | #20 |
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255/35 AD08 is squared up on a 9.5" rim. They are a really fat tire per section width.
You bought Von Zoom's wheels?
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11-05-2012, 06:50 PM | #21 | |
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Just some ideas, but worth considering. |
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