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Old 03-26-2010, 09:45 PM   #1
scottjua
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Default Tire wear... track guys can you tell me what's up?

After this past track day I noticed my right front (the one that took the most abuse that day) had something I haven't seen before in terms of wear.

This is a fairly new Advan AD07 that's seen 2-3 track days so far, and a few thousand daily driving miles.

here are a few pics, and I assume it's just from the abuse, but I've run basically the same alignment set up with the only change being in caster. I am now at +5.9 degrees caster, -1.7 camber up front.

I can't tell if this is just some type of graining, or actual structural blistering...???

Anyone? What can I do to alleviate the abuse to that outside shoulder even more? I hesitate to add more camber, as I do daily drive the car, and on the street they wear fairly evenly.

I know I can drive around it... and I try... but I can't help wanting to push it more.





just for kicks... here's some video from last weekend:

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Old 03-26-2010, 10:06 PM   #2
MasterKwan
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More camber. 2.5-3ish. I'd guess you're asking more of your tires than they can deliver in the corners and they're blistering. I think the sidewalls suggest the tire's rolling over too. What kind of hot pressure are you using? I'm thinking you need 40ish if not a little more.
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Old 03-27-2010, 02:15 AM   #3
scottjua
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I guess I have to revisit what kind of camber I can run and still get away with real world tire wear.

I run about 38psi hot in the fronts. Of course it varies depending, but I aim to keep it around there. I'll try a bit more up front and see then.

this past weekend was tough... it was SO cold with the wind, and I admittedly took my time before getting a pressure reading. By that I mean that I didn't come right off track and immediately check them, it took a few minutes before I got to them... I was more concerned with taking rotor temps, and actually took tire tread width temps too (which confirmed that outside should taking the abuse).
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Old 03-27-2010, 02:42 AM   #4
Web Foot STi
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I have run both the RE070 and Victoracers with -1.3 camber and to keep the roll over some what in check I run with 42 psi hot up front. 38 psi rear to balance things out. This is with 0.00 toe and 4.4 castor. Yes, I'm stock.

What toe are you running?
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Old 03-30-2010, 05:33 PM   #5
GLSTI
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This is a very weird tire wear. It don't think it's blistering, it just looks like graining from overuse. I don't think the tire is rolling over since the sidewall still looks good, so your alignment and tire pressure seems ok for your use.

Are you sure you don't have any toe in??
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Old 03-30-2010, 05:58 PM   #6
scottjua
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Toe is 1/32 in. I'm gonna have to definitely try some more pressure up front, and just adjust my driving to conserve tires more I guess.

I don't know if I could get away with -2.5 camber daily driven...
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Old 03-31-2010, 12:15 PM   #7
CincinnatiKid
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Not to jack your thread, but I'm curious on opinions of this. Brand spanking new tire, still had stickers, after a day at mid-ohio, this is the front left.
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Old 03-31-2010, 12:21 PM   #8
rinsed
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^^overinflated perhaps? Looks to me like the middle is worn more than the edges...
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Old 03-31-2010, 12:32 PM   #9
CGMDan
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^^^ Maybe overinflated, but the camber is a bit off as the right side is more worn than the other. Your also running full tread depth so you're getting a fair amount of tread squirm which is causing the rolled rubber on the inside of the tread blocks.
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Old 04-03-2010, 10:41 PM   #10
JDwhiteWRX
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That photo tells me you are driving on the outside edge of your tyres.

My car has -2 camber up front and is my daily driver (tracked on weekends), I have 5 degrees caster and zero toe all around.
I get even tyre wear with maybe a little wear on the outside edge still. With your setup you could get away with around -2.2 and still get even tyre wear I believe, the trick is keep the toe at zero, toe is what seems to kill tyres.

I will be adding a little more neg camber at my next alignment.
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Old 04-03-2010, 10:51 PM   #11
dowroa
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I don't know your rates, but on every Subaru I have ever driven in anger, I always run -2.75 degrees to -3.00, depending on rate and tire. With my RE01Rs, I am running -2.9 on rallyX springs. If you are running on stock springs/struts, I am hoping you are at least up there.

As for daily driving, this is easily doable, doesn't kill tires, and I have been doing it for 5-6 years now.

I would like to see pictures and depth readings across the tire, as that is my guess. I never hit the outside blocks like that, anymore.

- dow
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Old 04-03-2010, 10:54 PM   #12
JDwhiteWRX
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dowroa, what camber settings do you run in the rear with the -2.75 up front?
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Old 04-03-2010, 11:04 PM   #13
dowroa
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JD:

Not to thread jack this too much, but it depends on the rate of the car. With the rallyX setup I am running right now, I am running 0-rear camber so the car will rotate. I tested this at ViR Patriot, and it is probably a little too extreme. For what the OP is doing, it isn't as relevant as he has an STi transmission, and those act a lot different than the 5 spd I currently have.

Regardless, with lessened rate, I use the rear camber and smart driving to get the car to still rotate and always run around -2.75 to -3.0 up front. After watching the OP's video and knowing his car, I would be running -2.9 and -.5 to -.75 in the rear on stock springs/dampers with RE01Rs. That is just me, and the course was pretty flat, compared to ViR, where I would run more rear camber to keep the car planted on the uphill esses.

- dow
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