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Suspension and Chassis Questions about your suspension? Need chassis advice?

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Old 07-19-2001, 11:41 AM   #1
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Join Date: Mar 2000
Location: Orland Park, IL, USA
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Car: 88 IROC-Z
Engine: L98
Transmission: TH350
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Front tires going bald on the outsides, help please

Why is it that all 3rd gens and even some 4th gens have a tendency to wear the crap out of the outside edges of the front tires?? i have had 3 alignments and had the ball joints replaced and it still wears the outside edge. especially on my passenger side tire. what isgoing on? Ill be the first to admit that i like to take corners fast, really fast, and i definitly brake as late as possible, im a spirited driver. but taking hard turns shouldnt cause the kind of wear that i am experianceing. the tires have been on the car for less then a year and i have to go get a new one today for the passenger side front. Please help with any alignment/front suspension tips that you have to correct this problem.

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1988 IROC-Z L98
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Old 07-19-2001, 05:12 PM   #2
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Align it at a different shop. Also check the balance. The other thing it could be is that the strut mount might be moving, I know these cars a prone to rust right there. Make sure tire pressure is high enough, because it might be rolling over. Also check the sidewall for wear, because that will tell if the tire is flexing. The other thing you can do is replace the bushings in the front of the car. Now that I think of it, that is probably your problem. The suspension and roll bar could be flexing enough that the tire won't stay where it's supposed to. Also make sure that the steering linkage is tight. That's all that I got.

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Old 07-19-2001, 07:18 PM   #3
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Maybe you've already looked but, for what it's worth, I think I've seen some posts in the archives which give none stock alignment specs that are supposed to help prevent this problem. I have to look them up myself as the same thing keeps happening to my tyres as well.

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Old 07-19-2001, 07:22 PM   #4
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Tgere have been a lot of posts about this problem in the last few months. Do a search here. Try using "tire wear".

I too had this problem, and from what I understand, it is very common with agressive driving. Even the tire company (tirerack.com) said the same thing. I had my camber adjusted to stock specifications (0.30 0.50), and that was the main problem. From what I learned here, I re-adjusted my camber to -0.4. This sets the wheel tilting in more at the top than stock.

From everything that was posted, the following is what I currently have and so far it's working okay.

CAMBER: -0.5
CASTER: +4.5 (struts will be almost all the way rearward)
TOE: 0 to -1/16

If you are very aggressive, I'd start out with -0.5, and if you less aggressive, try -0.2 to -0.4. With this much camber, keep an eye for excessive wear on the insides of the tires now. It's also important that toe is correctly adjusted. Stock is also 0.0, but mine was off just a little, and that contributed to the problem too.
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Old 07-19-2001, 07:38 PM   #5
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What he said 100%. Stock alignment specs are terrible for an agressive driver.


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Old 07-20-2001, 12:35 AM   #6
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thanks a ton for the info guys, now to find a shop that will do non-factory spec alignments Click the image to open in full size.
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Old 07-20-2001, 02:34 PM   #7
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Most shops around here will do it--talk to the tech, not the person at the counter. The people at the counter get confused.

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350 with stealth intake, holley carb, 470 lift cam. 700r4 with .5 boost valve, vette servo, tci lock-up kit, B&M megashifter. Richmond 3.73 gears, powertrax locker, timkin bearings, synthetic lube. Custom 3 inch single into 2 2.5 pipes. 1 1/2 drop springs, 1 5/16 solid front sway bar, 1 inch rear bar, custom subframe connectors, custom LCA relocation brackets. Kobel ground FX, current red metallic paint. Lots of other stuff...
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Old 07-20-2001, 10:29 PM   #8
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I wear mine out too. To compensate for aggresive driving style I run about 1 degree negative camber and it wears the inside and outside edges pretty even. I don't get more than a year out of a set of tires, Z rated or not. The Z rated tires don't have as much tread to begin with and are a harder compound. The last set I bought were H rated and they are lasting a little bit longer and i like the softer compound more than the stiff sidewalls.
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Old 07-20-2001, 10:29 PM
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