Tire wear problem - TCCoA Forums
 
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post #1 of 11 (permalink) Old 01-29-2008, 09:51 PM Thread Starter
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Tire wear problem

I have 255/45r17 Cooper Zeon tires on my 92' Cougar. It seems I don't get any life out of the tires. (less than 10k) While the bald back tires are kinda self-explanatory, the fronts are what bother me. With the last two sets of tires, the inside of the front tires have worn significantly faster than the rest of the tire. In fact, 95% of the tire looks like new. I know alignment would be the first thing that would come to mind, but since the last set of tires I have had the alignment checked and it was right on the money. All I can think is that a) I'm cornering way too fast b) the suspension geometry and my 9" rims are incompatible or c) a combination of both.

Anyhow, my question is this, does anyone have the same problem running similar tires on a similar rim? I mean, I'm not getting much more than 10k out of good tires, they aren't made of soft rubber either... and at over 600$ a set I can't afford to replace them every year!

90' Cougar Sport Edition 3.8 (RIP)
92' Cougar 25th Anniversary Edition 5.0
96' Contour Sport (RIP)
01' Jaguar XJR
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post #2 of 11 (permalink) Old 01-30-2008, 02:52 AM
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I would recomend taking a much closer look at your car...I don't know how mechanical you are but you might be able to inspect your car better than most shops. If thats not an option...

Take it to a shop that specializes in front end work. An actual Frame shop, recomended by say a local body repair shop or something. This is how I found the best front-end guys in our zip code.

I am sure that there are some great front-end guys out there at the local tire shops. But for the most part I have heard ALMOST nothing but horror stories with respect to this service arena in the tire business. Its tough to find a tire shop with a GOOD front-end service and even tougher to find one that is GREAT.

Cheers,


Brad

1990 & 1994 SC's
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post #3 of 11 (permalink) Old 01-30-2008, 05:30 PM Thread Starter
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The alignment was done at a body shop... by a friend of mine.

But... I could have them take a closer look.

So... any ideas why it might be rubbing off only the inside of the tire?

90' Cougar Sport Edition 3.8 (RIP)
92' Cougar 25th Anniversary Edition 5.0
96' Contour Sport (RIP)
01' Jaguar XJR
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post #4 of 11 (permalink) Old 01-30-2008, 06:21 PM
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Alignment is obviously not the be all of a good front-end. A shop worth its salt will look past the alignment and check the condition of parts at least giving you a good starting point to a solution.

I don't see any online solution to your problem but thats just me.

Its not the alignment...Its not the tires...Mkay...So as long as you keep ruling out possability you should eventually have a solution. Its been my exp. that there is never a single/simple solution to a front-end problem.


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post #5 of 11 (permalink) Old 01-30-2008, 06:30 PM
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Camber or Toe.

But I really vote for Toe. Do you have the specs for what the alignment shop set it to?
Is the steering real touchy? Very responsive? Overly so.

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post #6 of 11 (permalink) Old 02-04-2008, 10:42 PM Thread Starter
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See that's just it... I used the specs from the front page of this site... (which are the stock specs btw)

It does bump steer a bit and the car is lowered an 1.5"... so maybe the TCCoA (stock) specs are bad???

90' Cougar Sport Edition 3.8 (RIP)
92' Cougar 25th Anniversary Edition 5.0
96' Contour Sport (RIP)
01' Jaguar XJR
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post #7 of 11 (permalink) Old 02-05-2008, 07:05 AM
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If you are using these:

http://www.tccoa.com/articles/suspen...ent/index.html

Refer to this quote by fast Ed:

Quote:
Originally Posted by fast Ed View Post
IMO the alignment specs in the tech article here on TCCoA are way too much for a street driven MN-12 car. They do not need that much negative camber. Especially on a lowered car, which is getting into the bigger part of the curve of the suspension travel.

I tried those settings when I first lowered my car about 4 or 5 years ago, and had 17" wheels installed. This was when the car had less than 50,000 miles on it, all of the suspension components were in good shape. All I succeeded in doing was taking the inside half of the tread off my front and rear tires. I have since gone back to pretty much stock range alignment settings, about 0.8 neg. camber in the front, and 0.5 neg. in the rear. This is plenty for an MN-12 car, their superior suspension design does not require a bunch of camber to keep the tires flat under hard cornering. That's that the main benefit of having the SLA susp. design. The only time I have found my car could use maybe another quarter or half degree of negative camber is when I'm running at the open-track events, on very sticky race radial tires. Even at those events, the tires are not rolling over on to the sidewalls, as might be the case when not enough static negative camber is dialed into the car.

cheers,
Ed N.
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post #8 of 11 (permalink) Old 02-05-2008, 08:38 AM
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Toe

Hello

I would start with the toe. It is harder to see by eye.
With a lowered car or wider tires, there might be too much Ackerman steering input into the car.

Does the car seem to wander A little on the expressway?

Paul

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post #9 of 11 (permalink) Old 02-05-2008, 09:48 AM Thread Starter
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Miller, good info! I believe I did use those specs and it seems like I am having a similar problem to the one that Ed is describing. Then again, I'm not taking half of the tread of the fronts, but only the corners or about 5-10% of the tire surface. Except for the insides, 90% of the tire looks like new. But the wear is bad enough that they won't pass inspection.

Paul, you might be right, but the car is pretty stable on the highway. Bumpy roads are more a problem... as in certain roads produce undesired steering inputs.

90' Cougar Sport Edition 3.8 (RIP)
92' Cougar 25th Anniversary Edition 5.0
96' Contour Sport (RIP)
01' Jaguar XJR
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post #10 of 11 (permalink) Old 02-05-2008, 09:57 AM
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So you have 2 votes for toe.
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post #11 of 11 (permalink) Old 02-05-2008, 11:37 AM
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Toe

Hello

Don't forget that Bad or soft Strut rod bushings will affect toe directly.

With soft strut rod bushings, when not in motion the numbers are good.
But went in motion the soft bushings deflect & the toe increases.

Remember there are 2 sets of strut rod bushings. At the frame & at lower control arm.

Paul

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