? Tire wear - alignment question ¿
02-14-2002, 09:20 AM
#1
Burning Brakes
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? Tire wear - alignment question ¿
While working on my brakes I noticed some extra wear on the inside of my right front tire - about 10k miles on tires and alignment.
¿ Am I correct that this is normal due to the factory setting for alignment ?
¿ Am I correct that this is normal due to the factory setting for alignment ?
02-14-2002, 09:32 AM
#2
Racer
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No this is not normal. SO how does the car steer. Does it wander? or pull?
Your car should be able to shoot down a road at whatever speed you desire and track straight! No tire wear. You may want to look at the camber in both wheels it is possible that the two nuts on the lower control arm are a little loose and allowed the camber to move. Compare each side with a carpenters square and ruler. Measure the rim not the tire.
Your car should be able to shoot down a road at whatever speed you desire and track straight! No tire wear. You may want to look at the camber in both wheels it is possible that the two nuts on the lower control arm are a little loose and allowed the camber to move. Compare each side with a carpenters square and ruler. Measure the rim not the tire.
02-14-2002, 10:09 AM
#3
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It's "normal" only because there are so few shops that know how to align a 928 properly.
If a 928 is jacked before or during alignment, the alignment will be WRONG. The front wheels will have toe-OUT rather than toe-IN, leading to exactly the tire wear pattern that you have.
You almost certainly need the toe reset. You can do this yourself, or you can try to get the shop that did it wrong to do it right - but they probably won't.
When you talk to the alignment tech (not the counter person or the service writer)make sure that they know and believe that they can NOT jack the car to zero their equipment, or to check the condition of the front end, or for any other reason. If they tell you that they can jack the front and then "settle" it by bouncing it, run away!
There are two ways to settle the front end after jacking: Drive at least five miles; or use the Porsche Shop Manual method of pulling the front end down with a special tool for a specified amount of time. Nothing else works.
If you want to prove this to yourself - or to the shop - measure the distance from the front fender lip to the ground. Jack the car so both front wheels clear the ground,let it down,and remeasure. Bounce on the fender as long as you want, and remeasure. Let the car sit overnight and remeasure. Drive five miles and remeasure. Convinced?
If a 928 is jacked before or during alignment, the alignment will be WRONG. The front wheels will have toe-OUT rather than toe-IN, leading to exactly the tire wear pattern that you have.
You almost certainly need the toe reset. You can do this yourself, or you can try to get the shop that did it wrong to do it right - but they probably won't.
When you talk to the alignment tech (not the counter person or the service writer)make sure that they know and believe that they can NOT jack the car to zero their equipment, or to check the condition of the front end, or for any other reason. If they tell you that they can jack the front and then "settle" it by bouncing it, run away!
There are two ways to settle the front end after jacking: Drive at least five miles; or use the Porsche Shop Manual method of pulling the front end down with a special tool for a specified amount of time. Nothing else works.
If you want to prove this to yourself - or to the shop - measure the distance from the front fender lip to the ground. Jack the car so both front wheels clear the ground,let it down,and remeasure. Bounce on the fender as long as you want, and remeasure. Let the car sit overnight and remeasure. Drive five miles and remeasure. Convinced?
02-14-2002, 10:29 AM
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Burning Brakes
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Thanks for the replies, just as I expected.
It was done over two years ago at a Porsche dealership when I first got the car. Back then it was jumping and moving all over the road. So it was a great improvement. Sounds like they got close but not good enough. Maybe I hit a hole or something but kind of doubt it.
Almost time for new tires anyway so I will have it done then - at a different Porsche shop.
It was done over two years ago at a Porsche dealership when I first got the car. Back then it was jumping and moving all over the road. So it was a great improvement. Sounds like they got close but not good enough. Maybe I hit a hole or something but kind of doubt it.
Almost time for new tires anyway so I will have it done then - at a different Porsche shop.
