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Old 05-07-2007, 12:40 PM   #1
ILSMKU2
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RIP 11, 09, 06, 03 STI's

Default Feathering or Cupping?

Hey all,

I have a 06 STI with about 12k of miles on it. When I 1st got the car I immediatly noticed how much louder the tires were compaired to my WRX. The dealership told me thats normal, since STIs dont have any sound installation stuff. However I noticed that NONE of my tires had any wheel ballances on them??? SO I brought my car back like 2 days later and had them put them on. It helped, but they were still loud. Since then, I have rotated my tires 3 times. I recently noticed more road noise than normal again. So I took a look and my rear passanger side tire looks feathered or cupped. Every OTHER thread on the inside of the wheel is higher. Meaning one thead is worn, the other is higher, then worn, then higher. Its not that bad yet, but you can kinda see or feel it. My alignment seems fine...the car goes straight. And my tire pressure is where its spos to be in all tires.



My question is this. If the car is stock, and I have rotated my tires, then what could cause this? Im asking because Im about to take it into the dealership for them to take a look, but dont want to get the age old, its your fault excuse.


Thanks all,
DJ
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Old 05-07-2007, 12:42 PM   #2
SiFuSpEc
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wait, you bought the car, without wheel weights on the wheels?

thats simply just previous owner driving around and you driving around with unbalanced wheels

i think, unless your rim/rims are bent or theres too much PSI in the tires and they've been ridden like that for a period of time..

Go get an alignment check and make sure all the specs are within factory specs and you will eventually have to replace those tires or the noise will just get worse and the ride will get bumpy
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Old 05-07-2007, 12:45 PM   #3
ILSMKU2
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Originally Posted by SiFuSpEc View Post
wait, you bought the car, without wheel weights on the wheels?

thats simply just previous owner driving around and you driving around with unbalanced wheels

i think, unless your rim/rims are bent or theres too much PSI in the tires and they've been ridden like that for a period of time..

Correct. I bought the car brand new from the dealership at like 8PM. It was dark, I was tired of being there and I took the keys and went home. During my trip home I noticed the road noise. The following day I didnt see any weights on the rims. At that point I took it back in and they put weights on them.



Tire presssure has always been correct. Bent rim, I hight doubt. Only because my car has only seen street and I dont remember ever hitting a pot hole or anything like that.
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Old 05-07-2007, 12:50 PM   #4
SiFuSpEc
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Alignment check ASAP!!!!!!! I forgot you bought this car new.. yes go back to dealer and get a check, and if its off, make them pay for replacement tires..
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Old 05-07-2007, 01:03 PM   #5
ILSMKU2
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Originally Posted by SiFuSpEc View Post
Alignment check ASAP!!!!!!! I forgot you bought this car new.. yes go back to dealer and get a check, and if its off, make them pay for replacement tires..

Yeah, I guess alingment check is in order. I highly doubt they will cover anything though. They always give me a hard time. And Im sure they will argue that I rotated my tires since I did it myself. At Franks Irvine Subaru, you're guilty until proven innocent.

I guess I will just have to get an alignment check done and go from there.
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Old 05-07-2007, 01:33 PM   #6
flukewrx
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Feathering (Cupping) is typically caused by your suspension. It is possible to have the alignment be dead on and still have Feathering (Cupping) occur.

What is typically happening is your Strut (Shock) is weak or dead. Instead of the bumps of the road being absorbed by your suspension, your tires are taking the blunt of the situation. Think of it like a basketball that is being dribbled up and down while your car is driving. On a new, properly working, strut (shock) the strut will be keeping the tire pressed against the road. When it becomes weak or dead it no longer is able to keep the tire firmly pressed against the road and the tire is no allowed to "hop" which then causes the feathering (cupping).

Typically you will get something around 75K miles out of the stock struts & shocks on MOST OEM vehicles. However, depending on the driving conditions the life of the strut (shock) can be severly shortened. My guess though is that you may have a situation where you ended up getting a defective unit. Also, since you said it is only on the Passenger Rear that you are noticing any feathering (cupping).

At this point, you will probably want to have the suspension upgraded before you get new tires or else you will probably end up toasting the new tires in the same way.

Last edited by flukewrx; 05-07-2007 at 03:54 PM.
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Old 05-09-2007, 02:26 PM   #7
ILSMKU2
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Update...

Took my car in. Spent 4hrs there waiting! Car needed an alignment. Got the alignment done and tires rotated at no charge.

But wait... I drove it home and its much quieter. But I also noticed one of my wheels (not the one with the cupping) didnt have a ballance on it! Dammit!

Called dealership back and asked why it wasnt on and or if they reballanced all the wheels. They said they didnt touch the ballances. So now I got to go back and have them put a ballance back on one of the wheels.

You would think they would notice a wheel was missing a ballance! Hello McFly!


ARGH...what a PITA.
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Old 05-09-2007, 10:14 PM   #8
pornie
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Quote:
Originally Posted by djennison View Post
Every OTHER thread on the inside of the wheel is higher. Meaning one thead is worn, the other is higher, then worn, then higher.

Thanks all,
DJ
Not to be an asshat, but how are they worn? is the front of the shoulder tread block lower than the rear or vice versa? how is the rest of the tire? what are your before and after alignment specs?
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Old 05-09-2007, 10:22 PM   #9
ScoobyNubieToo!
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Originally Posted by djennison View Post
Feathering or Cupping?
Answer: Things gay guys do to each others balls.......
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Old 05-10-2007, 02:20 AM   #10
ILSMKU2
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Originally Posted by pornie View Post
Not to be an asshat, but how are they worn? is the front of the shoulder tread block lower than the rear or vice versa? how is the rest of the tire? what are your before and after alignment specs?
Im not sure I understand your question?

If you rubbed your finger over the top of the tire treads, it would feel taller, shorter, taller, shorter on the actual treads. On the inside of the tire. Rest of all other tires were fine. And its not that bad.

Ended up being that my rear alignment was off and the toe was pointing inward on the passenger rear tire. All tires rotated and everything feels fine now.
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Old 05-10-2007, 02:20 AM   #11
ILSMKU2
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Quote:
Originally Posted by ScoobyNubieToo! View Post
Answer: Things gay guys do to each others balls.......
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