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Old 10-18-2005, 10:11 PM   #1
sick1.8t
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Default shimmy that goes away at 70mph?

i bought a legacy a few days ago and i'm trying to figure out where this vibration is coming from.
it starts at about 50mph, and gets progressivly worse until 68mph, then by 70 its totally gone.
the previous owner says that it used to happen from 65 to 80 then he replaced a front cv joint and the shimmy shifted to where it is now. but who knows, he could be wrong or he could be lying.
if it was a misalignment, the vibration would just get worse and worse and never go away right?
could it be a unbalenced wheel? possibly the centerfugal force of the wheel above 70mph is greater than the amount that it is unbalenced?

has anyone ever had symptoms like this and what solved it?
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Old 10-18-2005, 10:29 PM   #2
Caliber
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Misalignment will never cause a vibration unless it is so far out it would kill the tires in a matter of miles.

You're more likely looking at front wheel balance being off. Go ahead and have all 4 wheels balanced.
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Old 10-18-2005, 10:42 PM   #3
2slofouru
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Mine does that and I've had the wheels balanced a few times since. I've also had it aligned as well and had the wheels rotated. My CV shafts are NEW not rebuilt. I will be changing the rack and bushings asap and the big control arm bushings when I can get it in the air. Oh, and also had the front wheel bearings changed a few months ago and new rotors with calipers from a legacy. All done trying to get rid of the shimmy. I now have a shudder as well, since changing the CV's to new.

Last edited by 2slofouru; 10-18-2005 at 10:57 PM.
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Old 10-18-2005, 10:52 PM   #4
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My guess is a wheel bearing.

My L did that when I first got it and had to replace left rear wheel bearing. Went away after that.

-Derek
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Old 10-19-2005, 11:10 AM   #5
sick1.8t
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there is another, possibly related, thing going on with it too. at low speeds (15mph) i noticed a rocking/bouncing sensation that was slow and seemed to be going with the rotation of the tires. i need to do a little more driving before i know its exact characteristics. that makes me think it could also be a bent wheel. maybe its the bent wheel going around and around. i dont have alot of expirience with wheel bearings, but if i had a bad one, would it really allow this much movement?
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Old 10-19-2005, 03:09 PM   #6
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hmm,hard to say. Jack your car up and grab each tire, one had on the top of the tire and the other hand on the bottom, push and pull the tire as if you are trying to add positive and negative camber. If it feels like there is play you may have a bad wheel bearing.

I know this may have been confusing but it really isn't easy for me to explain.

If you have a bent wheel, a shop may be able to fix the problem by re-balancing it.

Good luck.

-Mac
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Old 10-19-2005, 03:39 PM   #7
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It is more than likely a tire issue. Either the tire needs to be balanced (possibly high speed balanced), the tire is out of round, or you have a bent rim.

High speed balancing is alot more precise when it comes it adding/removing weights. If the tire is out of round, (or even "cupped), balancing it will not fix the problem. It may balance perfect, but you need to watch it on the tire machine. If it wobbles at all, either you have an out of round tire, or your rim is bent. Depending on the severity of the tire or rim will depend what speeds it happens at. It is probably happening at lower speeds, just not enough for you to feel it. Once you hit the right speed, it starts, then the tire goes fast enough that the "vibration" stops because the "out of roundness" is small enough the rotations of the tires can overcome it.

Whew....enough of that...my head hurts
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Old 10-20-2005, 10:25 PM   #8
sick1.8t
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i jacked up one side of the car today. neither of the passenger side wheels have play in them (bearings), BUT the rear tire is severly cupped. the inside edge of the tire is showing belt for about an 8in section, then nothing, then again in another 4in section, then the whole other half of the tire is fine. i have not checked the other tires.

what would make the tires cup in the rear? i thought that bad aligment was the cause for front tires, but can the rear be aligned? is it a bent steel rim possibly?
i can get new steelies, but i dont want to have the same thing happen to them.
(lets assume its a bent rim) i can put on different wheels, problem solved.
(lets assume its not a bent rim) i can put on different wheels, car may drive fine, i find out in 2 months when my tires are cupped as hell and that i still have the problem. it costs me a set of wheels and new rear tires.
get me?
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Old 10-21-2005, 03:41 PM   #9
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Cupping is usually caused by a broken part especially a bad bearing but it can also be caused by severely out of balance wheel.
John
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Old 10-21-2005, 04:20 PM   #10
sick1.8t
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i suppose they could have just been out of balance.
i looked around at the suspension while i had the wheel off and nothing appeared to be obviously wrong. i suppose something could be out of alignment by a couple degrees without me knowing it, but there was no bent parts of crash damage repair that i could see. i still have to check the other side too.
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Old 10-21-2005, 04:50 PM   #11
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yeah I'd take your car in to get the wheels balanced and prob change out that tire just to be safe.

good luck with your car

-Mac
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Old 10-21-2005, 10:55 PM   #12
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If I were him, I would change out all four...remember...AWD!

If you only change out 1 or two at a time, you risk damaging the AWD down the road.

Also, not rotating the tires can cause them to wear as well, mostly on the insides. Have the tires been rotated regularly??
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Old 10-21-2005, 11:04 PM   #13
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the tire will need to be replaced anyway, its down to the belts in the areas where the cupping is. my only hesitation on that is i may be putting good tires on a bent rim, which will lead to the same demise as the previous tires.
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Old 10-22-2005, 11:24 AM   #14
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my car did the same at identical speeds. my tires were balanced fine, but there was still a flat spot or warp in the tread. that fixed it right away! sound like a tire issue, let us know!
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Old 10-22-2005, 09:00 PM   #15
sick1.8t
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i briefly looked at the other rear tire and wear seems pretty even. it looks like its just that passenger rear tire. the rears are both more worn than the fronts so i'll probably buy 2 used tires at the salvage yard so that they all have the same wear on them.
as soon as i have $85 to get two tires bought mounted and balenced, i'll let you know.
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