Steering wheel vibration, 58-63 MPH...
04-07-2005, 06:34 PM
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Steering wheel vibration, 58-63 MPH...
anyone seen this before or solved it? With a loose grip and straight ahead we are getting steering wheel shake/vibration. It was mild on the B6 but bad with the B7 S4 and now a B7 A4 Avant. The S4 has been rebalanced with Hunter road force of 11 LF and 7 RF. The rears are junk at over 15 both but I don't believe that matters regarding this. The B7 A4 sedan we had was OK.
I'm figuring we aren't the only ones every to see this and wondering what the fix is. -Pete
I'm figuring we aren't the only ones every to see this and wondering what the fix is. -Pete
04-07-2005, 06:46 PM
#2
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I am aware that the hunter system can compensate for a bent wheel, but
It would seem that the likely candidate would be a bent wheel or defective tire. I would try to swap 4 differnt tires and wheels to see if that eliminates the problem. Otherwise, I might then look at suspension or steering components. Better yet, take it back to Audi and let them figure it out!
04-07-2005, 07:07 PM
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Wheels not bent. No problems with runout in either direction...
but I agree on the tires. My old B6 is there (traded) and it's smooth. May test those wheels on mine to see. -Pete
04-07-2005, 07:14 PM
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brakes rubbing?
I know my dads scubbie has an issue like this. They have spent a lot of time trying to figure it out. They think its the brakes rubbing. I would also say check the power steering fluid.
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04-07-2005, 08:06 PM
#8
I can almost guarantee that you have at least one wheel in each set that is not balanced/round.
There is no other explanation except maybe an out-of-balance brake rotor, which I can't say I've ever heard of.
04-07-2005, 08:17 PM
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Re: I can almost guarantee that you have at least one wheel in each set that is not balanced/round.
Why is it only happening at the 58-63 mph marker? The dealer has already rebalanced all my tires and it is still happening.
04-07-2005, 08:40 PM
#10
It's very common for vibrations to go in and out of phase, depending on speed.
I think that out-of-balance and out-of-round wheels don't vibrate as much as it feels like they do. It is unnoticeable until you reach a certain speed, when the frequency of the vibration finally meshes with the frequency of (fill in the blank) and it manifests itself as a perceptible vibration. A few mph higher, and the vibration's frequency goes out of phase with whatever it was in phase with and wallah...away goes the vibration.
But you've rebalanced all the tires, so maybe you have a tire that isn't round. There are also two types of balancers that I don't know the technical names of. One basically measures vibration on one plane, and the other measures vibration in two dimensions. The first one won't notice a heavy spot on the outside of the tire at 12 o'clock if it is counterbalanced by another heavy spot at 6 o'clock, even if that heavy spot is on the <i>inside</i> of the tire. I did a really sh*tty job of explaining that, but it's late; sorry. The second one is better.
But you've rebalanced all the tires, so maybe you have a tire that isn't round. There are also two types of balancers that I don't know the technical names of. One basically measures vibration on one plane, and the other measures vibration in two dimensions. The first one won't notice a heavy spot on the outside of the tire at 12 o'clock if it is counterbalanced by another heavy spot at 6 o'clock, even if that heavy spot is on the <i>inside</i> of the tire. I did a really sh*tty job of explaining that, but it's late; sorry. The second one is better.