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UberAvant
04-16-2013, 05:45 PM
I have read many threads on vibration. During take off I feel a suttle vibration directly under the car. What's the bottom line?

sbaer2
04-16-2013, 05:54 PM
could be rotors, uneven worn tire, axle, tire off balance/alignment ..etc....many things could cause it would have to be more specific. Might even be a drive shaft rubbing...happend in my brothers old 325I

UberAvant
04-16-2013, 06:00 PM
The vibration is felt immediately upon take off vibrating through the center of the underbody.

sbaer2
04-16-2013, 06:01 PM
The vibration is felt immediately upon take off vibrating through the center of the underbody.

hmm sounds like a drive shaft..my brothers issue was mostly felt in same location and when someone was sitting in back seat with feet on the floorboards you could feel it.

walky_talky20
04-16-2013, 06:17 PM
I agree. I would do an inspection of the universal joint in the center of the driveshaft, as well as the support bearing. From your description it sounds most likely to be the u-joint freezing up in 1 direction.

UberAvant
04-16-2013, 06:51 PM
The link below describe the issue.


http://www.blauparts.com/audi/audi_driveshaft/audi_quattro_driveshaft_repair_kit.shtml#trouble

98A4TurboAWD
04-17-2013, 06:58 AM
check your transmission mount.

ECS Tuning-Audi
04-17-2013, 08:59 AM
Can be tie rods as well. Is there any slop in your steering wheel? Like can you saw at the wheel pretty good while still continuing in a straight line?

Jason

grmnmusl
04-17-2013, 11:35 PM
Why are we still were having these discussions..... SMH!

Everyone upgrades engine and clutch first, few even look to the drive train. The issue is that most likely the rear diff/prop shaft is moving around more than it was in 2000-2002. As torque is increased and decreased under throttle input, the center bearing on the prop shaft and differential mount are trying to compensate and do thier job and most likely has some slop after years of abuse.

The drivetrain gets all this abuse from the mods we install but we dont look there.

http://www.youtube.com/watch?v=0csRp7fedwA

http://www.034motorsport.com/chassis...is-p-1214.html

http://www.034motorsport.com/chassis...s-p-13696.html

UberAvant
04-18-2013, 04:24 AM
My steering is perfect, no issues with the tie rod. The guy at the dealership mentioned that of all A4's he has seen most of them end up being the carrier bearing.

98A4TurboAWD
04-18-2013, 07:37 AM
yeah I remember when I first got vibrations. It was shortly after my SPEC stage 3 clutch install. I thought it was the clutch and chalked it up as chatter.

Eventually it got to the point where during takeoff the entire trans would bounce up and down.

The mount had actually split into two pieces by this point. Replaced the mount and it was good as new.

During takeoff, tie rods and suspension isn't going to cause vibration during takeoff. It's going to be a mount. On my Conquest years ago the same thing happened to the mounts but it was the two rear end mounts. Started as a slight vibration and when they finally totally split the rear end was lifting up and hitting the bottom of the car. It starts as vibrations though.

nizmosx
04-18-2013, 09:01 AM
could you be describing flywheel chatter? do you have a lwfw currently installed on teh car. If not check the driveshaft as others have recommended.