Vibration through the floor when placing under load

4.2 V8 40v biturbo - 450 bhp
4.2 V8 40v biturbo - 480 bhp (plus)
Post Reply
buzzard666uk
Neutral
Posts: 17
Joined: Tue Nov 03, 2009 9:28 pm

Vibration through the floor when placing under load

Post by buzzard666uk » Tue Nov 03, 2009 10:05 pm

Hi,

Have an RS6 saloon on an 02 plate.

Recently had a drive shaft replaced and gearbox rebuilt after I put the car into Audi for what I can describe is an increasing vibration coming through the floor from 35mph onwards....the faster I go the worse it gets.

You can feel it slightly through the sterring wheel, but very apparent thru the pedal, floor and seat, and in tha order.......and you go faster....

Now, although I had all the above changed, and have previously replaced rea shocks and all DRC valves etc........ it still vibrates, even more so in a left hand bend vs a right hand....

Anyone had any such issues ??

thanks.

slimmyreed
2nd Gear
Posts: 118
Joined: Wed Dec 31, 2008 2:40 am

Post by slimmyreed » Wed Nov 04, 2009 4:12 am

sounds like something is out of balance. I take it that as you have had the driveshaft replaced and the gearbox rebuilt you have ruled out the most common cause of vibration, wheel & tire balance?

Another cause that has been known (not specifically to the RS6 though) is the propshaft can become out of balance, but this is rare as the balance weights are normally welded on...

tartan_rob
Cruising
Posts: 2990
Joined: Thu Sep 04, 2003 1:45 pm
Location: Swindon, Wilts

Post by tartan_rob » Wed Nov 04, 2009 10:14 am

The centre bearing on the prop shaft goes. It is welded on also and therefore not easy to change. Taking it off to check is an easy job, if you can get the thing into the air. Failing that you may be able to undo the centre bearing mounting bolts and check for play. In any case a new shaft is circa £800 + fitting.
2017 Kawasaki Z1000
2014 RS6
2014 S1

buzzard666uk
Neutral
Posts: 17
Joined: Tue Nov 03, 2009 9:28 pm

Post by buzzard666uk » Wed Nov 04, 2009 1:21 pm

Guys, thanks for the replies..... having the wheels re-checked later today but by a different vendor... the car is in Audi dealership next Monday and trying to narrow down the number of potential sources of the fault. Keep the ideas coming folks, please..

thanks...

mattler
3rd Gear
Posts: 433
Joined: Sun May 03, 2009 10:57 pm

Post by mattler » Wed Nov 04, 2009 8:42 pm

Steering? Had a similar problem on my old BMW 850Csi and after spending a god damn fortune it turned out to be the steering rack, or steering box in that case and cost me 2k plus fitting

User avatar
Shoppinit
Cruising
Posts: 20318
Joined: Wed Dec 31, 2008 6:24 pm

Post by Shoppinit » Wed Nov 04, 2009 9:02 pm

Bent alloys?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

buzzard666uk
Neutral
Posts: 17
Joined: Tue Nov 03, 2009 9:28 pm

Post by buzzard666uk » Wed Nov 04, 2009 9:23 pm

thanks for folks replies...

Just found out tonight that three wheels are "distorted" !!!!

so now i've got to find new ones....... recommendations or anyone got 4 (yep, want one as a spare) original Audi wheels....

User avatar
Shoppinit
Cruising
Posts: 20318
Joined: Wed Dec 31, 2008 6:24 pm

Post by Shoppinit » Wed Nov 04, 2009 9:28 pm

Did they make hard and soft alloys like for the B5 RS4? The soft ones were replaced FOC if they buckled.
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."

Post Reply

Return to “RS6 / RS6 plus (C5 Typ 4B) 2002-2004”

Who is online

Users browsing this forum: Bing [Bot] and 127 guests