Vibration Issue
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 1,107
Likes: 12
From: Baton Rouge, LA
Vibration Issue
My shark tends to vibrate at 50mph and up. This vibration is not noticeable at lower speeds and tends to amplify as speed increases. No odd vibration in neutral at idle (clutch out TT spinning). I can feel it in my seat and it is very prominent in the gear shift ****. Also, more acceleration equals more prominent vibration. For example, at a steady 60mph vibration is noticeable. Push clutch in and coast at 60mph and vibration is noticeable but not so badly transmitted through the gear shift ****. Ease up to 80mph and vibration eases up. Acelerate hard from 60 to 80+ vibration amplified even more through acceleration.
The only trouble shooting I've done thus far is with the CV joints/axels, they seem to be ok. I'm beginning to think I have a bent phone dial.
Any ideas?
The only trouble shooting I've done thus far is with the CV joints/axels, they seem to be ok. I'm beginning to think I have a bent phone dial.
Any ideas?
Rennlist Member
Joined: Mar 2004
Posts: 2,218
Likes: 10
From: Colorado
If you can feel it in your seat, and especially in the shifter, I would tend to believe the trouble is in the drive train rather than wheels or rotors. My tranny vibrates quite noticeably at almost any speed until it gets good and warm. Then it's smooth.
Drifting
Joined: May 2001
Posts: 2,747
Likes: 3
From: Owasso, OK
Check your wheels and tires. You could have lost a balancing weight or the radial belt in one of your tires may have broken and the higher rpm's will cause it to separate.
Dennis
Dennis
Last edited by Dennis Wilson; Nov 5, 2005 at 04:17 PM.
Trending Topics
Rennlist Stories
The Best Porsche Posts for Porsche Enthusiasts
Genius Porsche-Themed Gifts That'll Make Any Dad or Grad Smile
Joe Kucinski
10 Used Porsches Are Selling for Way Too Cheap
Joe Kucinski
Tuner Is Converting Porsche 911s Into Shooting Brakes
Verdad Gallardo
This Coachbuilt Creation Is A Modern Take on the Legendary Porsche 917
Verdad Gallardo
Is This Convertible Cayenne A Steal, Or A Returnless Investment?
Verdad Gallardo
10 Best Non-Flat Six Porsches You Can Buy For Under $100K
Joe Kucinski
Porsche's Top 5 Most Questionable Naming Decisions
Verdad Gallardo
Pogea Racing's 964 Porsche 911 Reimagination Stands Out in a Crowded Field
Verdad Gallardo
6 Convertible Top MYTHS Most People Don't Understand!
Michael S. Palmer
Rennlist Member
Joined: Feb 2003
Posts: 29,828
Likes: 218
From: saratoga, ca
that turned out to be a bad master cylinder the BMW i was referencing to on the thread.
you have to isolate the vibration. i had one that was seeming to be a drive shaft vibration, and it just turned out to be mufflers vibrating on the chassis.
try all the rpms, with clutch put in and clutch out (still in neutral)
MK
you have to isolate the vibration. i had one that was seeming to be a drive shaft vibration, and it just turned out to be mufflers vibrating on the chassis.
try all the rpms, with clutch put in and clutch out (still in neutral)
MK
Originally Posted by tv
Brake rotors warped? or there was a thread about the abs sensors doing something.
Rennlist Member
Joined: Oct 2003
Posts: 7,210
Likes: 17
From: Nova Scotia
Originally Posted by Scott C
If it is truly speed dependent and not RPM dependent, then I would check the half shafts between the transmission and rear wheels.
Addict
Rennlist Member
Rennlist Member
Joined: Nov 2001
Posts: 620
Likes: 0
From: Endwell, New York
Motor Mounts? Mine car would start vibrating (small vibration) at 55Mph and up until I replaced the Motor mounts. I'd check the simple stuff first, wheel balance, CV joints, etc.... Good Luck!
Thread Starter
Burning Brakes
Joined: Sep 2003
Posts: 1,107
Likes: 12
From: Baton Rouge, LA
My motor mounts are new. The TT has also been replaced recently. The vibration seems to be speed dependant. The vibration does not change much overall between 3rd, 4th and 5th and a steady speed. Tranny mounts are good. I'll try the simple stuff first and hope for the best.
Supercharged
Rennlist Member
Rennlist Member
Joined: May 2002
Posts: 18,926
Likes: 88
From: Back in Michigan - Full time!
I had a slight vibration on my car when I bought it and persisited after new tires that you could just feel at 45 then came back much harder at 80. I replaced rotors, pads, motor mounts, tie rod ends, and the vibration persisted (they needed to be replaced anyway - I didn't do because of the vibration).
This past friday after work I swung by the tire shop and had them road-force balance my front wheels, and they were off quite a bit off from their initial balance. I also had them measure the lateral and radial runouts pf the wheels and they were both within +-0.030" which is pretty darn good. They did not have to re-align the tire to the wheel. So with new weights properly placed, I was on my way - a smooth and happy camper.
This past friday after work I swung by the tire shop and had them road-force balance my front wheels, and they were off quite a bit off from their initial balance. I also had them measure the lateral and radial runouts pf the wheels and they were both within +-0.030" which is pretty darn good. They did not have to re-align the tire to the wheel. So with new weights properly placed, I was on my way - a smooth and happy camper.