Tire vibration / thumpping issue at track - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Topless · 08-03-2009, 10:13 PM

Lots of possibilities. Failing bearing, uneven tire wear, alignment problems, tire pickup, failed drop link or A-arm bushings, failed strut. You can check your bearing simply grabbing the tire and giving a yank left or right. You should not hear a clunk or feel any play in the wheel. Other suspension components are best checked on a lift where you can get a good look.

Brad Roberts is our local suspension Guru. He probably forgot more about Porsche suspension then I will ever know. Perhaps he will chime in.

renzop · 08-04-2009, 01:36 AM

Bad wheel bearing can be identified by pushing in hard on the tire at the top of the tire towards the center of the car. Use all your weight to do this. If the bearing is going bad you will feel a definite little click-click as you displace the outer bearing race.

986FortyEight · 08-05-2009, 07:41 PM

Different option: front engine mount.
I had the exact same problem at a PCA event at MSR and couldn't figure it out. everyone tried the car and identified the vibration to front right wheel. Not knowing was driving me insane! eventually got it on the lift at fifth Gear and saw immediately the front mount was toast. Replaced t and the vibration was gone. mystery solved.

Good luck, and let us know when you find the cause!

Mike

rob76turbo · 08-08-2009, 07:07 PM

I use Fifthgear too. Great folks. Can't wait to see their new facility.

I will take a look at the front motor mount when I have the car up on a lift.

986FortyEight · 08-09-2009, 11:55 AM

Quote:

Originally Posted by rob76turbo

I use Fifthgear too. Great folks. Can't wait to see their new facility.

funny story,my daily driver was having major issues and since it is not a Porsche I have neither the time nor the desire to mess with it so I dropped it off at 5th gear on Sunday night a week ago. When I got there there was only one old 911 in the front where there was 15-20 before and the building was vacant. Fearing the worst, I finally saw a note on the door mentioning the new facility accross the street. I walked over to the building I had never seen before and sure enough they were all scrambling trying to complete the move. I was their first customer in the new place!
It is such a major step up and looks awesome.

rob76turbo · 08-09-2009, 09:07 PM

Shook the cra% out of the front wheels. No slop, no clicking, no nothing. The bearings seem very tight.

Now we move back to the motor mount and....all chewed up. So I will be ordering a new Delrin Motor mount from Cheetah ($125) and probaly a new AOS as I noticed a lot of oil buildup around it. Get the car back up on the lift next weekend to take care of those two items. The bearings can wait! I will keep them frozen until then.....

Topless · 08-10-2009, 07:44 AM

Very interesting. This is the first I have heard of a failed motor mount causing clunking noise at the right front wheel. Good to know.

986FortyEight · 08-16-2009, 07:34 PM

Quote:

Originally Posted by rob76turbo

Shook the cra% out of the front wheels. No slop, no clicking, no nothing. The bearings seem very tight.

Now we move back to the motor mount and....all chewed up. So I will be ordering a new Delrin Motor mount from Cheetah ($125) and probaly a new AOS as I noticed a lot of oil buildup around it. Get the car back up on the lift next weekend to take care of those two items. The bearings can wait! I will keep them frozen until then.....

Called it!

Glad to know you got it solved! let us know how the wevo mount feels!