Boxster grinding vibration from rear

[mikstew]

I went to an autocross the other weekend, and on that day my 1999 boxster developed this terrible grinding from the rear when turning at speed or under load. I've had the entire suspension checked over for play and was told it all looks good. CV shafts were checked as well.

Thoughts on what this noise is? It is not just a noise, you can also feel the grinding taking place. The noise and feeling is very noticeable. IT is not like a small differential whine. See in the video:


https://youtu.be/zK82lWOLpYQ

[Jim & Kim 986]

I couldn't tell a lot from your video.

Can you FEEL it in addition to hearing it?

Check your main (front) motor mount. When they fail completely it's an "all of a sudden" thing.

[Brian in Tucson]

Originally Posted by mikstew

I went to an autocross the other weekend, and on that day my 1999 boxster developed this terrible grinding from the rear when turning at speed or under load. I've had the entire suspension checked over for play and was told it all looks good. CV shafts were checked as well.

Thoughts on what this noise is? It is not just a noise, you can also feel the grinding taking place. The noise and feeling is very noticeable. IT is not like a small differential whine. See in the video:


https://youtu.be/zK82lWOLpYQ

My best guess would be a bad hub bearing. Jack it up and check the rear wheels for axial play. Usually motor mount is a clunking noise, and a bad cv joint is too.