High g-force racket
 

Hi folks, I have a new issue with my '99 Boxster. I can recreate the issue as follows. If I go to a big dry parking lot and go around in big 360's as the speed and G-forces increase the car will start to have a 'fouling' or interference sound coming from what I think is the rear. If I turn the wheel sharper the sound (severity) immediately increases. So, higher G-forces cause it. I thought it might be a bad CV joint on a rear axle so I replaced the passenger side axle with (hopefully) good used one. No effect at all. It makes the sound turning left or right. I discovered it while driving on my fave twisty road (Angeles Crest Hwy around LA). I haven't a clue what it could be. Wheel bearings feel fine. Car has 102k miles. Manual transmission. Any thoughts?

Done anything to the oil pan? Baffles? Deep sump pan? All that oil sloshing to one side in a 360 can't be good. Just ask those who race the cars.

Hello there,

No I haven't done anything to the oil pan, nor do I drive in 360's! I was describing how to replicate the problem hypothetically. I discovered the sound on my local twisty roads. No sustained g-forces for very long. I've campaigned 3 race cars. This is my street car, it's stock, no mods.

I'm thinking it has to be wheel bearings.

Thank you,

Steve S.
Los Angeles