GruppeM question

Rated E · #1 (**permalink**) 08-31-2003, 07:30 PM

I installed my GruppeM a few days back.(on a 330Ci) and I notice at full throttle when the engine hits 5000rpms that is a weird high frequency vibration noise. It only seems to happen with the windows up. I was at bimmerfest today and had Jim from Ultima check everything over and he seems to think the intake is fine, but I was wondering if anyone had some similar type noise with anything. I can't imagine what this is, and I took apart the intake and put it together, but I really don't think it's that. However if anyone has any input about anything I would appreciate it. Thanks

E31 · #2 (**permalink**) 09-01-2003, 08:20 AM

Seems like it can be some type of resonance that comes from the vibrating box at high RPM's. I would try and put some of that foam tape where the box touches the car to dampen the vibration.

Rated E · #3 (**permalink**) 09-01-2003, 11:47 AM

I do have the foam tape supplied with the intake on every spot it touches. SOrry I should have mentioned that in my first post. That is the kind of sound it is though