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Old 02-21-2006, 04:16 AM   #2
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Join Date: Feb 2005
Location: PA
Posts: 3,979
My Ride: 330ci
ok i will take a crack at it before the engineers wake up. this could be it, or it could not be. i dont know

when a car runs though it vibrates and such at a certain frequency. my roomate had to figure out a better belt system on a ford than it comes with. by better the frequency was supposed to be in tune so that it runs silently and doesnt cause a harsh vibration and such. i dont know much about it but i would guess (see sig) that perhaps at that engine speed the vibration is such that it hits a harsh spot with other resonance in the car, giving you a vibration at a certain rpm/mph

my exhaust system rattles a bit just at a certain rpm, a low one although i never checked exactly

well if thats complete BS at least you and i were entertained for a minute
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