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      06-16-2007, 11:27 PM   #48
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Drives: 2007 E90 335xi
Join Date: Jan 2007
Location: Jemez Mountains

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Originally Posted by murellus View Post
yes your ears feel a pressure change but it's very small, a couple psi at most. 10psi vacuum over the upper surface of the car at highway speeds would be bad bad bad.
My estimate was 10 psf, not psi. 10 psf = 10 / 144 psi. Your eardrums can rupture at 5 to 10 psi sudden changes, so "a couple psi" is quite a bit.
2007 E90 335xi || Sparkling Graphite || Terra || Burl || 6MT || Premium || Sport || Cold Weather || Sirius || Comfort Access
ED May 2007 Report
My 335xi in the Alps

Last edited by bimmerFUD; 06-16-2007 at 11:32 PM. Reason: added "sudden changes" to be clearer