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Posted by: realred914 Nov 17 2010, 10:52 AM

coeff of drag:::: condtion:
.363::: all windows closed, roof on, lights down
.380::: all windows closed roof on, lights up
.381::: all windows open, roof on, lights down
.389::: all windows closed roof off, lights down
.447::: all windows open, roof off, lights down
.464::: all windows open, roof off, lights up


worse case verses best case is a 28% change in drag coeff.

data from Up fixin der Porsche vol V, pg 314

Posted by: Eric_Shea Nov 17 2010, 10:55 AM

What is all windows open, roof on, lights up?

Posted by: Elliot Cannon Nov 17 2010, 10:56 AM

A very significant difference. With my 3.2 liter car, with the windows up and roof on I get 26 MPG. With the rooff off and windows down I get 23 MPG.

Posted by: Tom_T Nov 17 2010, 06:11 PM

Well Eric, it's ...... ummmm ...... not on the list, so you obviously should NOT drive that way!

Thanx for posting these realred!

Posted by: URY914 Nov 17 2010, 07:27 PM

No windshield, no roof, no windows, no headlights, big wing?

Posted by: Eric_Shea Nov 17 2010, 07:34 PM

Probably about the same as this:

Posted by: Sleepin Nov 17 2010, 07:42 PM

I think mine would be better with the front and back doors to my garage open...usually the wind just blows right around the jackstands!