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Old 05-13-2008, 11:18 PM   #1
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mud flaps

Anyone have any evidence of mud flap removal effecting drag? I know people put on reverse mud flaps and are getting good results.

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Old 05-14-2008, 02:51 AM   #2
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I figure they're sometimes helpful, sometimes not. It's a case by case thing. IF they're much wider than the tires, then they're probably bad, if they're too far back from the wheel, probably bad, hanging in the way of an aero shaped back bumper, probably bad.

I'd also figure that trimming them might be an option rather than removal, if they're fitted close to the wheel, and aren't disturbing any factory aero, then I'd trim them to about a quarter inch under tire width, and round the corners.

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Old 05-27-2008, 12:24 PM   #3
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Some Saabs used a mudflap in front of their rear wheels. (Some older 900s I've seen.) And my old 9000 Aero has contoured deflectors right in front of the rear wheels (and a very odd little mud flap in behind the wheels.) If you see one take a look at them - Saabs 9000, 9-5s anyway, have a fairly low CD ratings I believe.
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Old 05-27-2008, 01:20 PM   #4
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the 2008 9-5 has cd of .29 and .31. that is good.
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