Quote:
Originally Posted by Shankenstein
Absolutely, it reduces lift! Like a golf ball, therefore woooosh! \s
The dimples will initiate a turbulent boundary layer, which will hug the diffuser further up the rear. The higher it goes, the less wake cross-section. I expect the contribution of the dimples is very low.
The main way the muffler reduces lift isby providing a smooth transition between the pumpkin and the bumper. They could have left it level, but angling it will prevent the flow from getting too caught up in the rear suspension area. I'd hope that the aftermarket exhaust kits maintain that slope, but most welders are more concerned with fitment than aero.
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I completely agree with you on the muffler angle but those dimples are spot welds from the internal baffling.
There was a big to-do about the dimpled vinyl that was being sold for Motorsport use a few years ago so one of the NASCAR teams did some testing. They found the dimpled surface on a golf ball works because it a rotating body and didn't really apply or work the same on a non rotating surface.
When I'm not on my phone ill look for the article and post it up.