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08-25-2009, 03:56 PM | #2 |
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I would say that there are those which have been developed using real R&D efforts and actually provide some type of aerodynamic advantage. However, I suspect that many are just for looks and provide little to know advantages; I would say that some may even decrease performance.
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08-25-2009, 05:02 PM | #3 |
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Air that passes underneath the car is turbulent and creates a low pressure vacuum underneath the rear end. A diffuser smooths the air flow from the rear of the car which helps maintain downforce at speed. Also by decreasing turbulent air flow, it reduces drag and provides stability.
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08-25-2009, 05:33 PM | #4 | |
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Drives: Vorsteiner E60 M5
Join Date: Mar 2006
Location: 1460 White Oaks Rd. Suite F. Campbell, CA 95008
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08-25-2009, 06:55 PM | #5 |
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There's one diffuser around the boards here that looks pretty damn functional. I think it's VML? It looks like it's about 4 or 5 pieces, covers the whole bottom of the rear bumper and is mucho $$$.
Most of the 'diffusers' on M3post are glorified bumper lips. I think most people get them to help hide the view of the exhaust. |
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08-25-2009, 06:56 PM | #6 | |
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08-25-2009, 07:07 PM | #7 |
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yes there is benefit if using a wind tunnel , and testing
say the quality your looking for is in the range of gemballa ( they have there own wind tunnel and testing equipment ) but yeah, I'm sure most are not tested and will only do harm then benefit |
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