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Originally Posted by oldtamiyaphile
Air cooled VW's and RR cars in general, already have a near perfectly smooth underside.
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If only that were true. Here's a bus example. Suprisingly, only the area between the wheelwells is flat. The bellypan panels were optioned for vehicles with the sunroof, otherwise it's an open ladder frame. The front gets an access panel that isn't particularly smooth.
From the rear torsion bar housing back, the Beetle is the same. Even my Superbeetle has a crossmember about an inch deep that runs laterally at the front of the pan. That will trip the air into turbulence all across the 'smooth' part.
2007 ion2 -- I'd put spoilers at the back and splitter/diverter at the front. Those 'spoilers' from the 70s-80s were basically an air dam with the part in front of the front tires missing.
And I think the purpose of the splitter/diverter is to lower the stagnation point.