I was a little stumped when I saw this thread yesterday morning. All I could think of was a belly pan under the restrictions but felt it may not be enough. I've changed my mind about that based on the Audi claims below.
I'm really impressed with the responses covering the wheels and pans.
https://www.audi-technology-portal.d...tics/underbody
Quote:
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A car produces 40 to 50 percent of its total aerodynamic drag in and around the underbody, the wheels and the wheel arches..........
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There was a thread recently which explored the leading edge of the wheel wells as a drag reduction area. I'm wondering if this project is a candidate in that the modification could be made rather subtle.
What I have in mind would be a flat piece of rubber in an arc shape which closes up the wheel gap and forms a clean release edge for the air. Being black in color it may not be all that noticeable.
To understand the desire for such an apparatus (flare/molding) look at CFD images which include wheel wells.
Maybe there is something in the JC Whitney catalog which can be chopped up?