Found this over at Teamswift:
TeamSwift • View topic - Aerodynamic Foundation Vent
Member "vance" got the idea from looking at foundation vents (something I admit I'd never heard of - I've always lived in buildings with basements!).
Here's a manually adjustable foundation vent:
And here are some images of what vance made on his car. Not sure, but you may need to log in to teamswift.net to see the full size attachments he posted:
Quote:
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A friend of mine at a fabrication shop took about 15 minutes to load my template into his CAD program, load it into the computer & cut some scrap aluminum into the vent cover & inner door. He gave me some scraps, which I fabricated the aluminum brackets with. I purchase a 5-foot long choke cable (which was barely long enough) that slides the inner cover open or close
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Brackets installed...
Rear of custom vent showing slider track...
Installed....
He's pretty happy with the results. You can
read his full comments on the mod & its effects and see the bigger pics at teamswift.