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Thread: A belly pan question
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09-29-2010 #21
The belly pan does not have to be continuous or complete. Although for the best aerodynamic affect it should be as smooth as possible. The goal is to keep the air under the car moving as fast as possible over the underbody.
That said, the exhaust(at least mufflers and cats) don't have to be covered.
Here's what we did for the One Lap Odyssey I built at work(Honda).
Using a single roof/floor manometer reading and assuming the same pressure difference over the main roof area, we measured an improvement of 230lbs(191lbs of lift --> 40lbs of downforce) at 100mph.
FYI the van is 532whp twin turbo 3.5 V6 Honda Odyssey. 6-speed manual. H&R coilovers, Enkei 19x10, 275/35/19's. Turbo system built and tuned by yours truly with Autronic ECU. Built for the '06-'08 One Lap of America.