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Old 04-22-2019, 02:07 PM   #2 (permalink)
Master EcoModder
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Join Date: Apr 2012
Location: Evensville, TN
Posts: 643

Deep Blue - '94 GMC Suburban K2500 SLE
90 day: 23.75 mpg (US)

Griffin (T4R) - '99 Toyota 4Runner SR5
90 day: 25.43 mpg (US)
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I have made two conveyor belt air dams (2005 Tacoma, 1994 Suburban) both work well and have stood up over time. I could see conveyor belting being very useful as a belly pan material between the frame and rockers, to allow for some flex.

I personally rather enjoy my air dams, they add a handling bonus that is noticeable. I sized mine at the point of the lowest obstruction under the truck (excluding the rear chunk) so I don't think I have increased my effective area. I have noticed a slight drag reduction at this height. I also drop mine lower near the sides, to act as a sort of tire spat.

My generic comments on belly pans is to not enclose the exhaust or you will create an oven. I also don't know about belting very close to the exhaust.
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