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Old 08-05-2011, 05:09 PM   #53 (permalink)
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Join Date: Aug 2011
Location: Frozen Wisconsin
Posts: 9

Blue By You - '96 Ford F250 XLT
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Originally Posted by Big Dave View Post
I am on my second iteration of air dam. The first one extended to within 1.5” of grade and got the 27.00 by itself. I also had side skirts where the running boards used to be. They approached 3” of the ground. Air dam & skirts that low dragged the ground a lot. No damage due to the fact they were ripstop conveyor belting but an annoyance all the same. With the air dam that low I probably lost some CdA due to increased frontal area.

Second iteration, I ditched the side skirts (more trouble than they were worth) and raised my air dam up to 6” above grade in front of the wheels and 9” above grade in the center (just covering the steering tie rod). MPG drifted back into the mid 26s. This setup obviously never drags or fouls parking curbs. It passes over most road kill.

Gonna try again, splitting the difference. Probably 3.5” in front of the wheels and 6” in the center.
Any update on the air dam? I'm building one somewhat similar.
'96 F250 XLT, Diesel, auto, 4x4

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