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Old 07-27-2010, 12:16 AM   #12 (permalink)
Big Dave
Master EcoModder
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Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,319

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
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I'm planning to use threaded rod struts at first for the steps. That way I can experiment looking for the best angle & spacing. The struts should be out of the high-energy air stream, but once I settle down on a design, I'll use something that looks a bit better.

The big question in my mind is how far back should the first step begin. My problem is I cannot just snug it up on the cab bulkhead and expect to be able to open my tonneau lid. I look for the first step to be 6-8" below the cab top and the second one will split the difference.

I'll probably have to breakover and buy a scan gage even if my engine control tuning makes a hash of readings. Maybe the error will be consistent and I can find a "best" configuration and then test it the old-fashioned way for real performance.
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
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