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Sorry about the confusion, I expected there to be more over lap of the aluminum and lawn edging, I knew the 5'' or so the lawn edging offered wasn't going to be enough so I was shooting for between 7'' and 9''. Once I started mocking it up with the actual parts I realized 9'' of air dam was going to work a lot better than I expected.
And boy does it work.
I ran the air dam hard on a 6 hour drive taking it up to 90mph on several occasions with a strong cross wind. I tried to break it for hours. Got 18mpg and at the speeds I was going I expected a lot less than that.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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