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Old 06-25-2015, 10:34 AM   #105 (permalink)
EcoModding Apprentice
Join Date: Nov 2009
Location: Austin tx
Posts: 115

vandle - '93 Ford E-350 Xlt
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Originally Posted by diesel_john View Post
I got this brillant idea a couple years back that my windshield was too steep and needed to be tilted back, so, I cut a couple inches of an old set of rear springs and put them in. (under body stock)

Well it just killed my top end and mileage, so I put the stock springs back in.
Mileage and top end back to normal.

So I wonder if I raise the rear an inch what will it do?
My shade tree engineer guess as to why this happened was that you created a wedge under your car, where the air was compressed going from the front to the back creating a bunch of drag.
2007 Silverado 3500 classic duramax diesel, Allison 6 speed auto, extracab long bed. Doing head gaskets, will probably do econo tune and aero mods next.

Mad max would have driven a metro
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