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Old 09-18-2015, 09:49 PM   #31 (permalink)
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I have found 3M tape and painted Aluminum Flashing to be cheap, easy, and nice looking!

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Old 10-07-2015, 01:41 AM   #32 (permalink)
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I thought the Prius turned out pretty well, so far:



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Old 10-07-2015, 09:56 AM   #33 (permalink)
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Quote:
Originally Posted by Hypermiler1995 View Post
Yes!!! But more closed up than that!

What I want this thread to show is easy diy mods that actually look good!
What is really needed here are diffusing cones behind all of those nicely radiused holes. It may be easier to arrange an array of small diffusers and block some off than to build louvers that provide both a variable opening and efficient air flow.

Hmm. This was in reference to the 1st page illustration of perforated sheet metal.

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Old 10-07-2015, 10:06 AM   #34 (permalink)
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Have a look at some 50s custom cars for fender skirt ideas. Most of the eco-mod rear skirts I've seen just try to fill the hole, but it was not designed for that. Re-shape the whole area with a large, flowing shape that covers the whole wheel-arch flare, and probably meets the bumper. On a 4-door, cut off the front and glue it to the door. I've thought of making molds for skirts that would fit many different cars. To do a one-off job, you can save time by making one, and then pulling a single skin of fiberglass off it as a mold. Then, turn the skin inside out, support it well, and add layers.
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Old 10-08-2015, 12:22 PM   #35 (permalink)
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I used coroplast on my Cummins diesel & caravan; small improvement in mpg. I need to find black coroplast for the cummins because it won't stay painted. The front of the van I blocked off the lower grill using heavy black duct tape & trimmed it with curves to look natural. The rear I made a Kammback out of coroplast & covered in duct tape- 4 yrs later still holding up just fine.

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