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Old 03-05-2012, 12:55 PM   #7 (permalink)
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Blackfly - '98 Geo Metro
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Originally Posted by kingsway View Post
But to my great suprise, when I did the cost-down test again, from 50 to 40 mph, instead of slowing in 14 seconds, it took nearly 20 seconds!!! (I repeated the test several times)

Now, it was just a quick and dirty test - with no account of wind (although the air did seem fairly still)
Wow. That seems really encouraging!

If I were you, I would want to do the test under identical conditions (excuse me if my reading of your test is wrong - I got the impression you did your coast downs on different days). I'd want to be sure the effect is from the mod, and not something like a tailwind or the wake from vehicles ahead of you, or ???, etc.

Why? Whenever I do a mod, I always say to myself: "there is a remote possibility this mod could in fact be making things worse." The only way to know for sure is to do the best test possible and be careful I don't accidentally deceive myself into leaving a bad mod on the car!
Honda mods: Ecomodding my $800 Honda Fit 5-speed beater
Mitsu mods: Oops, I did it again! Bought another cheap, 3-cylinder Mirage. Mods in progress...
Ecodriving test: Manual vs. automatic transmission MPG showdown

has launched a forum for the efficient new Mitsubishi Mirage - fuel efficiency info for Geo Metro owners - electric car conversion on a beer budget
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