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Old 07-21-2019, 09:57 PM   #452 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,793

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,160
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spoiler test results

Just got in from testing the spoiler in two configurations at El Mirage. First was just the decklid spoiler and then more of a box cavity type extension of the spoiler down the sides of the body from the trunklid. The spoiler seems to work. Doing coast-down testing the car rolled furthest with the spoiler box cavity, second furthest with the spoiler, and third furthest with the OEM configuration. The box cavity produced a gain of about 7.23% and with just the spoiler I saw a gain of 6.27% rolling distance. A more conservative reading of the results would half those gains. So it seems it could produce between a 1.5% or 3.5% fuel economy increase.

I have pictures and more results... later. It was 110*F on the dry lakebed.


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

Last edited by California98Civic; 07-22-2019 at 01:15 PM..
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