Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Black & Green modding thread (1998 Civic DX Coupe base)

California98Civic · 07-21-2019, 10:57 PM

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.

EDIT: POSTED RESULTS: https://ecomodder.com/forum/showthre...tml#post602571

07-21-2019, 10:57 PM	#452 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 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: 2,373 Thanked 2,172 Times in 1,469 Posts	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 110F on the dry lakebed. EDIT: POSTED RESULTS:* https://ecomodder.com/forum/showthre...tml#post602571 __________________ 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 02:15 PM..