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Old 05-13-2020, 11:01 PM   #23 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,811

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)
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Originally Posted by freebeard View Post
... My thought drift to the Merkur XR4Ti with it's biplane spoiler.

Just mounted at the top of the hatch and pancaked somewhat....
I love that spoiler. I also suspect that the roof spoiler the OP is describing might not be so much to let air escape as it is for "tuning" the flow in some way. For example, Subaru apparently spent a lot of time and money tuning the position of those silly looking vortex generators you see on the STi from a fee years ago. The goal, I read, was to direct flow to the substantial wing on the rear decklid.
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.

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