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Old 10-06-2011, 12:24 PM   #1 (permalink)
Cyborg ECU
California98Civic's Avatar
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

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
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Question Do engine mods change BSFC mapping?

Given the interest in mods of the engine as well as mods of the nut behind the wheel, I wonder...

Is it possible that I have changed the location of the "sweet spot" island on my car's BSFC map by modifying the engine with a WAI, an ignition timing advance by 2*, and removing PS, AC belts, and most alternator electrical load? The car on balance probably has more hp at the wheels now, no? In theory, should that change my BSFC mapping any? I would think it would. What do you think?

If I have changed the BSFC map then I need to readjust the nut behind the wheel... I should expect peak efficiency at load in different parts of the RPM arc than with the stock engine, no? What am I failing to understand that counts?

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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