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Old 03-11-2018, 07:47 PM   #6 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 5,219

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.37 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Originally Posted by Old Tele man View Post

Consuming 'half' again more power is going the wrong direction when chasing fuel economy.
Well, no if it allows you to downsize an engine. That's the premise of the ecoboost 1.0L turbo in the Fiestas. The thing about those Fiestas is they saved exhaust power with the turbo and did not save any breaking power. If the turbo got smaller, and an electric grid/regen powered supercharger took up some of the slack... Or/and a motor/generator of the GM eAssist type... Pretty complex at this point but just for discussion... "General efficiency discussion" as the subforum is titled, what is the liklihood of an overall fuel economy benefit?

Take your 15 hp at highway speed number and your 8hp figure for the assist. That's like 6kw out of the electric supercharger and/or eAssist motor. Yet, the eAssist's last generation was something like 15 or 20 hp output.

An eAssist usoing the serpentine belt to turn the crank would be fighting pumping losses, exactly what a modest electric supercharger would reduce, no?


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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