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Old 05-17-2020, 04:09 PM   #9 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
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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 rmay635703 View Post
... 2. Emissions controls (not represented by the graph) reduce Nox below the graph,

... we rather burn more fuel and make more pollution in grams per mile.
I am aware that the graph assumes no CAT. But if the exhaust in cleaner going in, it'll be cleaner coming out, assuming a properly efficient CAT, right? Am I wrong about that? Cleaner in, means cleaner out?

This all would suggest that modifying a car to run lean at 18:1 is likely cleaner than stock. Hondas like the VX and HX and the Insight all did lean burn from 1992-2006 and they had the best or almost best emissions ratings (LEV, ULEV, and such). Those lean burn systems relied merely on ECU tuning, a wideband O2, and a knock sensor, IIRC. Not a super high bar.

I guess I am surprised because I thought the LB engines had higher NOx, but that is no necessarily true, unless something is still missing from this picture.
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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rmay635703 (05-17-2020)