Quote:
Originally Posted by rmay635703
... 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.
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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.