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Old 05-17-2020, 03:47 PM   #6 (permalink)
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Originally Posted by California98Civic View Post
Again though, at 18:1 AFR, this chart suggests NOx is lower than at 14.7:1 and so is CO2. Why isn't 18:1 lean burn common place in contemporary cars? Or is it maybe common and not touted like in the old days of the 90s and early 00s?
That graph is assuming you donít have a cat,

Given the circumstances today itís likely because of two things

1. We never did it so itís impossible (hear that a lot)
2. Emissions controls (not represented by the graph) reduce Nox below the graph,

the unfortunate part is because we are laser focused are a single pollution percentage we rather burn more fuel and make more pollution in grams per mile.
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