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California98Civic · 04-02-2018, 11:04 AM

Given that even NOx emissions can be much lower at an AFR 18:1, why don't we see it more often? Or do we? Are OEM cars currently tuned to run lean under light load? 18:1 does not seem very radical. Wasn't lean burn in the Civics 20 or 22 to 1? Would you even need a knock sensor if it were strictly for light load, like freeway cruising? How much hotter would a block get? How much hotter would the CAT get?

Just curious.

04-02-2018, 11:04 AM	#1 (permalink)
California98Civic Cyborg ECU Join Date: Mar 2011 Location: Coastal Southern California Posts: 6,299 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 Thanked 2,174 Times in 1,470 Posts	Run lean for emissions? Given that even NOx emissions can be much lower at an AFR 18:1, why don't we see it more often? Or do we? Are OEM cars currently tuned to run lean under light load? 18:1 does not seem very radical. Wasn't lean burn in the Civics 20 or 22 to 1? Would you even need a knock sensor if it were strictly for light load, like freeway cruising? How much hotter would a block get? How much hotter would the CAT get? Just curious. __________________ 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. Last edited by California98Civic; 04-02-2018 at 12:10 PM.. Reason: Spelling error in title