Good luck. Emissions change very rapidly as you change AFR. NOx levels go very high at lean ratios - so much so that the catalysts can't keep up. And if you think emissions levels will go anywhere but down....
Ryan
Good luck. Emissions change very rapidly as you change AFR. NOx levels go very high at lean ratios - so much so that the catalysts can't keep up. And if you think emissions levels will go anywhere but down....
Ryan
1970 El Camino *Stolen*
2004 GTO M6
I agree... even running slightly lean will increase NOx levels a great deal...
Your fuel economy will improve by upto 5+ MPG, but your NOx levels will go 2x or 3x the allowed limit... if you're getting this smogged, it will be the failing item (HC and CO will be ridiculously low, almost zero, the smog technician will say "that's weird")).
My understanding is that it's the NOx which causes the dirty brown inversion layer smog thingy you see in the Los Angeles basin on a hot day... altho you don't really see it anymore.
If you're pulling a square (air resistant) load, the engine will be under load even at cruise, and running lean may not be good for the combustion chambers (even if there's no ping, combustion chamber temperatures will go very high).
Last edited by joecar; February 6th, 2008 at 05:39 AM.
But don't CO and HC levels drop in the 15-15.3 despite NOx climbing?
Yes, HC and CO levels drop as NOx levels climb.
Seems we need a cat converter that works leaner than what we have.... Promote higher compression, leaner mixtures, better mpg, and let the cat scrub the exhaust for NOx....
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