Quote:
Originally Posted by tony_2018
I just don't know if the high nox will kill the converter, thats my issue. I'm running a lean burn d15b 3 stage and the lean burn is great. I'm wanting to go a chip ecu route so i can get away from this oem ecu. I have the proper ecu for both 5spd and cvt, cvt does not go into lean burn but does activate 2nd stage and 3rd stage vtec.
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Sorry I didn't answer the question the first time. Anyway, no you will not be doing any damage. Actually, running rich damages the cat because you are sending fuel out of the exhaust ports which can then ignite causing increased heat in the exhaust and cat which can burn it up.
When you are in lean burn your exhaust gases are actually cooler, the fuel is more fully burned, and the result is actually cleaner air coming out of the exhaust ports than with regular burn.
The misconception about lean burn and emissions is due to the cat itself. Modern cats are designed to filter regular 14.7:1 mixtures. Basically regular cats are really good at reacting with regular exhaust and create cleaner air. When you run lean burn exhaust through a normal cat, the reactions are not the same because the lean burn air is not as dirty (CO2, NOx levels are different). Since the reactions are not efficient anymore, less filtering is done. What you end up with is really good filtration with normal exhaust, not so good with lean burn
after the cat.
The only reason it really matters for auto makers is federal emissions regulations. To correct this, special cats and emissions systems like EGR are required to meet the regulations. Without the special cats you are just not meeting emissions regulations (while in lean burn).