Quote:
Originally Posted by Daox
Same here. I have a zeitronix wideband zt-2 system on the Matrix and it would take nothing to lean it out and get 40 mpg all day with the wife driving. However, with all I have learned about emissions its really not worth it.
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Thanks!
BTW, in my opinion (haven't done the research to gather the data to back this up) the major contributor to smog (NOx, particulates) is the diesel engine. They have started to clean up in trucks since mid-2004, but think of all of the pre-2004 diesels out there! They were not even required to have a PCV, no TWC (three-way cat), no EGR, just raw particulates, NOx and HC's being thrown out the tailpipe! And usually in huge quantities as they are mostly large engines...
However diesels are getting much better with 2007.5 requirements, and we can look forward to more improvements 2010.
Suffice to say that a modern OBDII gasoline engine is far far cleaner than the worst emissions offenders.