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How does the EGR affect engine performance/economy? I don't know.
But if it works correctly it reduces NOx, otherwise known as smog, which is a bad thing to pump into the atmosphere for everyone to breathe.
I was born in LA county, California and in the late 70s smog was BAD (add as much emphasis as possible!!!) It resulted in me getting asthma as a baby. Mysteriously, being moved to Arkansas (very little smog due to lack of congestion) has put the asthma down as a footnote of my life, not something i have to deal with. And with cali's strict regulations, smog is nearly nonexistant now.
the design of the EGR is to reduce smog. So if I want to get an extra 1 mpg, i'll lighten up on the throttle or use some better oil but the only thing I'll ever do to an EGR system is repair it back to OEM specs.
Is 1 mpg really more important than taking the chance of poisoning our air with NOx? Wouldn't that be considered selfish if it was?
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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