Quote:
Originally Posted by rcbildr
If I understand what I read correctly it helps reduce emissions. By recirculating the exhaust gases it lowers combustion temperatures which reduces the production of NOx.
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That's what it does. With modern computerized EGR and spark control it can be used to control detonation with higher compression ratios while running lower octane fuel.
Quote:
Originally Posted by rcbildr
Some people have claimed their gas mileage improved by 1-2 mpg. I removed mine because I'm not sure it is actually working properly and almost all of the emission equipment on my camaro has already been removed. Fortunately, I don't have to worry about testing or inspections out where I live.
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1-2mpg is a large gain...
I'm skeptical on making big gains like that by removing a properly working EGR. It's doubtful you would notice a mileage difference.
Broken EGR will screw up performance and cut into the fuel mileage big time so maybe they were blocking off a broken EGR system.