Quote:
How EGR systems work The EGR valve recirculates exhaust into the intake stream.
Exhaust gases have already combusted, so they do not burn again when they are recirculated.
These gases displace some of the normal intake charge. This chemically slows and cools
the combustion process by several hundred degrees, thus reducing NOx formation.
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Found them on wikipedia proving my point that it lowers combustion tempetures. Once i find my advance systems book i can prove more with theory. Sounds like it makes no sense but its proven. Its a chemical reaction that occurs. Basicly thats Fast92RS put. Its hard to explain the science behind it.