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Old 07-04-2003, 07:04 PM   #6
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Member#: 11170
Join Date: Oct 2001
Chapter/Region: Tri-State
Location: NYC
02 WRX
15 WRX/05 GTO


Originally posted by legacy777

Just curious, how does EGR valve reduce NOx & detonation. NOx forms in high temps, high MEP, etc. Does reducing the amount of oxygen by inducing already burned gasses reduce the overall combustion temps?
Yes, that's the basic function of EGR. Its primary purpose is to reduce NOx by lowering the temp, and detonation is reduced as a byproduct of those lower temps.
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