Decent thread on EGR affects on gas mileage and knock.
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Originally Posted by 3kvr4
Do you even know what the good side of the EGR system Does? It does not look like it  opcorn  <First one to use this smile!) . I dont think you want to heat up your block anymore and get some knock. And yes i read about it and did some research linebckr  |
I tend to agree more with twospoons posts from the above thread. You can tell me recirculating exhaust back into the intake cuts down on oxygen levels and therefore reduces knock...fine. Besides the fact that if you are knocking at partial throttle and low-load...you have other problems...here are my thoughts:
a) exhaust gas is 1000+ degrees...that's a hell of alot hotter than intake temps.
b) egr = carbon deposits. Carbon deposits = hot spots. hot spots = knock.
The EGR system was added to reduce emissions, not aid gas consumption or reduce knock.
I've researched this alot too. And while EGR deletes will always be debated...just as much as underdrive pulleys, I personally lean towards deleting it.