Originally Posted by
steveo
there are more egr parameters not defined that might limit you a bit, nobody seems to tune the EGR much. i'll look into it a little for you.
i should tell you that my experimentation certainly showed messing around with the EGR hurt, not helped fuel economy. the stock egr settings already seem to be pretty much maxed out into a state where the EGR doesn't hurt much in the way of performance.
although it seems more of an inert gas would fill in some space and simulate a slightly smaller displacement engine or whatever; i think that's all negated by the fact that cold combustion temperatures and less torque are certainly both enemies of efficiency.
the fact you can jack up timing to make up for the loss a bit doesn't make it an efficiency gain, just helps prevent a major loss.
let me know if you find different, though
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