Quote:
Originally Posted by Daox
As more EGR is added you can also optimize ignition timing which will increase efficiency.
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Thank you all for thinking about this as well.
But since I am NOT
adding more EGR, just
cooling it, and
not adjusting ECM programming / timing, it may be a "can't hurt, not sure if it will help" scenario?
Since the ONLY thing in my case would be the adding of a cooler to an already functioning, GASOLINE egr system, then the inert charge taking up space in the cylinder will be denser as compared to a non cooled EGR.
So perhaps some even less sensitivity to knock? Even less chance of NOx?
If O2 sees sees a bit less NOx, due to results of a cooler & denser EGR inert volume, then (perhaps) it knows it can advance timing more (more MPG)?
But, if there is no ECM software logic designed to lean it out and / or advance timing more to increase efficiency, while still keeping NOx low, then there may not be any MPG advantage?
I suppose that is where Mazda and Ford are taking advantage of cooled EGR with SkyActiv and EcoBoost. Their computer actually will know it is cooled, and take full advantage of it to increase MPG.
So many variables, so few sensors, so little control over our ECMs...