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Originally Posted by AdamAshmore
However it isn't unproven, EGR and AdBlue solutions achieve a proven measureable reduction in NOx emissions. Albeit we are prinicipally considering diesel engines here.
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JohnD referred to cooling the EGR gasses with fuel that was about to be injected - that was the unproven part I was referring to. Any heat lost from the gas would be taken up by the fuel, so there would be no net drop in inlet charge temperature, therefore no power advantage.
In petrol engines, NOx emmissions are very low at air/flow ratios commonly used for maximum power, and EGR systems are bypassed at full throttle and load - so is EGR relevent to (petrol powered) motorsport? IMHO - no.