Quote:
Originally Posted by jamesqf
I don't claim to be an automotive engineer. I just know what happens to the mpg display on a cool day, when the ScanGauge shows IAT around 60 degrees, and I hook up the duct that brings warm air off the cat to the intake. The mpg goes up significantly. If I said I knew for sure how or why this works, I'd be lying. I just know it does work.
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Is this on a gas or diesel engine? Warmer intake air should help out reducing pumping losses on a gasser at part load, but on a diesel w/ no throttle to incur said pumping losses there's no point.