Re: Electronic to Mechanical Pump

Posted by jdemarisj on April 04, 2006 at 20:15:31 from (69.67.234.116):

In Reply to: Re: Electronic to Mechanical Pump posted by buickanddeere on April 04, 2006 at 13:40:23:

I've got several with, and several without the EGR valve. On the diesels, it doesn't do very much. On a same year GM, a standard-duty diesel came with one, and a heavy-duty came without it. Often the one without the EGR gets worse mileage - but that's becasue once labeled "heavy duty" GM could turn the fuel up a bit and make some smoke - and get away with it. I've never noticed much difference between them in performance or mileage.
In regard to the extra power and wind-resistance at higher speeds, of course that's true. But in addition, most diesels have a narrow efficiency band, much more narrow than for most gas engines. So, the extra RPMs outside of that efficiency curve help create a large fuel-mileage drop.

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