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wow, it suprises me this discussion is still alive.
EGR is for reducing the combustion temperature (less O2=less NoX produced) and it has the side advantage of reducing power losses from the engine having to work to make a vacuum in the intake. All of this has been trumped by variable valve timing, which adjusts the effective compression ratio per the currents needs of the engine by adjusting the timing and duration of the valves opening and closing. This technology allows a vehicle such as a late model Corvette get over 30 mpg at cruise while still being able to smoke the tires when asked to. It also mean cars with VVT don't need EGR.
I've been trying to figure out if I could have a reverse throttle on a modern engine and it work. If you have a throttle that is wide open to EGR gases at throttle, with a second opening to atmosphere, by modulating the amount of EGR gasses instead of the atmosphere you could theoretically get a gas engine without pumping losses due to intake constriction.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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