Quote:
Originally Posted by camshaftgsxr
wow this is as wrong as it gets... ditching the egr will improve gas mileage, but it will also make it non emissions compliant
the egr is an Exhaust Gas Recirculation valve, it pumps exhaust into your engine to keep the airfuel mixture from burning too hot while cruising down the highway, exhaust into an engine hurts the hell out of performance btw...
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Exhaust into the intake tract would hurt performance, yes... but when the EGR is running you're not shooting for performance anyway since you're at idle/cruise!
Removing the EGR won't increase fuel mileage, it will make it worse since more fuel will be used at idle and cruise. The hotter air being introduced needs less fuel to burn at stoich. Less fuel = better mileage. When you push on the go pedal and are trying to squeeze power out of the engine the EGR closes (it's vacuum operated) and you're essentially running a non-EGR system.
The whole EGR system can be a pain in the butt, because they're failure prone... but it's a system that increases mileage (on a properly tuned engine), not decreases it.