question: I know disabling/removing the EGR vlv on diesel MB's will net the car better MPG and overall performance...will it do the same on a gasser? (m103?) are they any performance/effiency reducing devices that I could disable?

thanks

kris

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EGR on a gasser doesn't have the same effect as it does on a diesel.

In a diesel you have no throttle and run with excess air. The more excess air you have the more power you extract from the fuel. EGR heats the intake charge allowing less of it to fill the cylinder. It also reduces the specific heat ratio of the gasses in the power stroke. This reduces your power some.

In a gas engine your engine is throttled and the power is controlled by how much air fuel mixture is allowed into the cylinder. The exhast gasses from the EGR just act as filler. Without egr your engine pulls more of a vacuum. This vaccum is a double edge sword. A vacuum helps evaporate the fuel droplets into a vapor. A vacuum also makes your engine work harder to suck in a charge. These offsett each other for the most part so adding EGR on a gasser really doesn't hurt you much if any.

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Adding EGR on a gasser always causes a loss of some efficiency and fuel economy sufferes slightly. Sometimes it's noticeable........1.5 mpg or so........sometimes it's not...........less than .5 mpg..........but it's never zero.

EGR valves on gassers won't hurt performance as the recirculation is only done under partial throttle. But fuel efficiency may indeed suffer a small amount.

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The EGR hurts "performance" in the sense that it detracts from throttle feel. It's like losing the power of 1/2 cylinder on a V8. Disconnecting it will give you a "noticeable" feeling of additional performance for about two minutes until you accept that new level as the standard.