[mwebb]

you recite EGR theory but have no understanding of how it works
for real

so
in a nutshell
EGR flow reduces combustion pressure and by so doing reduces combustion temperature , thereby reducing NOX formation , which is it's primary function

and
EGR gases are INERT and their presence in the combustion chamber DOES EFFECTIVELY REDUCE COMBUSTION CHAMBER VOLUME
therEby REDUCING ENGINE DISPLACEMENT

which results in the need for more throttle for the same amount of GO
which also REDUCES SUCTION THROTTLING LOSS

which adds up to IMPROVE FE while EGR is functional
these are the FACTS

IF you defeat your EGR your FE will suffer and your system WILL PRODUCE MORE NOX than it would if the EGR was functional

there is nothing to be gained and much to be lost by defeating the EGR
you do not have to believe this or understand it for it to be true.

and it is a violation of Federal law



i dont even believe there is ANY pumping losses with egr disabled and removed. yes it is true that egr increases the throttle opening. but did you stop to think why it does that? it's because the egr dilutes the incoming air with inert used up air that has no combustive value. the egr air simply takes up space in the intake manifold and combustion chamber that would normally have been filled with fresh clean air. in other words, you need X amount of air and X amount of fuel to maintain X amount of speed. with egr on or off you are still using the same amount of air and fuel to go the same speed. the only difference is that some of the air is diluted and the throttle is held open a bit more resulting in less timing. this doesnt magically reduce the combustion chamber volume. it simply renders some of the air that is mixed in, un combustable. and as such it lowers combustion chamber temps. lower cc temps? that doesn't sound good for FE to me. and it isnt. so yes with egr working the throttle is held open more, but you are getting less clean air. the 2 cancel each other out. in the end the same amount of clean air enters the engine, with egr on or off, it doesnt matter. only difference is, ignition timing is being retarded a bit with egr on from the throttle being held open.

i get better mileage with the egr removed and my resistor in place, then with the egr properly functioning. and i havent had a check engine light in a few thousand miles that was egr related. and my scan gauge does show increased ign timing during the same drive with i have egr disabled. and my mpg display shows increased mpg's.
i would hazard a guess that egr is nothing more then an emissions control device. it actually increases fuel consumption on my engine. not a good thing for an ecomodder.


keep in mind also that i don't have a little metro engine. maybe things work differently on small vs larger engines.

V6 chrysler feeds EGR into a central location in the intake
or
has EGR passages to each cylinder ?
because the only possible way EGR could reduce FE in your engine is if your engine
was Feeding EGR gases in un equal amounts to various cylinders
as the -
early 4 cylinder honda accord did when passages to 3 and 4 clogged...
and the 3.8 windstar has the same condition ...
but
chyrsler ? i do not think so .
i will have that answer on Monday -