ThoRx7

Is it true that EGR could reduce HP, thats if its not working properly or you dont have it plugged because in my auto class he states that. It reduces NOx emissions byy diluting the intake mixture with already burnt exhaust. This lowers the combustion temperature and reduces NOx emissions and is the only pollution control device that reduces HP. Thanks

Keng

tt7hvn

iTrader: (5)

even if it remotely reduced HP, it would be such an insignificant amount that you'd never know

at least he got how it works right but honestly; it's just an emissions control device required by the EPA to get vehicles up to their standard.

think about it though: the rotary is an incredible ineffecient fuel hog already, removing the EGR isn't going to hurt anything.

hell, we have an "air pump" on our cars just so they can pass emissions

ThoRx7

Then is it possible for us to pass emission w/o the EGR?

tt7hvn

iTrader: (5)

i doubt it.....but it might be possible

search here on the forums b/c there are a lot of secrets as to how to pass emissions with the 7

MrNizzles

iTrader: (5)

I have an egr in mine, but it throws an ecu code every day. cel always comes on, fortunately, it never did when I went to get smog check. cel coming on during smog check = instant fail. I also have stock main cat and a working air pump with stock ecu. I think that's the basic setup to pass smog in CA anyway. Think I have a pcv as well, but not sure. I stayed as close to stock as possible... cept for my BNR's

CarbonFD3Assault

I live in Canada, where there are no emissions standards.
I plan on removing mine, simply because I can, so I will. . .

and, no,.. my RX-7 will NEVER see duct tape, I promise.

smog-guy707

iTrader: (11)

no you will not notice a gain in hp if you remove EGR. the egr system works under vacuum, which you have none of under pressure...right?

as for the egr throwing codes, it only means there is either not enough flow or no flow at all, it doesnt hurt anything, however... i dont think any of us need higher combustion chamber temp.

ThoRx7

i think u read to quick. i said that you'll notice a lost in hp, not gain.

Tom93R1

iTrader: (2)

The EGR is mostly there for decoration on an FD. Any performance differences between the EGR working, not working, removed, etc will be negligible. Same goes for emissions changes. In CA you will probably fail emissions without it though, only because its part of the visual inspection.

Zhé

iTrader: (2)

he meant the part of canada which he lives in does not have emission standards.
too bad in ontario, our emission standards are pretty close to the california standards from what i heard.
and i think EGR is one of the most important things to passin emissions
you will be runnin more rich without it, and oh from what car mechanics tell me, cars have trouble passin without the EGR, but maybe thats just toronto

Tom93R1

iTrader: (2)

Japan spec FD's don't even have a place for EGR, it can't be that useful of an emissions device on these cars.

jeff p

just leave it on for decoration and the smog man. if its not working right its not going to make a difference. make sure the cat and the air pump is working and you will be OK. I think the 94 FD's didn't have an egr valve . it was removed by the factory.

Jeff

wstrohm

Our 1994 (California) FD bought new had many problems with rough running, traceable to the EGR valve. Eventually Mazda updated the EGR gasket to one with a VERY small hole on the exhaust side of the valve. That ended all our EGR system problems. I've attached a picture of the later gasket, Mazda part number N3A1-20-305A. The tiny hole in the gasket is all that lets exhaust gas into and through the valve. The previous part had a hole about the size of the gasket hole on the intake side. This type was installed by a Mazda dealer in CA while the car was still under warranty.

Bottom line is that EGR (at least on our '94) is a joke. Removing the valve and blocking the ports would not hurt emissions testing in the least. The only problem would be the missing EGR function sensor, which would trip CEL code #16. I designed a circuit that avoids that problem: see the second picture. I have built and tested it on our car, and it works. At the moment, our EGR valve is physically on the engine, but the vacuum control line from the EGR solenoid is removed, and the hose to the UIM is capped. (Someday I will finish the job by removing the EGR valve itself, but that's for another time.)

smog-guy707

iTrader: (11)

^nice...

GARCO MOTORWORKS

The hole in the manifold runner in is very small and yes you can pass with out it . If they look for it just put a blocking plate under it .If the unit has a switch in it ,California model and you are getting codes you can remove the unit ,add a relay and resisstor and solve that problem .