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Discussion Starter #1
hey im taking off all of my emissions stuff and need to know if taking off the egr valve is harmful?

does the egr valve low the exhuast temp enoughto really matter?
would a egt/pyro meter tell me the temp differences?
steven
 

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you will destroy your motor if you do that. dont do it..........
 

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some people will tell you to keep it...some people will tell you get rid of it that it doesnt matter.
All the JDM engines dont have it. We have it for emmisions control.
Now if you have to get smoged or get your car inspected then i suggest you keep it.
I took it off on my old motor it didnt do any harm.
Get block off plates from somewhere (online store) i dont know where.
 

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90T
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Apparently my sarcasm is not coming across.... By the way, you will not blow up your motor with it removed, it will just run pig rich.
 

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my first post wasnt directed to your post :lol: it was for the EGR post. ;)
 

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its purpose is to cool the egt down so you don't produce NOx or whatever it is.

now...it isn't functioning at idle nor does it function at WOT

so if you are building a track day car and weight is an issue remove it..otherwise there is no point in removing it...actually it will do more harm than good.

other words don't remove it unless you have too.
 

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Oldie but a Goodie
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its purpose is to cool the egt down so you don't produce NOx or whatever it is.

now...it isn't functioning at idle nor does it function at WOT

so if you are building a track day car and weight is an issue remove it..otherwise there is no point in removing it...actually it will do more harm than good.

other words don't remove it unless you have too.
He's on the right track.

The only thing he's missing is that he isn't telling you why you'll run pig rich if you remove it. What your EGR (Exhaust Gas Recirculation) does is put exhaust gas back into the flow of air going into the combustion chamber. However, exhaust gas contains no oxygen which means it will not burn. So, when the PCM tells the EGR valve to open, it's effectively reducing the volume of your cylinder by restricting the amount of combustible air/fuel mixture entering the combustion chamber.

Less fuel/air = smaller explosion = lower exhaust temp and lower NOx for emissions. But, the greatest benefit of EGR is actually improved fuel mileage at cruise due to the fact that you're using less fuel to keep the engine running.

So, if anything, by removing the EGR you will run lean under cruising conditions because the PCM will still be trying to trigger your EGR and think that it is running with "X" amount of oxygen entering the the cylinder so it only requires "X" amount of fuel. However, with no EGR you'll really be having "Y" (Y is greater than X) amount of oxygen entering the cylinder and still only that "X" amount of fuel.

Over time, the PCM may correct for the lean condition based O2 readings by changing longterm fuel trims, but this will result in additional fuel being consumed during part throttle and cruising times.



To make a long story short, you're gonna kill your highway mileage and your daily in town mileage will suffer slightly.
 

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well it wouldnt be that much less milage. after i removed mine, i still got 280 miles in town which i dont think is that bad at all for this car.
But when i put the injectors in is when my milage went down hill for some reason.
 

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well it wouldnt be that much less milage. after i removed mine, i still got 280 miles in town which i dont think is that bad at all for this car.
But when i put the injectors in is when my milage went down hill for some reason.
280 in town I'd say is great. Also like I said, in town mileage would only suffer slightly because you're on and off the throttle more. EGR is really only utilized when cruising at a constant throttle position.

Also realize that when I said his highway mileage is gonna suffer, I didn't mean like it was going to drop 10mpg. It'd most likely be a 3-4mpg difference if you did straight highway driving, but that kind of stuff adds up over time.
 

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tire killer
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my car w/o egr made 26mpg on the highway. granted i didnt hit boost once threw the full tank of gas. but i did have an exhaust leak and am running rather rich.

i feel the benifits from the egr dont out way the constant heating of the intake air charge. even on my n/a with intake and exhaust i saw a 2mpg GAIN in mpg on the highway. wich is around 25.5mpg with my dad driving(he drives the car harder than i do).

to each their own but i dont run it.

-shane
 

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Discussion Starter #14
thanks for the ubondence (sp?) of info.

the only reason why im thinking about doing it is because the passed a law taking into affect june that any car 15 yrs and old can get a car show/club plate eliminating emissions on that car and you have to use collector car insurance which is not bad about $300 a year! the only downfall is you can only drive x amount of miles. cough.....just unplug the speedo or roll it back...cough

another thing is im trying to clean up my bay, make it look a little cleaner and such.
so 2-3 miles a gallon isnt really going to kill anything.
 

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Discussion Starter #15
just a thought.
would taking it off also lead to a bit more power due to cooler intake temp and once it learns the new a/f ratio with the added air
 

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just a thought.
would taking it off also lead to a bit more power due to cooler intake temp and once it learns the new a/f ratio with the added air
No, not really since EGR isn't active under WOT. If you're not worried about emissions or gas mileage and want to clean up the bay, go ahead and take it off. You aren't really going to hurt anything in the long run besides Mother Nature.
 

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Discussion Starter #17
No, not really since EGR isn't active under WOT. If you're not worried about emissions or gas mileage and want to clean up the bay, go ahead and take it off. You aren't really going to hurt anything in the long run besides Mother Nature.
oh ya forgot about it not being active at idle or wot
 

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280 in town I'd say is great. Also like I said, in town mileage would only suffer slightly because you're on and off the throttle more. EGR is really only utilized when cruising at a constant throttle position.

Also realize that when I said his highway mileage is gonna suffer, I didn't mean like it was going to drop 10mpg. It'd most likely be a 3-4mpg difference if you did straight highway driving, but that kind of stuff adds up over time.
You've got to be kidding... It's only routed to one cylinder - 6 and fed by a tiny little 1/2" hole... EGR is a federal band-aid requirement. It's just an attempt to reburn some of the spent exahust. There's no real benifit to EGR will not effect mileage. If it did help the MPG there'd be EGRs for every cylinder...
 
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