EGR delete?
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
EGR delete?
hey guys my friend that works on my car with me is a pretty good mechanic and has a 300ZX that he knows a lot about and takes really good care of(really fast too!) anyway we were working on my car one day and he said i should get rid of all the EGR stuff. that its just for emmisions and causes deposits and that all the 300ZX guys do it and it actually frees up a tiny bit of horsepower. Have any of you guys ever done this? i dont hear it talked about a whole lot. i just wanted your opinion on what it would do to an LT4 before i did it on my car.
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Re: EGR delete? (1996man)
Yes it is done a lot. I wouldn't worry about it until you start thinking of Bigger mods...IE Headers.
It wont make any more HP and you will have a tough time passing emissions if you have stuff like that. Also you will have to get custom programming to get rid of this.
I wouldn't mess with it on if you dont have to. Even though all my emissions stuff is in a cardboard box not on the car. :lol:
[Modified by VictorRussell'92, 9:40 AM 2/20/2004]
It wont make any more HP and you will have a tough time passing emissions if you have stuff like that. Also you will have to get custom programming to get rid of this.
I wouldn't mess with it on if you dont have to. Even though all my emissions stuff is in a cardboard box not on the car. :lol:
[Modified by VictorRussell'92, 9:40 AM 2/20/2004]
Race Director
Joined: Nov 2000
Posts: 17,103
Likes: 39
From: stop the fun suckers
Re: EGR delete? (VictorRussell'92)
I turned mine off in my ECM programming so it would stay closed all the time.. I noticed a slight decrease in my gas milage.. (milage was at 14.8 stop and go traffic/commuting w/o EGR) I turned it back on and now my MPG is around 15.1 mpg in the same driving conditions. In the programming I can see the EGR only comes on at a very low power demand window.. the rpm's are below 2000 and the tps is around 1%-2% which is nothing.. when you punch it the EGR turns off.. I don't see anything but benifit from the EGR
my $.02 - see sig for mods
my $.02 - see sig for mods
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
Re: EGR delete? (BluByU)
I turned mine off in my ECM programming so it would stay closed all the time.. I noticed a slight decrease in my gas milage.. (milage was at 14.8 stop and go traffic/commuting w/o EGR) I turned it back on and now my MPG is around 15.1 mpg in the same driving conditions. In the programming I can see the EGR only comes on at a very low power demand window.. the rpm's are below 2000 and the tps is around 1%-2% which is nothing.. when you punch it the EGR turns off.. I don't see anything but benifit from the EGR
my $.02 - see sig for mods
my $.02 - see sig for mods
1. More room in engine compartment. Easier to change spark plugs, manifold gaskets, etc.
2. Headers without emission ports IE Hooker 2151's. (get Exotic Muscle if you have the money they have AIR ports and are nicer)
3. One less thing to worry about throwing codes and screwing up on a car with a S*itload of miles.
I would beleave you that milage is crappier tho.
[Modified by VictorRussell'92, 9:59 AM 2/20/2004]
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Re: EGR delete? (1996man)
EGR cools combustion temps staving off detonation. If it pings, the ECM removes timing, reducing mileage and has the potential to decrease the useful life of the engine, particulary if it all ready has some mileage on it. It doesn't do anything for WOT, so taking it out of the equation and doing nothing else is of little benefit.
Racer
Joined: Oct 2000
Posts: 476
Likes: 0
From: Socorro New Mexico
Re: EGR delete? (1996man)
It is automatically shut off at WOT and is only active during cruise and light throttle conditions. Not worth the effort to defeat it IMHO, what with all the retuning that would be required.
Race Director
Joined: Mar 1999
Posts: 16,950
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From: Stafford, Virginia Kittah, Kittah, Kittah...
Re: EGR delete? (1996man)
i just wanted your opinion on what it would do to an LT4 before i did it on my car.
I tried the EGR delete on my previous Vette which was a 96 LT1 and the car ran better IMO, the throttle response was smoother for normal driving, and I was very happy with the results....
About 3 days later I tripped the SES light... On 96+ cars you have second generation diagnostics (ODBII) so removing the EGR will eventually cause you problems... The ECM uses the MAP sensor to check proper operation of the EGR, when it didn't see MAP changes during the EGR cycles it set the SES light off... I reset the light but it still came back every or every other day so I pulled the EGR block off plate that I made...
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Drifting
Joined: Nov 2002
Posts: 1,365
Likes: 3
From: Huntsville AL
Re: EGR delete? (1996man)
It won't run better if you start getting detonation.
In my opinion, it's kind of a "Try it, if it works great, if it doesn't, put it back on."
You can eliminate the need for EGR by putting in cam with more overlap, such as the Hotcam.
In my opinion, it's kind of a "Try it, if it works great, if it doesn't, put it back on."
You can eliminate the need for EGR by putting in cam with more overlap, such as the Hotcam.
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
Re: EGR delete? (HammerDown)
i am planning on doing the hotcam anyway here in a couple months
i can remove the EGR when i do that? will i still have to program the EGR outin the computer if i have the hotcam?
i can remove the EGR when i do that? will i still have to program the EGR outin the computer if i have the hotcam?
Pro
Joined: Jan 2004
Posts: 626
Likes: 2
From: Nashville
Re: EGR delete? (1996man)
I went to the dealer and ordered the LT4 block off plate about $15 and gasket. I haven't set a code yet (not an EGR code). I read about the removal off the internet from some of the camero fourms. I also disabled the AIR system which a lot of the LT1 Impalas had done by GM. I didn't want all the carbon built up in the intake and heads. It does lower the temp of the combustion chamber but it does this by putting already burnt gases back into the chamber which means less air smaller explosion and there you have it. I run 93 octane with a booster so detanation should be ok.
Le Mans Master
Joined: Aug 1999
Posts: 7,339
Likes: 137
From: WilkesBarre PA
Re: EGR delete? (1996man)
but if i get OBDII editing software i can make it ignore the EGR correct? seems to me it would be worth it if you said it ran a lot better.
Safety Car
Joined: Dec 2002
Posts: 3,655
Likes: 24
From: Charleston SC
Re: EGR delete? (1996man)
I removed mine on the LT1 I installed in my 84 because I had no easy way to conect it to the exhaust but if I could have I would have left it. I had my ECM programed for emmisions delete (No EGR, Air pump, cats ect...) The only reason I left off the air pump and EGR was due to how hard it would have been to fab the pluming to make them work. There is no performance gain with removing the EGR or the air pump so why do it? The cat on the other hand was a definate improvment, the 84 was a single cat and I wen't with true duels. My 94 still has all the emmisions and I plan on leaving it ( I will be installing high flow cats with the headers). I look at it this way if i gain no power why not have cleaner air.
Pro
Joined: Jan 2004
Posts: 626
Likes: 2
From: Nashville
Re: EGR delete? (1996man)
Those are for the air pump. And the resaon I delted the air pump was because it plumps fresh air into the exhaust which can make the O2 sensors think your lean and run richer. I know it is only supposed to run during warm-up but mine seem to run all the time. The other reason for the ERG removal was for a cleaner engine. I don't want carbon build up from it plus cleans up the back of the intake. Just my $.02. :cheers:
Thread Starter
Melting Slicks
Joined: Dec 2001
Posts: 2,437
Likes: 1
From: Gainesville Fl
Re: EGR delete? (96BLKTN)
all these ppl say it doesnt help performance but i would think that after a while all that carbon buildup the EGR causes would start to hurt flow and thus hurt performance?
Le Mans Master
Joined: Dec 2000
Posts: 7,839
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From: San Diego, Ca
Re: EGR delete? (1996man)
So the dealers and shops are just teeming with cars that are having their manifolds removed and the EGR passages reamed out? Can't say I've heard of a recall; tech bulletin or what have you issued by any of the OEMS for this specific problem. Granted, the EPA doesn't give a rat's behind if your engine blows up, but they would get it up if cars start emitting high levels of NOX, which is what they are going to do if the EGR is ineffective; ie, the metered exhaust can't get through the manifold because it's plugged up. They are also going to get p.o'd if the engine gets so carboned up that the CAT can't reduce HC levels to mandated levels and the OEMS wouldn't be too happy if they were replacing millions of CATS within the 8 yr warranty. Don't think any of that is happenin'. If you really believe that the OEMS haven't designed the powertrain system to compliment mandated emission controls while providing decent mileage and great performance along with longevity, then hell, rip out the PCM, the injectors, and slap a carb on it. Otherwise, at least provide some data showing that there's a problem with it.
