I've been thinking about taking the egr off. What are the advantages and disadvantages of removing it? All opinions are welcome.
Is it broken? If not, dont @!#$ with it. I see no reason to remove it unless it is faulty or you are making a modification to the car that requires you to at least relocate it.
advantages: makes it possible to run a quad 4 manifold.
disadvantages: MIL
87 Firebird
All stock...........lol.
disadvantages: more NOx exhaust emmisions, worse cruising gas mileage, and mil
so you get worse gas mileage if you remove it or if you keep it? I always thought it would give better mileage by removing it.
keeping it improves fuel economy
horsepower is the force that determines at what speed you hit the wall, torque is the force that determines how far you take the wall with you after you hit it.
mine has been removed and the code shut off via hp tuners.
car still gets 32 mpg and is modded quite a bit. i say its worthless. ditch the ugly POS asap.
I'm tired of wasting my time... now I'm breakin' free.
(Tom) S/C Fire wrote:disadvantages: more NOx exhaust emmisions, worse cruising gas mileage, and mil
hit the nail on the head!
Stolen from another website:
Quote:
The sole purpose of the EGR system is to reduce the formation of Oxides of Nitrogen (NOx). These are formed when the temperature in the combustion chamber reaches very high levels. To avoid this situation, the EGR system is used to lower combustion chamber temperatures by admitting small amounts of exhaust gas back into the combustion chamber. As you can imagine, exhaust gas does not burn, and does not help the combustion process. If the EGR system would admit exhaust gas into the combustion chamber at idle, it would cause a rough idle, or stalling. As a result, EGR does not allow exhaust gas into the chamber at idle.
During WOT (wide open throttle), the ECM shuts down EGR. Since EGR will play no role whatsoever under WOT, it will not impede the engine's ability to generate horsepower.
I've highlighted the important part for you. If there's nothing wrong with it, and it's not in your way of something... what's the point in wasting time removing it? It does you no harm in leaving it on the car. However... if the EGR system is leaking and you are certain that it is the problem... and it's cheaper somehow for you to get the EGR codes removed than fixing the system, then give 'er!
...j
i removed it mainly because its a big PITA to remove but also because it looks absolutely hideous.
i also live in a state that doesnt require emissions checks so thats another reason.
and last but not least id rather have nothing but the coolest air entering my intake system, not some hot ass exhaust gases. regardless of when the egr is engaged, it still dumps hot air into the system and keeps the intake manifold hotter. granted, my venom transfers heat a lot more than the stock plastic one but thats just one more reason for my doing it. that thing gets super hot even without the damn egr hooked up!
I'm tired of wasting my time... now I'm breakin' free.
remove egr for supercharger... its ugly, pain to work around, not needed, ho manifold
Edited 1 time(s). Last edited Wednesday, April 29, 2009 5:47 PM
8 psi with m62 and IAT under 100
It should be noted in here, amongst all the other true technical posts, that the the fuel & spark are mapped to work with the EGR's dilution. Eliminate it without remapping & you'll be looking at possibly the need for higher octane fuel to inhibit any spark-knock that'll occur. But if you have an HP Tuner, and have eliminated the EGR from the engine's management functions... I'll bet you're also capable of, and have, remapped the curves anyway.
Go beyond the "bolt-on".
Are you really as stupid as you come off as?? If the PCM does not see the EGR open it will still allow the correct amount of fuel for the engine to operate in a safe manner. You do not need to make any changes whatsoever to the program. Funny how my truck went for well over 20K miles with a stuck closed EGR and not once did I see a single failure code for system lean. The PCM will just compensate for the lack of EGR function.
obviosuly I am not an expert on fuel and air. So why would it creat hotter cylinder temps without the egr? Is it becuase there is more oxygen burning? Or is it becuase there is a more complete burning of the fuel?
in conclusion,
take it off if you don't want it. or keep it on if you don't care.
you will need a different intake manifold if you take if off. either a 00-02 mani or a HO or LO mani.
i'm taking mine off for the HO mani if i ever get my header i purchased from ebay 3 months ago. git-r-done!
brodycog wrote:obviosuly I am not an expert on fuel and air. So why would it creat hotter cylinder temps without the egr? Is it becuase there is more oxygen burning? Or is it becuase there is a more complete burning of the fuel?
Exhaust gas is inert and won't burn, so admitting it (via the EGR valve) will dilute the fuel mixture thereby reducing the combustion temperature. A non-diluted mixture that contains a full air/fuel charge will burn hotter.
EGR was a much bigger deal in the early '70's when emission controls were in their infancy. Everything was controlled via vacuum valves and temperature switches. It was actually possible to improve performance on some engines by removing it as compression ratios were also low, detonation wasn't much of an issue, and you could manually deal with ignition timing and other related items.
you dont NEED a 99.5-02 intake manifold to ditch the egr. just the stock plug that goes in the hole or make a block off plate.
I'm tired of wasting my time... now I'm breakin' free.
mitdr774 wrote:Are you really as stupid as you come off as?? If the PCM does not see the EGR open it will still allow the correct amount of fuel for the engine to operate in a safe manner. You do not need to make any changes whatsoever to the program. Funny how my truck went for well over 20K miles with a stuck closed EGR and not once did I see a single failure code for system lean. The PCM will just compensate for the lack of EGR function.
Hey, you're the one with the unrecognizable cartoon figure as your sig...
You tell me!
Go beyond the "bolt-on".
wouldnt hotter cylinder temps make for better fuel atomization? How much does the temp increase from removing it?
I'm removing mine for the weight savings and like Brad said, it's ugly, and in the way. Weight reduction ftw.
I've also got HPT so no issues on the MIL.
Misnblu.com
Newbie member since 1999
Thank you Dave and JBO! 
is there really that much weight saving in removing the EGR?
my fuel economy has kind of gone to @!#$ now anyways since all my driving is always in town now... a tank only lasts me like 300 km.
my AC is gone too, so thats either going to get recharged or pulled out this year... i havent decided which. obviously recharging would be nice and im sure my fiance would appreciate it, but tanking it out is cheaper and removes weight.
anyone know how much weight both the AC and the EGR remove?
1997 Cavalier Z24
Bomz Short Ram Intake
Vibrant Cat-Back
KYB GR2 Struts
Goldline 1.75" Springs
RK Sport Upper Insert
RK Sport Lower Dogbone
Custom Tune by Shane @
innovativetuning@rogers.com
15.647 @ 88.02 MPH
With both removed, you're losing at least 50 pounds from the car or really close to that.
I've never measured the weight of any component I've removed for weight savings but to me, every little bit counts.
An example will be me relocating the battery to the rear of the vehicle and getting the carbon fiber Braille batter which weighs only 11 pounds.
Stock factory battery is close to 35-40 pounds or more.
Little things like this make a world of difference in a n/a car or even one that is boosted.
Misnblu.com
Newbie member since 1999
Thank you Dave and JBO!
Have you heard about the lithium iron-phosphate battery out in the aftermarket for cars now? It's supposed to be the thing to have... Especially if you're running without an alternator in drags, supposedly.
Go beyond the "bolt-on".
blu is right. every little bit helps.
egr alone doesnt weight but pry 5lbs... but add it to everything else you remove and it's a lot.
I'm tired of wasting my time... now I'm breakin' free.
if I remove it I'll just cover the egr hole on the intake. I wouldn't waist my time with the ho intake not for my build.
