should i take off my egr valve? pros and cons?
09-01-2003, 02:20 PM
#21
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Re: should i take off my egr valve? pros and cons? The only reason I took mine off was because I swapped an LS6 intake w/o provisions. With the stock intake, I would just cut the tube to help out with the airflow into the intake.
09-02-2003, 04:55 AM
#22
Re: should i take off my egr valve? pros and cons?
No the cams are diff.
A larger cam (change in '01)with more overlap negated the need for an EGR valve.
A larger cam (change in '01)with more overlap negated the need for an EGR valve.
if your put the "older" 97-00 cam in an 01+ car, it would make more hp than the 01+ cam.....
The egr does not effect performance.
I would love for someone to try and show me how filling the cylinders with an unburnable exhaust gas (instead of fresh air/fuel mixture) will not hurt performance.....oh...wait.....nobody would be that stupid...
(j/k)
It is designed to lower combustion temps by inducing inert gas (exhaust) into the chamber.
) so it actually heats up the intake manifold and sends a hotter air charge into the system which can increase chance of knock.....once again....it does however replace burnable fuel/air mixture with unburnable exhaust gas.....
Engine's do tend to ping at a steady low speed high load cruise, the egr operating range.
It is the added insurance against this.
It is the added insurance against this.
...how can adding hot exhaust gas to your intake charge HELP PREVENT pinging..... the reason cars with the egr removed ping is because the increased air flow causes a lean condition.....
If you have emissions to deal with leave it alone spend your time tweekin' the car elsewhere. 
if you can get through emissions without it on (delete the codes and make it look like the EGR was never there) then go for it.....its free hp...
Sorry if I came across harsh but I get really sick of hearing people run the GM/EPA bullshit...
"YES!!! EMISSIONS CONTROLS HURT PERFORMANCE!!! THATS WHY MY CATS ARE IN THE LANDFILL INSTEAD OF ON MY CAR!!!"
once again...sorry about that.....nothing personal...
09-02-2003, 07:17 AM
#23
Re: should i take off my egr valve? pros and cons? thanks for the honesty, i love it. haha so its possible to have it run leaner if i take it out, but for that i just need to keep an eye on fuel trims, becasue it will only effect part throttle right?
09-02-2003, 12:03 PM
#24
Re: should i take off my egr valve? pros and cons? i think im gonna go ahead and just take that joker out, all of you made some really good points but 2001camaroguy's explanation made the most sense if you ask me. thats what i was thinking but some others made it seem like i was thinking wrong. how could hot exhaust gases possibly make combustion temps cooler? my intake air temp is only 5 deg more than the ambient outside temp and those exhaust gases are a lot hotter than that.
09-02-2003, 12:10 PM
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Re: should i take off my egr valve? pros and cons? Lets seeee..... 
Do the Vettes have EGR? NO!
Have Vettes ever had it on the LS1? NO!
Do they have great perfrmance and gas mileage anyway? YES!
Do you need the EGR? NO!
Does it look cleaner, and make it easier to work on with the EGR? YES!
Ditch it! I want to do mine, but will wait until I get !EGR headers for it too.
Do the Vettes have EGR? NO!
Have Vettes ever had it on the LS1? NO!
Do they have great perfrmance and gas mileage anyway? YES!
Do you need the EGR? NO!
Does it look cleaner, and make it easier to work on with the EGR? YES!
Ditch it! I want to do mine, but will wait until I get !EGR headers for it too.
09-02-2003, 12:30 PM
#26
Re: should i take off my egr valve? pros and cons?
thanks for the honesty, i love it. haha so its possible to have it run leaner if i take it out, but for that i just need to keep an eye on fuel trims, becasue it will only effect part throttle right?
09-02-2003, 12:38 PM
#27
Re: should i take off my egr valve? pros and cons?
how could hot exhaust gases possibly make combustion temps cooler?
think of it as the opposite of spraying nitrous:
- on the spray you have A LOT more oxygen and fuel so the temps go WAY up (why pistons melt on the spray if lean)
- so if you now keep that in mind, removing oxygen and fuel (replace it with unburnable exhaust) will mean less heat (but also loose volumetric efficiency and volumetric efficiency = hp)...
my intake air temp is only 5 deg more than the ambient outside temp and those exhaust gases are a lot hotter than that.
....it lowers your VE which means you give up hp and if you think about it even HURTS fuel economy... 
06-14-2007, 10:23 AM
#34
I'd just like to add that in a combustion process, the EGR does have a benefit of lowering combustion chamber temperatures.
By cycling back exhaust into the combustion process, an inert gas has been reintroduced. We all agree that some of the volume of oxygen and fuel is replaced by this inert gas.
What you need to realize is that this gas also has the ability to "absorb" more of the heat energy of combustion as well. This is because the exhaust gases increase the specific heat capacity of the mixture. To put this in perspective, NOx will form around 1500F. A properly functioning EGR is able to reduce those temps significantly. This allows the PCM to lean out the fuel further (since detonation is less likely under lower combustion chamber temps) and increase gas mileage. We're talking only part throttle benefits where MOST of our cars will spend it's life hanging around.
Here's what I think. If you cam it, get rid of the EGR, only the stock 98-00 cams were used with EGR in mind. If you have 01-02, then your cam IS doing it's own self EGR, don't kid yourself that the "concept" was removed. Just reengineered.
A benefit of getting rid of it is that since the EGR is in the intake stream, it's one less contaminant for your intake to deal with.
If emissions are going to be a problem (this is different for every state/country) then keep it.
Where I live, visually inspected for existence, so I have no choice but to play by the rules.
By cycling back exhaust into the combustion process, an inert gas has been reintroduced. We all agree that some of the volume of oxygen and fuel is replaced by this inert gas.
What you need to realize is that this gas also has the ability to "absorb" more of the heat energy of combustion as well. This is because the exhaust gases increase the specific heat capacity of the mixture. To put this in perspective, NOx will form around 1500F. A properly functioning EGR is able to reduce those temps significantly. This allows the PCM to lean out the fuel further (since detonation is less likely under lower combustion chamber temps) and increase gas mileage. We're talking only part throttle benefits where MOST of our cars will spend it's life hanging around.
Here's what I think. If you cam it, get rid of the EGR, only the stock 98-00 cams were used with EGR in mind. If you have 01-02, then your cam IS doing it's own self EGR, don't kid yourself that the "concept" was removed. Just reengineered.
A benefit of getting rid of it is that since the EGR is in the intake stream, it's one less contaminant for your intake to deal with.
If emissions are going to be a problem (this is different for every state/country) then keep it.
Where I live, visually inspected for existence, so I have no choice but to play by the rules.
12-20-2010, 04:04 PM
#37
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12-20-2010, 06:04 PM
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Speedinc has them too. I got mine from there...
I never had a problem after I pulled my AGR off. Just a check light and I had the system tuned out when I did my heads and cam.
The EGR just adds an inert gas (Exhaust) to the combustion mixture to bring down the temperature of the burn to reduct NOX emissions (nitrates of oxygen IIRC.)
-=edit=-
Damn necroposting fkers again!
The EGR just adds an inert gas (Exhaust) to the combustion mixture to bring down the temperature of the burn to reduct NOX emissions (nitrates of oxygen IIRC.)
-=edit=-
Damn necroposting fkers again!