EGR Delete Benefits?

[SupermanX24]

Any benefits to deleting it? And will it create a check engine light?

[NJSPEEDER]

It will turn the check engine light on, but the code can be deleted through programming or there is a resistor(I forget the ohm rating) that can be put inline to make the computer think it is still there.

The benefits of eliminating it are really minimal as far as performance goes. For the most part is it just a few LBS out of the car since the EGR doesn't open in low vacuum(WOT) situations anyway.

-Tim

[chrisfrom nj]

i got rid of the egr on my 88 gmc pick up truck tbi it still rund great the check engine light isnt on

[WildBillyT]

Less cluttered engine bay. Maybe a slightly higher NOx reading at inspection.

[BonzoHansen]

Originally Posted by WildBillyT

A much higher NOx reading at inspection.

Fixed.

[LTb1ow]

And if your referring to the LT1 car, some argue that the EGR is the cause of the leak in the back of the intake.

[Fast92RS]

If the car is a daily driver, then leave it be. The EGR helps lower combustion chamber temperatures. Escpecial during highway cruise. At highway cruise the Air/fuel ratio leans out to conserve fuel but in turn that creates higher temperatures which will make the engine run hotter. Thats when the EGR opens up to lower the temperature to prevent a over heat condition or even worse melting a piston.

[WildBillyT]

Originally Posted by Fast92RS

If the car is a daily driver, then leave it be. The EGR helps lower combustion chamber temperatures. Escpecial during highway cruise. At highway cruise the Air/fuel ratio leans out to conserve fuel but in turn that creates higher temperatures which will make the engine run hotter. The EGR lowers those temps to prevent a over heat condition.

And if I remember correctly, EGR is not working at WOT.

[SupermanX24]

so in other words, you guys are suggesting if it's going to be daily driven just leave it in there, and if it's going to be raced take it out?

[WildBillyT]

Originally Posted by SupermanX24

so in other words, you guys are suggesting if it's going to be daily driven just leave it in there, and if it's going to be raced take it out?

That is probably in your best interest.

[Pampered-Z]

Yes, the EGR only opens during constent speed/highway driving. It is not opened during idle, excel or full throttle.

The duration + LSA of a cam will effect cylinder pressure, which is why a LT1 hotcam and more aggressive cams aren't effected by having the EGR,

Tipically all they do to program it out is to raise the speed at which it activates. I think the highest is 250MPH. So if I go over 250MPH, I'll throw an EGR code.

Most delete the EGR when they go bad, because they are such a pain to work on. If the valve sticks open it will kill the performance.

[BonzoHansen]

What makes an LT1 egr setup hard to work on, compared to earlier or later engines?

[Pampered-Z]

Originally Posted by BonzoHansen

What makes an LT1 egr setup hard to work on, compared to earlier or later engines?

It's in the back of the intake, so it's under the cowl against the firewall. No way to see what your working on, if the port is clogged or carbon'd up you need to pull the intake off to really work on it!

[BonzoHansen]

4th gens FTL.

[sweetbmxrider]

Originally Posted by Shownomercy

And if your referring to the LT1 car, some argue that the EGR is the cause of the leak in the back of the intake.

who is arguing that it isn't?

they aren't that bad to work on LT1's, if you have a lift and some luck!

[LTb1ow]

Originally Posted by sweetbmxrider

who is arguing that it isn't?

they aren't that bad to work on LT1's, if you have a lift and some luck!

A lot of luck at that. I deleted mine, it was a pain to work around, and the stupid tube was real tight with LTs.

[sweetbmxrider]

yeah i got lucky and it unbolted and bolted right up, but i am doing my intake manifold gasket this weekend sooooooo damn it!

[69BirdX]

keep it on you wont see any performance. The engine runs coolers with the Egr being used. If you dont belive me then ill prove it with theory but im lazy at the moment

[LTb1ow]

How is that possible? It pumps exhaust back into the intake.

[sweetbmxrider]

i was thinking the same. lets hear the theory.

[LTb1ow]

I guess it leans out the mix and that coulllddd lower temps, but if its running fine before the EGR its not really needed....

[Featherburner]

Sounds like you guys need to read up on how the EGR system works.

[LTb1ow]

Perhaps, but I dunno, it ain't there so I don't care. LOL.
Any one care to fill me in?

[BonzoHansen]

[Fast92RS]

Originally Posted by Shownomercy

I guess it leans out the mix and that coulllddd lower temps, but if its running fine before the EGR its not really needed....

EGR does not lean out the mix. Lean Air/fuel mix burns extremely hot. I can't explain the science behind why recirculating burned exhast gas back into the combustion lowers temperatures but it does.

EGR works by recirculating a portion of an engine's exhaust gas back to the engine cylinders. Intermixing the incoming air with recirculated exhaust gas dilutes the mix with inert gas, lowering the adiabatic flame temperature and (in diesel engines) reducing the amount of excess oxygen. The exhaust gas also increases the specific heat capacity of the mix, lowering the peak combustion temperature. Because NOx formation progresses much faster at high temperatures, EGR serves to limit the generation of NOx. NOx is primarily formed when a mix of nitrogen and oxygen is subjected to high temperatures.