ok guys these headers im looking at did come off from a 2.8 camaro but they do not have the provisions for the egr system. how beneficial is it to our cars anyways. right now the vacumm lines going to my egr have been broken off but the car is still running great. everyonce in a while ti throws a code for it but it runs normal. if i get these headers could i just delete the egr system and the little pipe that goes to the exhaust manifold and the little flex pipe that goes to the intake?

 

The system increases HP, the system increases MPG and the system increases engine life by relieving the otherwise higher combustion temps. Lower temp, longer life.

Yes the system help emmisions, but it does a whole lot more.

 

It only works at part throttel it should be closed at idel (or you will lose vacc and stall) and wot.
It helps lean out and lower chamber temps when you cruse getting you more gas milage.
The bad thing it does is fill your intake and heads with carbon, it's the only big dirty draw back.
If you have a nice smoothly ported intake and heads like me, I say toss it.

 

Doesn't increase HP, but does increase MPG. HP is measured @ WOT, where the EGR doesn't work anyway.

Since the EGR does lower combustion temp, you can run more timing at cruise and get better milage though.

If the engine is running correctly, it doesn't increase life either. if you have a properly working cooling system, then engine temp. doesn't change all that much. Some cars don't have EGR because they are efficient enough to pass emissions and EPA milage standards without it.

 

if you lean out the a/f you run hotter so it wouldn't lower compression temps at that poit

 

I think he may have misworded that just a tad... I wouldn't say EGR really leans out the mixture enough to count for anything, but as mentioned it definitely does cool the cylinders, I'm assuming by introducing spent, noncombustible gases that are not going to heat up and burn like the rest of the mixture is, so those spent gases are going to be much cooler. Kind of like A/C for your cylinders.


Keep the EGR unless you ABSOLUTELY have to get rid of it. I've got all kinds of aftermarket parts, and my heads aren't even supposed to be used with EGR. But my EGR system is still hooked up and operating. Car runs funny without it, as a matter of fact. KEEP IT!

 

That is exactly the theory...

 

I agree with everything posted above in theory, but in practice there has been no discernable difference in any of the cars I have removed it from, whether permanent or temporary. If EGR improved performance, or helped with anything, why don't you ever see a race car of ANY kind running it? Even GM deletes it on engines that run cleanly enough without it (such as LT4s, 01-up LS1s, etc). Granted, a stock engine in stock tune (set up for emissions) will probably run better with it, but on anything modified, esp with a cam change, its not going to help.

 

In answer to the "Why don't race cars have it?" : Because they don't have to meet emissions and not having the system saves weight. No point if it's not required. The engines are designed for peak performance w/o it.

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I'll just reiterate again...I could tell on my motor. It IS a Ford 5.0.....but it has non emissions heads (Edl Performer RPM)...and even then, you can feel the disabled EGR as SOON as you release the gas pedal. INstead of a smooth transition to deceleration, the engine jerks on the transition. But that's the only difference I notice.