EGR mod?

[Amphilophus]

I did a search and I am confused as to what you do. some completley disconect the EGR while on zzperformance(I think) it says to just disconect from the exhaust so it can suck in cool air instead of exhaust gas. whitch is it? thanks.

[AllTheGoodNamesAreGone]

the zzp kit comes with a sim and two block off plates..

your remove the entire egr system and use the plates to block off the header side and the intake side..

then you install the sim it plugs into the egr connector and gets spliced into (i belive) the middle line on your map sensor..

[nikon]

Originally posted by AllTheGoodNamesAreGone:
the zzp kit comes with a sim and two block off plates..

your remove the entire egr system and use the plates to block off the header side and the intake side..

then you install the sim it plugs into the egr connector and gets spliced into (i belive) the middle line on your map sensor..

thats one of the kits....one just comes with one plate to block of the exhaust side, but then has nothing to filter air being sucked in by the egr...I shoved a valve cover breather in mine

[BLLDOGG]

i want to know what will happen to the car if you do the egr delete or the modification like what Nikon said

[Amphilophus]

did it make any improvements? the egr cools the combustion chamber temps so deleting it seems pointless. but drawing cooler air in seems to make sense.

[BLLDOGG]

how does drawing hot exhaust gases cool the combustion chamber down?

[AllTheGoodNamesAreGone]

Originally posted by nikon:
thats one of the kits....one just comes with one plate to block of the exhaust side, but then has nothing to filter air being sucked in by the egr...I shoved a valve cover breather in mine

dude.. thats a horrible idea.. do you know what a vacume leak is?? you just made one...

[Wicked 3800 V6]

But if he leaves it wired, should be ok.

Just get the ZZP delete kit

[njp98]

Does the HP Tuners program allow this to be deleted w/o the need for the simulators, etc.?

[AllTheGoodNamesAreGone]

Originally posted by njp98:
Does the HP Tuners program allow this to be deleted w/o the need for the simulators, etc.?

I think so.. you can probably remove the codes and the just block it off with some plates..

i would ask keith first though..

[Amphilophus]

exhaust gas is cool compared to the temp in the combustion chamber. what do you think the EGR does? and if you disconect the tube from the exhaust manifold and leave it it wont create a vacuum leak.

[ReodDai]

the only purpose of the egr is to prevent ping at cruising speeds by regulating the amount of oxygen the engine gets. It regulates this by bringing in exhaust gases to take up volume that would be occupied by oxygen. If you don't want the EGR, get the sim and block the entire thing off. Do not leave it open to bring in cold air thats utterly worthless and will not help you in any way.

[Amphilophus]

Exhaust Gas Recirculation: used to reduce combustion temperature and pressure to control Oxides of Nitrogen emissions

The purpose of EGR (Exhaust Gas Recirculation) is to reduce the NOx emissions. Air is mainly made of oxygen and nitrogen (O2 and N2). At temperatures above 1300°C (2372°F), these molecules split apart and rejoin with each other to make nitrogen oxides (like NO, NO2, etc...). The nitrogen oxides contribute to smog formation.

EGR puts a portion of the exhaust gas back into the intake manifold, so it mixes with the fuel and air. (Note that the exhaust adds to the fuel and air; it doesn’t replace any of it). The added mass in the cylinder is harder to heat up, so the combustion events have lower peak temperatures. The lower temperatures prevent the O2 and N2 from splitting and combining. Even though the exhaust is hot, about 600°C (or 1112°F), it's much cooler than the 1300°C required to make NOx.

In summary, the exhaust adds mass, increasing the heat capacitance of the mixture (i.e. making it harder to heat up the mixture in the cylinder). Peak temperatures are lower, reducing NOx formation, which ultimately reduces smog in the environment.


from:http://www.allpar.com/mopar/emissions.html

[ July 07, 2004, 06:33 PM: Message edited by: Amphilophus ]

[98Camaro3.8]

EGR has nothing to do with the temperature of the exhaust gases. Just like ReodDai said, the exhaust gases add to the fuel/air charge, which causes it to burn less intensely, thereby reducing the temperature.

FWIW, I have the ZZP blockoff plates and simulator and have no problems at all.

[ReodDai]

"If EGR is on during idle, stumble and even stalling will likely result. If EGR is on during hard acceleration, low power (from reduced air/fuel volume) is the result. At part load, lean mixtures for economy create high combustion chamber temperatures and without EGR, these conditions not only create Nox, they also foster pre-ignition and pinking." This was the part I was getting at.
"If the engine stumbles or stalls at idle or lacks power under load, EGR may be staying on and not shutting off. On the other hand, if the engine is pinking at cruise, EGR may not be turning on to cool down combustion chamber temperatures. "

The rest is relatively irrelavent. Also my point of leaving one part open to the air still holds true.

http://www.fordscorpio.co.uk/egr.htm