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Pampered-Z · 11-07-2008, 01:04 PM

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.

11-07-2008, 01:04 PM	#11
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	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. __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!