EGR info needed

[moss6]

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I've got an 06' LBZ and am looking at exhaust mods for mpg/reduced heat/added power; in that order of importance. Also do not want any extra exhaust noise if possible. From what I've been reading an EGR blocker may be needed to address the possible code setting issues. That doesn't sound good! This also leads me on a quest to get full understanding of the EGR system and all the effects-disadvantages-advantages of disarming the system. Any help from someone who has a complete understanding would be greatly appreciated.
Thanks

[Kennedy]

Here is a brief overview:

http://www.kennedydiesel.com/docs/Du..._Emissions.htm


IMHO, a cat back system is a waste of money. A full system will produce fair gains in performance, but nothing stellar. The 06 trucks are pretty darn quiet regardless of exhaust system.

[moss6]

So the EGR is valved and is opened/closed by the ECM? I assume the blocker plate would need to be removed if you take the truck in for any powertrain service.

[Duramaster]

HA HA HA HA............... Thispost reminded me of a customer that bought a new 2005 LLY and IMMEDIATELY took out and cut up the old exhaust system so that he could install some BIG OL' exhaust system!!!! Sounded great but the ECM cut the power back to only 2/3. HA HA HA.

All I'm saying is that you need to have a certain amountof back pressure for the EGR system to work properly. When the valve opens, It compares the MAF sensor values between a closed valve and an open valve.

Here is a description of operation taken right from GM SI.....................



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Exhaust Gas Recirculation (EGR) System Description
The Exhaust Gas Recirculation (EGR) System is used to reduce the amount of nitrogen oxide (NOx) emission levels caused by high combustion temperatures. At temperatures above 1 371

[Shed]

Duramaster,
So when I put my 4" exhaust on my 01' and pulled for the first time, I hit a hill and about half way up she went into limp mode with the SES light on. Long story short, code pulled was an overboost code. Dealership said due to the larger exhaust and intake (airaid). Said there was nothing they could do about it, but said maybe an 02' "reflash" would take care of it. JK of Kennedy diesel suggested his custom tuning, which I really like the sound of, but of course with 4 kids money is tight for MY toys! Just wondering what your expirienced take is on my problem. Thanks for any help.
Shed

[Kennedy]

Duramaster,
So when I put my 4" exhaust on my 01' and pulled for the first time, I hit a hill and about half way up she went into limp mode with the SES light on. Long story short, code pulled was an overboost code. Dealership said due to the larger exhaust and intake (airaid). Said there was nothing they could do about it, but said maybe an 02' "reflash" would take care of it. JK of Kennedy diesel suggested his custom tuning, which I really like the sound of, but of course with 4 kids money is tight for MY toys! Just wondering what your expirienced take is on my problem. Thanks for any help.
Shed

This can be done in a simple 2002 stock flash also, but may as well go for the gusto...