Why delete the EGR? - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 05-17-2011, 11:27 AM   eBay Motors  #1 (permalink)
 
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Why delete the EGR?

I keep reading forums and post about deleting the EGR but I cannot find a reason why. Can anyone help me on this? I just bought my first Duramax and am trying to get a good understanding. Also if I delete it do I need to have EFI reprogrammed to block a code?
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Old 05-17-2011, 11:30 AM   eBay Motors  #2 (permalink)
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Good for the motor and you can gain 30 - 60 rwhp depending on tuning. That's the general concensus anyway.
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Old 05-17-2011, 11:34 AM   eBay Motors  #3 (permalink)
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I believe the reason people delete it is because:

A: it is just another emmissions piece they dont wanna deal with
B: it recirculates old exhaust gas into the engine-which most dont want.
C: its one less failure you have to be concerned about. I know fords have problems with EGR coolers....not cure about GM.

There may be other reasons.....might gain some performance. Oh and yes, ifs the EGR is gone....you have to have a way to turn it off, otherwise you will have a check engine light on cause ECM is looking for egr and there is none!
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Old 05-17-2011, 11:34 AM   eBay Motors  #4 (permalink)
 
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So if I do delete I need to re-tune EFI to notice the change? Can EFI block that code?
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Old 05-17-2011, 11:37 AM   eBay Motors  #5 (permalink)
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Quote:
Originally Posted by VtecGSR95 View Post
I believe the reason people delete it is because:

A: it is just another emmissions piece they dont wanna deal with Frees up some room too!
B: it recirculates old exhaust gas into the engine-which most dont want. Which is why it's good for the motor.
C: its one less failure you have to be concerned about. I know fords have problems with EGR coolers....not cure about GM.No big issues with failures I don't think.

There may be other reasons.....might gain some performance. Oh and yes, ifs the EGR is gone....you have to have a way to turn it off, otherwise you will have a check engine light on cause ECM is looking for egr and there is none!
You most definitely will gain hp. People have dyno'd before and after to prove it.


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Originally Posted by garrecr View Post
So if I do delete I need to re-tune EFI to notice the change?
You just need to disable it, don't think you need to do any special tuning just because you delete it. EFI Live will do that for sure.
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Old 05-17-2011, 12:30 PM   eBay Motors  #6 (permalink)
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Lets pretend I didn't type anything here. Sorry to have taken up the space.
Later
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Old 05-17-2011, 12:43 PM   eBay Motors  #7 (permalink)
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The main benefit is to reduce soot getting back into the motor thru the exhaust. Especially if your running a tuner of some sort, the more black smoke out the exhaust, the more the EGR will pump it into your oil. It mostly helps with oil change intervals, sensor life, & overall engine longevity. I dont know anything about adding hp. I did it went I put my exhaust and CAI on, and dont believe I picked up any extra hp. with that mod. Also, if you go the EFILive route with tuning, you or your tuner can disable that function so it doesnt throw any codes.
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Old 05-19-2011, 08:41 PM   eBay Motors  #8 (permalink)
 
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diesels make power by compressing via turbo, cold fresh air into the engine, hot exhaust gases cooled to engine temps (around 200 degrees) don't do a diesel much good.
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Old 06-14-2011, 10:31 PM   eBay Motors  #9 (permalink)
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How would deleting the egr affect the engine in cold weather? During the winter we can hit -40. Will not having an egr cause problems with cold weather drivability or starting??
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