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Old 07-06-2015, 09:01 PM
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EGR is lovely, ain't it?

The Evil Of EGR On Diesel Engines - Diesel Power Magazine

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Old 07-06-2015, 11:31 PM
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Re: EGR is lovely, ain't it?

Yeah, and what's worse is when you combine it with CCV oily film. Then it turns into like a hardened pancake batter everywhere between where the EGR enters and the cylinders.
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Old 07-07-2015, 08:43 AM
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Re: EGR is lovely, ain't it?

Cursed EPA! I'd like to learn more about GDE's tune that somehow bypasses the EGR and the vehicle remains NOx compliant at inspection time. I wonder if that is just because most places don't test diesels like they do gas cars, and actually measure the exhaust?
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Old 07-07-2015, 01:09 PM
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Re: EGR is lovely, ain't it?

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Originally Posted by AirBull View Post
Cursed EPA! I'd like to learn more about GDE's tune that somehow bypasses the EGR and the vehicle remains NOx compliant at inspection time. I wonder if that is just because most places don't test diesels like they do gas cars, and actually measure the exhaust?
Well, EGR is in place to reduce NOX. Without it, NOX goes up significantly. I'm not sure what reduces it, but I'm sure it's either the injection timing or shaping. But I'm sure you're right about testing diesels. I haven't heard of any states that use a sniffer for them, just visual or OBD-II checks.
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Old 07-07-2015, 01:28 PM
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Re: EGR is lovely, ain't it?

Nox is formed when you have a good hot combustion and Nitrogen and Oxygen combine to form Nox. The problem is that you want a good hot combustion process because it reults in more power/ efficiency & less black smoke. What makes DEF so great is that it allows the combustion chamber to be optimized and the Nox problem to be solved in the exhaust system.

All EGR does is takes inert already burned exhaust gas and injects it back in the combustion chamber. Since it's inert it doesn't contribute to the burn and results in a cooler burn, resulting in less Nox formed. Also less power density, more smoke (more work for DPF), more heat in to cooling package, etc...
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Old 07-07-2015, 01:40 PM
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Re: EGR is lovely, ain't it?

seems like SCR is a technology that can more than cope with NOX emissions... check out this article on Navistar's costly blunder with EGR. I wonder why VM Motori is using a combination of EGR and SCR to meet emission standards when SCR is fine.

Years Later, Navistar Is Haunted by a Big Engine Blunder - Businessweek

Volvo explains the difference in systems
http://www.volvotrucks.com/SiteColle...EGR_041609.pdf
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Old 07-07-2015, 04:11 PM
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Re: EGR is lovely, ain't it?

Had a ECU re-map done recently which included an electronic EGR delete.

Time will tell.

With the EGR delete and the Provent 200 catch can, I'm tipping the engine should be enjoying it!!!!!

Cheers, Craig
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Old 07-08-2015, 02:28 PM
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Re: EGR is lovely, ain't it?

Has anyone pulled their MAP and checked it? I am thinking about it after that article.
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Old 07-12-2015, 09:14 PM
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Re: EGR is lovely, ain't it?

Does our EGR pull from before or after the DPF?

I guess the Range Rover diesel has their EGR pull from after the DPF, presumably so less soot gets into the EGR system and potentially less clogging over time.

http://blog.caranddriver.com/diesel-...-u-s-for-2016/
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Old 07-13-2015, 01:19 AM
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Re: EGR is lovely, ain't it?

The GC EcoDiesel does not have EGR?
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Old 07-13-2015, 02:01 AM
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Re: EGR is lovely, ain't it?

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Originally Posted by Pinoiako916 View Post
The GC EcoDiesel does not have EGR?

It DOES have a pre dpf EGR, so not as cool as RR's design. That's why I enjoy my Green Diesel Engineering tune. It's like the EGR is about a half mile after the dpf lol.
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Old 07-13-2015, 04:31 PM
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Re: EGR is lovely, ain't it?

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Originally Posted by Pinoiako916 View Post
The GC EcoDiesel does not have EGR?
???
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