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.
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.
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...
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.
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.
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.
Just ordered the GDE tune. I missed that reference in the Land Rover article earlier about how it's low pressure EGR system uses post-DEF exhaust gases, resulting in less diesel soot.
I also read that Volvo white paper and I'm thinking that approach must be similar to how GDE achieves a tune that results in negligible Nox levels without the EGR, they do so via the SCR.
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.
Almost guaranteed that it will. Many users running bone stock have reported mileages in the upper 5 figures with no failure due to EGR. Of course, since it's engine components that would fail, you're more likely looking at the 5 Year/100k mile powertrain warranty than anything else.
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