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TDI Fuel Economy Discussions about increasing the fuel economy of your TDI engine. Non TDI related postings will be moved or removed.

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Old September 7th, 2017, 23:14   #16
Diesl
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Kerma, this is the 2009-2014 ECU firmware you are talking about? Asking because the previous poster threw a 2015 into the discussion.
If it is indeed the gen.1 firmware update you looked at: what are they doing about nitrogen storage cat regeneration? How often does it run now, with the new larger storage cat?
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Old September 8th, 2017, 09:20   #17
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yes, cjaa/cbea

nox regens are designed to trigger concurrent with DPF regens. It manifests as a "stage" of "the" regen. just like before. You won't know the difference of which "stage" of regen is actually occurring at any one moment unless you watch all the egt readings to see how they change in relation to each other as the regen(s) proceed. The internal models are tweaked to make sure the dpf is always the limiting factor for this. The whole thing is meant to be transparent to the driver. You probably won't notice anything different from before the fix, just driving around.
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Old September 9th, 2017, 17:30   #18
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Default TDI fuel economy acronyms and abbreviations

Is there a glossary of TDI acronyms and abbreviations used on this forum? If "a little reading" is suggested, please give the specific reference.

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Originally Posted by KERMA View Post
yes, cjaa/cbea

nox regens are designed to trigger concurrent with DPF regens. It manifests as a "stage" of "the" regen. just like before. You won't know the difference of which "stage" of regen is actually occurring at any one moment unless you watch all the egt readings to see how they change in relation to each other as the regen(s) proceed. The internal models are tweaked to make sure the dpf is always the limiting factor for this. The whole thing is meant to be transparent to the driver. You probably won't notice anything different from before the fix, just driving around.
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Old September 9th, 2017, 18:03   #19
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http://forums.tdiclub.com/showthread...hlight=acronym

There you go. The search function works as well.
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Old September 10th, 2017, 16:00   #20
Diesl
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Quote:
Originally Posted by KERMA View Post
yes, cjaa/cbea

nox regens are designed to trigger concurrent with DPF regens. It manifests as a "stage" of "the" regen. just like before. You won't know the difference of which "stage" of regen is actually occurring at any one moment unless you watch all the egt readings to see how they change in relation to each other as the regen(s) proceed. The internal models are tweaked to make sure the dpf is always the limiting factor for this. The whole thing is meant to be transparent to the driver. You probably won't notice anything different from before the fix, just driving around.
Thanks Kerma, that is very interesting, also the 'just as before'.

So, if I understand you correctly, you are saying that while the engine self study guide made it look like NOx regenerations are happening way more often than DPF regens, in reality the old ('dieselgate', cheating) firmware never scheduled them outside of DPF regens? And that the new NOx cat is now large enough to absorb NOx for the full duration between DPF regens.

That doesn't sound so bad. My DPF regens are now (75k miles) happening every 160 miles or so, a little more frequently than in past years. I should probably plot the distance between regens, since I make Torque save all those logs.

Kerma, if you don't mind: What are the EG temperatures for an NOx regen, as compared to a DPF regen? EGT 4 higher, and EGT 3 lower, or something like that?
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