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  #37  
Old 04-03-2014, 09:12 AM
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Re: exhaust system regeneration process

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Originally Posted by TypeRod View Post
I use a ScanGauge 2 as well in my Passat, those things are pretty cool!
The Scanguage II shows EGT at the "Cat" which in our case I assume is the DPF. Its labeled CTF (Catalytic Temp F) or CTC if in Celsius.

The regen process dumps unburned diesel through the exhaust stroke into the manifold, through the turbo and into the DPF. The question is this: Does it ignite in the cylinder during the exhaust stroke or does it travel through the turbo and ignite in the DPF?

The Torque app can see the upstream EGT which appears to be near the turbo as it changes instantaneously. I will monitor it during regen to see if it is the same temperature as the DPF.

FYI, I watched a regen triggered on a short drive where I exceeded 50mph for maybe a minute. I proceeded through sitting at stop lights and driving 45 or less in town then pulling into a parking lot. It held 1000+ F the whole time. 2 minutes of idling kicked it out and temps fell quickly. Normal idle fuel flow is 0.2 to 0.3 GPH and it was 0.5 and higher during regen.
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  #38  
Old 04-03-2014, 10:05 PM
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Re: exhaust system regeneration process

Quote:
Originally Posted by ExcursionDiesel View Post
The Scanguage II shows EGT at the "Cat" which in our case I assume is the DPF. Its labeled CTF (Catalytic Temp F) or CTC if in Celsius.

The regen process dumps unburned diesel through the exhaust stroke into the manifold, through the turbo and into the DPF. The question is this: Does it ignite in the cylinder during the exhaust stroke or does it travel through the turbo and ignite in the DPF?

The Torque app can see the upstream EGT which appears to be near the turbo as it changes instantaneously. I will monitor it during regen to see if it is the same temperature as the DPF.

FYI, I watched a regen triggered on a short drive where I exceeded 50mph for maybe a minute. I proceeded through sitting at stop lights and driving 45 or less in town then pulling into a parking lot. It held 1000+ F the whole time. 2 minutes of idling kicked it out and temps fell quickly. Normal idle fuel flow is 0.2 to 0.3 GPH and it was 0.5 and higher during regen.
I learned something new, I never knew about the unburned fuel bit of info.
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  #39  
Old 04-04-2014, 03:00 PM
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Re: exhaust system regeneration process

I am currently looking into purchasing an ecodiesel and would like to hear from anyone who drives primarily in the city. I live in NYC and am concerned about not being able to get enough highway driving during the week to clear out the DPF. Any advice would be helpful. Thanks!
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  #40  
Old 04-04-2014, 05:53 PM
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Re: exhaust system regeneration process

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Originally Posted by PotatoHead View Post
I live in NYC and am concerned about not being able to get enough highway driving during the week to clear out the DPF. Any advice would be helpful. Thanks!
How many miles and how long does it take for your daily commute?

I'm not from New York but I have run mine exclusively in town for a whole week when I was off for the Holidays. We did a lot of shopping that week. The DPF is good for at least 6-10 hours of runtime without a regen by my estimation, maybe more. It is important after that to get above 45 mph for 20 minutes. Also, long warmups go against that time...so after 5 minutes, you'd want to go ahead and drive. IMO, if you don't drive at regen speeds and distances regularly, a modern diesel may not be the best choice. If you do, diesels are a great option.
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  #41  
Old 04-05-2014, 09:08 AM
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Re: exhaust system regeneration process

Can or does the EVIC show the percentage full of the DPF ant any given moment, so that if you see it filling up you could plan a hwy trip in the next day etc to aviod limp mode?
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  #42  
Old 04-05-2014, 09:38 AM
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Re: exhaust system regeneration process

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Originally Posted by Stbentoak View Post
Can or does the EVIC show the percentage full of the DPF ant any given moment, so that if you see it filling up you could plan a hwy trip in the next day etc to aviod limp mode?
Unfortunately there is no EVIC display except the final warnings which we now know means "drive NOW". You could possibly wait...but If you procrastinate, the DPF could fill up and your Jeep then goes into limp mode.

If you use an ODBII display device to monitor Exhaust Gas Temperature, you may notice 2 things before the DPF gets to the EVIC warning level. The EGT will be over 900F steadily for more than a few seconds because its trying to regen often but can't. An ODBII warning code P02522 (I think) will set stating too many regens have been attempted. I saw this using the Torque App with no EVIC or other lights. This is all occurred on mine and I never got a warning because I finally let it finish its regen on a short highway run.
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  #43  
Old 04-05-2014, 12:36 PM
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Re: exhaust system regeneration process

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Originally Posted by TypeRod View Post
Thanks for the replies! I believe its pretty much the same for my TDI as well. If you interrupt it a certain amount of times in a row, a CEL will light up (I think...) and the stealership will have to force a re-gen thru s/w.

I totally understand that the turbo can take those temps, but its oil coking within the turbo during those extreme temps that should be concerning. Then for example you don't know a re-gen is happening, then you just arrive at your destination during a re-gen, then park the vehicle and shut it off. Having those super high temps in the turbo then shutting the engine off is the concern for me. IMHO, I would have to say if at all possibly NEVER turn off the engine during a re-gen, and that its not ok to do so. But thats just me, I'm a car enthusiast and I like to take care of my vehicles. Thats just my 2 shillings. lol
TypeRod: Not sure about the TDI but on the JGC VM engine, the turbo is liquid cooled which should help to prevent oil coking.
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  #44  
Old 04-05-2014, 01:00 PM
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Re: exhaust system regeneration process

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Originally Posted by wapshuffle View Post
TypeRod: Not sure about the TDI but on the JGC VM engine, the turbo is liquid cooled which should help to prevent oil coking.
Hi wapshuffle, thanks for that info! Not to assume, when a turbo is liquid cooled, does that mean it is cooled by both oil and coolant? I'm not sure about the turbo in my TDI.
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Old 04-05-2014, 01:14 PM
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Re: exhaust system regeneration process

Hmm, good question. You know what they say about assuming. Perhaps some reading on garret or Honeywell turbos will answer the question. See ALLPAR.COM for info on the VM 3.0 diesel in the v6 engine section.
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Old 04-05-2014, 02:01 PM
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Re: exhaust system regeneration process

One other dumb question for the day...
If you do say a partial regen..( say for 10 of the 20 min potentially required.. then shut down or park somewhere...) Does that count towards getting a full regen done, or does it only work if you start and complete one 20 min cycle continuously....?
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Old 04-05-2014, 02:33 PM
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The regeneration are all "1000@ km when its work are importand not make the car off, drive this 10 min for finish the regeneration.
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  #48  
Old 04-05-2014, 02:44 PM
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Re: exhaust system regeneration process

Quote:
Originally Posted by Stbentoak View Post
One other dumb question for the day...
If you do say a partial regen..( say for 10 of the 20 min potentially required.. then shut down or park somewhere...) Does that count towards getting a full regen done, or does it only work if you start and complete one 20 min cycle continuously....?
Since all this concern has arisen, I have began watching my EGTs for patterns that indicate the frequency and duration. The other day when mine was trying to regen in town every time I made a short trip, I finally drove on the interstate and the regen finished in 9 miles. I suspect each partial regen burned off some soot. I'll keep watching.
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