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TDI (Diesel) Emissions This is a discussion about emissions from TDI's. Pro's cons of Diesels (including biodiesel) effects on the environment and how they compare to Gasoline and other fuel sources for Internal combustion engines.

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Old June 21st, 2016, 09:08   #16
FVWVWF
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Quote:
Originally Posted by mydecember1985 View Post
I certainly feel mine regen. It's not a "limp mode" feeling but as you say, it feels like a headwind. Occasionally I get little spurts or power surges that make then engine react a little strange.
Same here.
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Old June 21st, 2016, 12:25   #17
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My car feels like it has more pep during a regen. Idling at a stop light during regen, my car shakes a little bit.
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Old June 22nd, 2016, 16:52   #18
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Quote:
Originally Posted by mydecember1985 View Post
I certainly feel mine regen. It's not a "limp mode" feeling but as you say, it feels like a headwind. Occasionally I get little spurts or power surges that make then engine react a little strange.
Just had the 40k mile service done, so everything is up to date.
Exact same for me.... I also have the PF03 and I can "see" based on the codes when it's doing a regen and what kind, but I can almost always "feel" those little surges before I visually confirm it's in a regen.

Mine got a new fuel system a year ago due to lift pump corrosion/contamination (not an actual HPFP failure, but they basically handed it the same and replaced all of the same stuff, including the HPFP) and I noticed it happening before that, and it was no different after.
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Old June 23rd, 2016, 18:29   #19
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Originally Posted by FVWVWF View Post
Same here.
Same for me, rough idle / stumble once or twice if in city traffic
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Old June 25th, 2016, 18:18   #20
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The only way I know regen is happening while driving is because I monitor various temps with Torque. I see that the cat and another are running about 1000degreesF. Otherwise when I stop, the fan is running to cool everything down.

As someone mentioned, my trip mpg might be down a bit but often that is hard to notice as that can vary on weather, number of stops, length of trip, etc.
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Old June 26th, 2016, 19:58   #21
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Most definitely feel mine. There seems to be a few different regens.

1000 rpm idle. Much better throttle response and torque. Feels like it has a tune.

Sometimes its like that guy up there said, a washer full of bricks.

Sometimes its kinda doggy feeling.

It most certainly isn't transparent in any case.
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Old July 3rd, 2016, 21:23   #22
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Assuming all are cars are the same, your car does not have some other issue,
You have some great sensitive seat of the pants senses. No I can not tell I am
having a regeneration during freeway sustained driving. You should not feel
loss of power. That is not normal.

I have a Scangauge II, monitor my EGT pre Turbo (the highest one). While
driving NO REGEN, normal freeway cruise EGT is about 600F to 900F
depending on road, flat, going up hill, accelerating, etc. These are ball park
numbers. However during REGEN you see sustained high EGT reading
well over 1100F to more like e 1200F or higher.

You will see at idle EGT in the 400F to 500F normally. If stopped at idle,
during Regen EGT will still be much higher 900-1100F. As mentioned
the idle is higher.

All the REGEN does is inject extra fuel later to cause the fuel to burn rich
and in the exhaust, raising the EGT. That high Temp is used by the DPF to
REGEN the soot into ash and water. If you are paying attention to your
current MPG you will go down during REGEN; you are burning more fuel.

If you can sense a REGENS while driving that is pretty good. However if you
feel it is down on power significantly, that is not normal.
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Old November 25th, 2016, 07:42   #23
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On the highway, it's generally not really noticeable. In town, stop and go, oh yes definitely. And I've seen EGT's get up to 1500F, assuming my xgauge was set correctly.
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Old November 25th, 2016, 08:41   #24
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ive watched a few regens happen with my vcds ,most it doesn't affect the drive , but around town it sounds like the air filter is loose/missing,it has that sort of engine sound too it. the last one I had was Wednesday and Thursday,it started just before my journey end, I could hear it,when I stopped the car ,no fan running ,next morning I had a short trip it started again and it stopped when I got home ,then that afternoon it started again around town , so I drove it for 3-4 miles on country roads and it then finished the regen, typical temps are around 700-800, never seen any higher than that,i do use a combination of a cetain booster and a fuel conditioner /pump lubricant , that's probably the reason temps are lower!.
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Old November 25th, 2016, 12:26   #25
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Your temps are probably in Celsius.
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Old November 25th, 2016, 14:22   #26
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bhazard,your right I forgot that there are differences in models and countries in terms of what they read out. all my dpf readings are in grams,yours are in mls.
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Old November 28th, 2016, 13:14   #27
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Definitely can tell when regen is running. Better yet I'm starting to notice the difference between LNT and DPF regens. Either case light load between about 35 and 45 I can consistently make the car "hiccup". Sometimes you get a little jerk when regen starts. DPF regens seem to have bigger effect on MPG than LNT regens.

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Old October 22nd, 2019, 06:25   #28
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Where does the fuel come in to burn the soot off the DPF? Is it from the injectors in the combustion chamber? Or is it after the turbo which I guess would mean it would have its own fuel supply? When I read about temperatures going into 4 digits I have a visual that the oil is being cooked significantly if in fact the source of the extra fuel comes from the injectors.
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Old October 22nd, 2019, 09:18   #29
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Injectors, late in the combustion cycle IIRC.
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Old October 24th, 2019, 06:17   #30
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When regenration occurs while driving, say city driving where the cooling is not ideal, does the temperature gauge show an increase in temperature? If there is no increase then is it safe to say that all the 1100F-1400F heat is downstream from the combustion chamber?
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