[F104]

Originally Posted by Thud

I wish there was a clearer indication of when a regen is taking place.

yes I think that's a shortcoming too. It could be dumping fuel in the tailipe all the time, trying to regenerate, not getting anywhere, and most would not even know.
Maybe something could be done with coding, a flashing light or something. From what i see normal exhaust temps are up to 350C. 450C is well above normal and indictates it is starting, or trying to regen. Regen works reliably above 500C, and ideally it tries to keep 600C. My OBD reader flashes LEDs at 450/500/550

Originally Posted by Ron1n

I picked up the car this morning, and I thought I'd share the notes on the tech sheet. I think there's some good solid information for all of us, regarding regen, backpressure, .

Interesting to see BMW still tries to force a regen before DPF replacement. I believe the reason it did not do it is because the ECU estimated there is too much soot in the DPF, if it would start a regen the risk on an uncontrolled exothermic reaction would be far too high
If you have a BT tool, it shows estimated DPF soot loading.

[F32Fleet]

Interesting information. THANKS!

[Ron1n]

Originally Posted by F104

yes I think that's a shortcoming too. It could be dumping fuel in the tailipe all the time, trying to regenerate, not getting anywhere, and most would not even know.
Maybe something could be done with coding, a flashing light or something. From what i see normal exhaust temps are up to 350C. 450C is well above normal and indictates it is starting, or trying to regen. Regen works reliably above 500C, and ideally it tries to keep 600C. My OBD reader flashes LEDs at 450/500/550



Interesting to see BMW still tries to force a regen before DPF replacement. I believe the reason it did not do it is because the ECU estimated there is too much soot in the DPF, if it would start a regen the risk on an uncontrolled exothermic reaction would be far too high
If you have a BT tool, it shows estimated DPF soot loading.

I didn't see that in the BT....can you point out where, please?

[F32Fleet]

Originally Posted by F104

yes I think that's a shortcoming too. It could be dumping fuel in the tailipe all the time, trying to regenerate, not getting anywhere, and most would not even know.
Maybe something could be done with coding, a flashing light or something. From what i see normal exhaust temps are up to 350C. 450C is well above normal and indictates it is starting, or trying to regen. Regen works reliably above 500C, and ideally it tries to keep 600C. My OBD reader flashes LEDs at 450/500/550



Interesting to see BMW still tries to force a regen before DPF replacement. I believe the reason it did not do it is because the ECU estimated there is too much soot in the DPF, if it would start a regen the risk on an uncontrolled exothermic reaction would be far too high
If you have a BT tool, it shows estimated DPF soot loading.

sounds like a fix in search of a problem. I'm going to guess that those with a tune may have to be cognizant of incomplete DPF regen whereas those who do not can drive more and worry less.

[F104]

Originally Posted by Socom

sounds like a fix in search of a problem. I'm going to guess that those with a tune may have to be cognizant of incomplete DPF regen whereas those who do not can drive more and worry less.

Mine is tuned -that's partly why kep an eye one it. But too me short distances is the problem. it's not the little additional fuel resulting from a tune & when you push it. Most diesel tunes give effectively better constant speed economy - mine does.

Originally Posted by Ron1n

I didn't see that in the BT....can you point out where, please?

this section is just under the "battery" one. PS Fuel used since last regen is correct, distance is a factor 100 too low, and has a rounding error too (i'll try imperials - see if that is the issue). As car is cold, sitting in my garage, i did not select any other values

[Ron1n]

I've had problems with any values showing up, but I'll play with it a little later and see what I can see on mine.

[Ron1n]

Far from an ideal launch (I let it shift at it's programmed max for a reason....ideal shifts are closer to 4k), but this is today, as compared to before:

[Ron1n]

FYI, the car is back at the dealership, with exhaust pressure error codes. This started happening within a week of returning it. I'm hoping it's just a bad new DPF. I've run the car an extended period of time at a static rate of speed on the highway for an hour in an effort to force a regen, to no avail in fixing the issue.

We'll see what they have to say.

UPDATE: This turned out to be a loose tube to the gas pressure sensor that they put on wrong. This was fixed once I took the car back in and they rerouted it the way it was supposed to be.

[Ron1n]

So, an update to all this. It seems since all the work they've done, the gas pressure sensor is a lot more sensitive than it used to be. I ran into an issue this weekend with JBD installed where the car was shaking violently on start-up (previously, the car didn't idle smoothly when cold, and I assumed it was just that the DPF was clogged). The car got to the point where it wouldn't start, just turn over.

There is definitely more soot injected into the car, and there's definitely an issue with the car not being taken for long enough drives to force a regen (although, I do a 60 mile run every two weeks to go pick up my son, so....).

I'm going to strongly suggest you keep an eye on your cars if you're running a JBD (I'm not calling the JBD out...but I can tell you that once taking it off, the car started and ran like it should, sans some power at stock because of the potentially clogged DPF).

The car, though, did just fine walking an Evo IX this morning with almost no effort (modded with at least an exhaust and intake....probably more, from the way the car was decked out).

Car goes into the dealer tomorrow morning to take a look at things. I just wanted to put out a warning about how tunes *may* affect the DPF, regeneration, car drivability, etc. This is not a finger pointing at any of the manufactures themselves. Like any tune, it's the owner's obligation to take the risk associated with installing one....the difference for us is that we're a lot less experienced in how the tunes affect our cars specifically.

If I had my druthers, the DPF and all associated parts would be ripped out, so that we could see what this car could really do.....soot be damned!

[rakimb17]

Keep us posted. I'm waiting to put more miles on my D before I tune.
But I drive 40 miles each way to work everyday. So I would think that would be enough to regen if I set the cruise once every few days.

[Kaylin032]

Originally Posted by Ron1n

The DPF is covered by the 8 yr/80k emissions warranty..thank goodness. I've heard the damn part costs like $1500!

I bet a fair number of people have removed theirs... and put them to use as paper weights or rolling pins for making biscuits.

Could probably find used ones in good shape.

[Ron1n]

We'll see what happens. Other work to be done first.

Side note: 2 things wrong that were determined at the dealership:

1. My gas sensor hoses have deteriorated, and needed to be replaced ($161)
2. My glow plugs and glow plug control unit is causing an SES. The replacement is $1400. I'm currently seeing if BMWNA will foot the bill, since the car only has 58k (no, I didn't get the extended warranty, only the extended maintenance. I figured this being a diesel, the warranty wouldn't be necessary).

I don't know if the gas sensor hoses having deteriorated at 58k has anything to do with tunes on the car (and the car has been tuned for most the 2 years I've owned it), but I suppose it's a possibility. The glow plug stuff shouldn't be tune related at all, though.

[SomeRandomer123]

Originally Posted by Ron1n

We'll see what happens. Other work to be done first.

Side note: 2 things wrong that were determined at the dealership:

1. My gas sensor hoses have deteriorated, and needed to be replaced ($161)
2. My glow plugs and glow plug control unit is causing an SES. The replacement is $1400. I'm currently seeing if BMWNA will foot the bill, since the car only has 58k (no, I didn't get the extended warranty, only the extended maintenance. I figured this being a diesel, the warranty wouldn't be necessary).

I don't know if the gas sensor hoses having deteriorated at 58k has anything to do with tunes on the car (and the car has been tuned for most the 2 years I've owned it), but I suppose it's a possibility. The glow plug stuff shouldn't be tune related at all, though.

Our 330d had to have a new glowplug control unit at 58k miles too!! It also had violent, shakey, misfirery start-ups.