Another regen is out of the way now.
It took place approx 700km since the last one.
Previously, it started at 80.5% clogging, ended at 12% clogging
Today, it started at 80.31% clogging, ended at 11.3% clogging
I have noticed on another occassion that the regen happened after around 80% clogging had been reached.
This is a 'new' dpf, as far as the car is concerned. The clogging % ran from 0% to 80%, at roughly 5% per hour of driving time, or about 16 hours, perhaps a little more, which is about right for the amount of time which I've spent driving.
The regen also took place while the low fuel warning light was on. I've mentioned this previously but I wanted to see it happen again and it just has. The 'Limited Cruising Range' alarm came on during the regen, and the regen continued regardless. I think it's fair to say that a system generated regen doesn't require the tank to be full to any specific level in order for it to initiate the regen, at least not with the version of software I have.
I also took the time to confirm that raising the revs lowers the dpf regen temperature. Peak temperature was 700 celsius, in 6th gear at 70mph, on overun, downhill. Every time I dropped a gear the revs rose and the dpf temperature fell. That happened whether the car was under load or on overun.
Copied the graph to here regen7_11 | Flickr - Photo Sharing!
I'm certain the 'average time of last 5 regen' is retrospective data, not scheduling data like I had speculated about this morning.
There was a puff of blue smoke when regen began, exactly as it always had done before I drilled the dpf. You'll see from the graph that the bottom line, regeneration duration, has a small step shortly after it begins, which is the preheating phase of regeneration, just like you see with a forced regen when the revs rise up to 2500rpm and hold there for a while before rising again.
The smoke lasted for as long as usual, about 15-20 seconds, and wasn't at all dense. Because it was blue smoke, it seems to me to be merely the oil deposits in the rear section of the exhaust burning off as the temeprature rises, which is the same as it always has done for any other regen.
There doesn't appear to be any noticeable improvement in performance after the regen, like I used to experience with a partially blocked dpf, the acceleration is nice and perky and the pick up from low revs is still strong. No ECU faults, no turbo boost control issues