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[Marks DTM Calib]

S'pose I should look where my DPF is. Is it that rather huge thing just after the 2 bank's exhausts meet about halfway down, with extra pipes and shit going to it?

Want to change the oil in another couple of thousand. Reckon its Jag only, and they'll want me bent over the coffee machine, in the reception position?

I would expect so, generally there is a small pipe connection to the front of it to measure the back pressure. Occasionally there is another after (although god knows why as the post DPF pressure is pretty close to atmospheric on modern cars with free flowing exhausts) .

I would expect Dexos2 would be more than up to the job on the oil front

[TheBoy]

Reckon its Jag only, and they'll want me bent over the coffee machine, in the reception position?

Well, maybe the bumming part, but I doubt the oil is jag only, that 3.0 diesel lump has been doing the rounds for the better part of a decade and is in JLR, pug and shitroen applications, Tesco probably stock it

I know some of the oils for XJ - probably the supercharged, is Jag only, supposedly co developed with Castrol, and only available from Jag outlets.


Obviously, by co developed, I mean a Jag engineer went through the Castrol catalogue, and picked one...

[TheBoy]

I would expect Dexos2 would be more than up to the job on the oil front

I believe spec is A5/B5, and has a Ford style designation.  I think TC do do a couple of Ford spec oils, so was possibly a line I would investigate. Failing that, Halfords have a compliant Mobil1 for £22 for 5l, trade.

[TheBoy]

How does the system measure the amount of shite in the DPF, and clearly can't directly weigh it? Is it pressure differences, and give a calculated amount (% in GM, g in vagcom)?

[tunnie]

How does the system measure the amount of shite in the DPF, and clearly can't directly weigh it? Is it pressure differences, and give a calculated amount (% in GM, g in vagcom)?

VAGCOM can tell me in gram weight, the ash that's been burnt and soot ready to burn. Here is a sample output from my VW:

  IDE00432   Particle filter: time since last regeneration 4798 s
  IDE00433   Particle filter: oil ash volume 0.08 l
  IDE00434   Particle filter: soot mass calculated 6.61 g
  IDE00435   Particle filter: soot mass measured -0.39 g
  IDE00436   Particle filter: kilometers since last regeneration 57443 m
  IDE06059   Particle filter: oil ash volume 33.7 g
  IDE06060   Particulate filter ash load limit 70.00 g

[tunnie]

Soot mass is the build up, it never really goes above 10g from what I've seen. The higher this figure the worse it is for exhaust gas flow I think

[tunnie]

Shows I should plug in more, your post reminded me I should do a plug in. Good news no fault codes, but DPF is higher than I've seen it before. The again it's been about 177 miles since it's done a re-gen.

So the other day with high idle, must have been the heat/climate reasons 

I'm doing a long run tomorrow so will do another plug in later in the week. But this time I also checked the pressure:

  IDE00427   Particle filter: difference pressure 7 hPa
  IDE00428   Particle filter: offset for differential press. 1 hPa
  IDE00432   Particle filter: time since last regeneration 24205 s
  IDE00433   Particle filter: oil ash volume 0.09 l
  IDE00434   Particle filter: soot mass calculated 17.84 g
  IDE00435   Particle filter: soot mass measured 3.64 g
  IDE00436   Particle filter: kilometers since last regeneration 285736 m
  IDE04650   Particle filter: differential pressure: dynamic offset 2 hPa
  IDE04652   Exhaust gas jet volume in particle filter 29.5 m³/h
  IDE05853   DPF statistics: current avg temperature after part filter 238.4 °C

[TheBoy]

Tunnie - I was curious *HOW* the system knows/calculates, not the functionality of the scan tool.  As it's not able to actually weigh anything...

[tunnie]

Fairly sure it's pressure in vs out and it estimates.

[Marks DTM Calib]

Tunnie - I was curious *HOW* the system knows/calculates, not the functionality of the scan tool.  As it's not able to actually weigh anything...

Its based on back pressure (hence the pressure sensor), the ash content is an guesstimate based on post DPF regen back pressure, mileage etc

[TheBoy]

Tunnie - I was curious *HOW* the system knows/calculates, not the functionality of the scan tool.  As it's not able to actually weigh anything...

Its based on back pressure (hence the pressure sensor), the ash content is an guesstimate based on post DPF regen back pressure, mileage etc

Merci