JayGee wrote:

... there is also the additional problem of circulating very hot gas into a plastic intake plenum. I guess as far a emissions are concerned the regen cycle will happen outside urban areas.

JayGee wrote:

Kot wrote:

JayGee wrote:

Hard working a diesel engine on acceleration does not clear the DPF on passenger vehicles and in fact quite the opposite it's a quick way of filling up the DPF with soot

Giving the 2nd ~Turbo a good blow in fact helps to blow out the ash in the DPF, only the soot is burnt off during Passive or Active Regeneration. If the DPF temperature is above 250C Passive Regeneration will burn off most of any soot produced.

its possible you could be happily Regenerating, burning off all your soot, but slowly accumulating ash.

That's the first time I've heard a claim that ash can be blown out of a DPF. One reason not to exercise the 2nd turbo is it adds to the ash load every time you use it ( if it's not had the drain mod).

Phoenix wrote:

JayGee wrote:

... there is also the additional problem of circulating very hot gas into a plastic intake plenum. I guess as far a emissions are concerned the regen cycle will happen outside urban areas.

'EGR cooler' has a function, clue is in the name.
you are right in that the DPF was intended to hold all the soot generated in urban environments and spew it out into the countryside, where apparently it doesn't matter so much...

The egr cooler is designed to cool normal exhaust gas temperature but it's unlikely going to be able to reduce the highly raised EGT to the same level at regen. The regen process doesn't spew out soot as it's burnt so it 'spews' out the product of that combustion process and anyway emissions from diesel engines (particulates and NOX) are almost solely a problem in urban environments as far as air quality is concerned due to the traffic density and proximity to more people so you are right it doesn't matter so much in the countryside. 2012 TDV8 Vogue (L322)

This explains quite a bit
https://dieselnet.com/tech/dpf_regen.php 2012 TDV8 Vogue (L322)

Hahaha, that doesn't explain anything, it's a theory from 1983 and a patent of some snake-oil from 2011 - neither of which are in current use.
I'm bored of you now, no further responses from me, be happy in your delusions!

.[/quote]
That's the first time I've heard a claim that ash can be blown out of a DPF. One reason not to exercise the 2nd turbo is it adds to the ash load every time you use it ( if it's not had the drain mod).[/quote][/quote]

Too lazy to even google it? here is just 1 mention. https://www.crdperformance.com/dpf-introduction/dpf-regeneration/

The Regeneration Process
Regeneration is the term used to describe cleaning of the DPF. During this process the ‘wet and sooty’ particulate matter is subjected to further combustion inside the DPF itself. Surface temperatures inside the DPF can exceed 600 Degrees Celsius, at which point the soot turns into a hot white ash. Some of this ash is blown out of the exhaust whilst some is retained inside the core of the DPF. There are 3 methods diesel particulate filters can be regenerated: Passively, actively or forced.

[/b] 2018 SE SDV8 4.4 Byron Blue

Well I learned something new
Tried to not be lazy and did a quick search for myself but really there is not much out there repeating this and nothing that indicates any ash being blown out other than during the regeneration cycle when the ash is fine and has not started to form into larger particles ( it’s a fascinating subject)
BTW - that article also mentions some data (600deg C) not in current use  2012 TDV8 Vogue (L322)

Phoenix wrote:

Hahaha, that doesn't explain anything, it's a theory from 1983 and a patent of some snake-oil from 2011 - neither of which are in current use.
I'm bored of you now, no further responses from me, be happy in your delusions!

"I just hope you never sell your car as some poor sod is going to have bought a real moneypit."

My thoughts exactly !

JayGee wrote:

BTW - that article also mentions some data (600deg C) not in current use

But it clearly says 600C in your article as well!!  2018 SE SDV8 4.4 Byron Blue

Yes 600 deg c is the temp you need to burn carbon cleanly as referenced by many articles. My comment you are quoting was in reference to Phoenix who seems to think it’s out dated or snake oil ( hint - the meaning is in th that followed)
Nice try  2012 TDV8 Vogue (L322)

SamThomas wrote:

"I just hope you never sell your car as some poor sod is going to have bought a real moneypit."

My thoughts exactly !

Your thoughts being that driving gently to not stress the drivetrain on a 150k mile car is bad ? Or is it the more frequent oil changes? Or avoiding short urban trips and only putting on motorway miles ? - or have I missed something?  2012 TDV8 Vogue (L322)

Can you wait for a while?

Need to get some more popcorn

Surely the parts of the drivetrain are designed for such use. If they break then mend them.
It's like telling Usain Bolt to walk everywhere.

And if I wanted to prolong it's life and not have to spend money on or worry about replacing drivetrain parts ? Also the L322 feels just right wafting gently along. I'm not talking about driving like a slow road nuisance either as it gets up to speed very briskly without needing the 2nd turbo. Surly this is the very essence of the L322 - effortlessness progress in any situation  2012 TDV8 Vogue (L322)