Just wondering how many miles are average between regens on a tdv6. Mine is doing about 200 and regens when soot concentration is about 20 and maximum soot load inferred percent is around 50. Must admit I'm not sure what the latter is telling me. Is it a calculation of the soot level in the DPF? Are these figures roughly what others are seeing?
Cheers.
Pete

Hi Pete,

Yes, your findings are about the same as mine, and you are right, its an estimated calculation that your DPF is 1/2 full.

You will find the car is ready for a regen after 200 miles and approaching 50% soot, and if warmed up etc with enough fuel in the tank, will regen almost as soon as you floor the throttle up a motorway slip lane. If that is delayed, mine will go straight into regen at 60%, not warmed up or anything! Needless to say, that could be on a very short journey! That happened to me, and although I did try to rescue the situation by going straight to the m’way, it lopped 50 miles off the AMTR value.

I’ve not bettered the 200 mile figure due to many short/few long journeys. “If it ain’t broke, don’t fix it” -where’s the fun in that?

Silly question - how do you know when it's doing a regen?

Chris. L405 - 4.4SDV8 Vogue
P38 - 4.6V8 HSE
Land Rover series IIA V8

We use the kit talked about here: https://www.fullfatrr.com/forum/topic60839.html
It is the best way to see what is going on. SDV8 AB MY 2020
MINI Cooper S Cabrio
Kit: Jaguar XK140 (in progress - the website is link to build)

When mines doing a regen, the instantaneous fuel economy goes to ratshit, seems to be about once a week, 200 ish miles.

@Goldeneye32,

Yes, you’re right, but then it’s already happening and in control of “when & where”, e.g. in the city centre, or stuck in heavy traffic, with almost no chance of successful completion.
So much better if you can monitor the situation, so YOU can be in control of when & where, to prevent failed regens, minimise oil dilution, minimise engine wear, and maximise “miles to service”.  “If it ain’t broke, don’t fix it” -where’s the fun in that?

As luck would have it, I live right next to an A303 junction which I use daily, so my car gets a 33 mile dual carriageway and motorway mix, but what i don't know is what the journeys were like before I owned the car, but as it has over 100K on it now (average mileage) I reckon it's had it's fair share of reasonable journeys.
I'm mindful of it now, but maybe the previous owner wasn't, the point I am trying to make is if you know there is a potential issue, then you can try and mitigate it, for warned is for armed and all that.
I must admit that I wasn't aware that during the regen process, excess unburnt diesel is dumped into the sump, which is why the oil viscosity is diluted, nice one JLR!

@Goldeneye32:
“ I must admit that I wasn't aware that during the regen process, excess unburnt diesel is dumped into the sump, which is why the oil viscosity is diluted, nice one JLR!”

I’m not 100% sure you’ve quite grasped what really happens during regen, there’s lots of reading on here if you want to, Kot has been very helpful with articles, etc.

It’s not so much regens to be feared, in fact they need to happen; -it’s multiple FAILED regens.

Granted JLR have a lot to answer for  “If it ain’t broke, don’t fix it” -where’s the fun in that?

So I get a regen about every 200 miles which seems to be about the norm for the V6. I wonder why it is then that my mate who has a Jag XF V6 averages 2300 miles? Same engine surely.

Click image to enlarge

Hi Spridget,

Yes, same engine, but different Architecture i.e. the DPF is further downstream from the engine in a fullfat, resulting in cooler exhaust temperatures which frustrate the passive regen process, thus requiring diesel-fuelled “Active” regens much more frequently.  “If it ain’t broke, don’t fix it” -where’s the fun in that?

Back again with more questions. My regens have been pretty regular, starting when the soot is 51% and about 20grams. Usually about every 140 miles. Yesterday on a long drive south the soot % went up to 70 and about 23 grams. I had to stop at road works and when I started up again it went straight into a regen. I got 245 miles since last regen but what initiates it? Great that the distance from last regen has increased with a long run but why did it not regen at the normal parameters? Maybe it's looking at something that I can't see. Any theories most welcome.
Pete