Member Since: 11 May 2006
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DPF regen, questions?
I don't want this to divert from the diesel diluting oil thread but, as DPF is new(ish) to me, questions.
What speed do I have to drive at to guarantee "forced" DPF regeneration? I've seen 2,500 revs mentioned, that would be about 90mph in 6th, 80 odd in 5th or 70 in 4thin a six speeder.
No way am I risking my license at 90 so even at 70, how long do I need to hold 4th? 20 minutes?
Isn't the DPF meant to automatically regenerate? Would a 20 mile blast up to 70 - 75mph at the end of a 550 mile haul mean it's regenerated at the end of said blast?
I've had the car for 12k miles, I'm assuming it has regenerated several times, how often would it do it on a long haul at my normal long haul cruising speed, 60mph? I can't remember noticing it regerating, it must be subtle if it does.
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11th Aug 2017 3:24 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73082
Cheers, lots of techie stuff to read.
11th Aug 2017 3:28 pm
robpenrose
Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2138
I would make sure your secondary turbo is getting a regular work out too
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11th Aug 2017 3:30 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73082
Will give that a little rooster booster next time out. There are some pretty steep hills around here where I can get a bit of speed up.
Last edited by DSL on 11th Aug 2017 3:32 pm. Edited 1 time in total
Never seen it happen on either of my D4s but on SWMBOs Antara it's a pain.
You start to get warnings at 3rd fail IIRC and fix was take it for a run, manually select 3rd gear and rag it,er, just under national speed limit for 15 to 20 minutes. However, since part of under engine cover was removed due to technical issues ( exploding when hot ) the airflow at that kind of speed prevents it getting hot enough to do the regen. So ... Mad as it seems, slow down a bit and it works. Think enjoyable country lane instead of motorway 😀.
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
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11th Aug 2017 3:32 pm
First Soldier
Member Since: 16 Oct 2022
Location: TR
Posts: 3
If you look at this topic, I have written my experience with speed and rpm for DPF regen on road.
The easy way is to select low gear and boot it down the motorway for a about 10 miles or so, no need to break the speed limit. done a few this way before the IID tool got the re-gen option.
Flack
6th Jan 2023 1:13 pm
SN
Member Since: 03 Jan 2006
Location: Romiley
Posts: 13710
What vehicle you driving these days Derek?
It was a pain on my Isuzu, definitely more clattery when it was regening - which it insisted on doing every 100 or so miles.
Can't say I've ever noticed anything on the New Defender...Steve N | 21MY Defender | 08MY Discovery 3 (history) | 06MY Discovery 3 (ancient history)
6th Jan 2023 1:28 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73082
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... All LED interiors lights, DRLs, Spare Wheel protector.
