|
S80 '06-'16 / V70 & XC70 '07-'16 General Forum for the P3-platform S80 and 70-series models |
Information |
|
DpfViews : 1348 Replies : 15Users Viewing This Thread : |
|
Thread Tools | Display Modes |
Dec 5th, 2019, 13:41 | #1 |
New Member
Last Online: Dec 11th, 2019 18:03
Join Date: Dec 2019
Location: WARLINGHAM
|
Dpf
I bought a 58 plated V70 estate back in January & at the same time as MOT became due this month I got a "book maintenance" message so got my local small friendly garage to do both. During discussions about the car in general my local mechanic suggested that I should take it for a blast at high speed once a week to get temp up such that dpf will regenerate. This seems to agree in general with the handbook, but mechanic also advised that I should run fuel down to warning light before I re-fuel as this will help with dpf regeneration. The handbook maked no mention of this. Has anyone else heard of this strange idea? (I normally re-fuel at quarter tank).
|
Dec 5th, 2019, 14:20 | #2 | |
Me ? Surely Not!
Last Online: Today 10:04
Join Date: Jul 2010
Location: 2007 Volvo XC90 D5 Geartronic. South of Hadrians Wall.
|
Quote:
Doing a long enough journey every now and again ( high speed has nothing to do with it )certainly will though as it will allow the DPF to carry out the regen successfully if required.
__________________
“Do the right thing. It will gratify some people and astonish the rest.” – Mark Twain 😊 2007 Volvo XC90 D5 SE Geartronic Last edited by S60D5-185; Dec 5th, 2019 at 14:22. |
|
The Following 2 Users Say Thank You to S60D5-185 For This Useful Post: |
Dec 5th, 2019, 14:32 | #3 |
Bungling Amateur
Last Online: Today 17:51
Join Date: Aug 2014
Location: Beverley, East Yorks
|
There's either diesel getting to the engine or not.... that theory makes no sense whatsoever.
__________________
2011 XC90 D5 Executive 2003 C70 T5 GT 2012 Ford Ranger XL SC 1977 Triumph Spitfire 1500 1976 Massey Ferguson 135 |
The Following User Says Thank You to Tannaton For This Useful Post: |
Dec 5th, 2019, 16:02 | #4 |
Premier Member
|
That mechanic seems to know nothing about regeneration.
It doesn't help driving the car fast once a week. Regeneration works better if you drive fast, but it doesn't start unless it's considered necessary by the car. Thus driving fast now and then of course increases the probability that regeneration is needed when you actually drive fast, but it could just as well be that driving fast fills the filter quicker, and the car then, at some less suitable time, finds it necessary to clean the filter. One could imagine that regeneration doesn't start if the fuel level is very low. Just like the engine heater doesn't run if you are low on fuel. The latter is true, but the first I don't know about. Anyway, it's at least the opposite of what the mechanic said, i.e. that having a full tank increases the probability that regeneration occurs when actually needed. |
The Following 2 Users Say Thank You to apersson850 For This Useful Post: |
Dec 5th, 2019, 16:44 | #5 | |
New Member
Last Online: Dec 11th, 2019 18:03
Join Date: Dec 2019
Location: WARLINGHAM
|
Quote:
|
|
Dec 5th, 2019, 21:39 | #6 |
Premier Member
Last Online: Today 10:50
Join Date: Nov 2015
Location: Poole
|
The regeneration process requires the car to be travelling at a constant speed in the mid range and for the engine to have reached its standard operating temperature. If the DPF has filled with soot, the back pressure sensor will register and trigger the regeneration. High speed is not required and while the regeneration would function at high speed, it would be more difficult to maintain a constant high speed than a constant mid range speed.
__________________
2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey |
Dec 6th, 2019, 09:44 | #7 |
Premier Member
|
No, it does not at all require the car to travel with constant speed. But a higher engine load in general is beneficiary, since then the exhaust from the engine into the DPF is warmer, and that improves the soot incineration.
Going slowly, stopping with the engine idling - that's the worst condition. But going up and down in speed, from midrange to high, is no problem at all. On the contrary, it probably involves higher load during acceleration, and that accelerates (!) the cleaning process. Towing a caravan improves filter cleaning quite a lot. But it also fills the filter faster, so there's probably no net gain. If the engine coolant hasn't reached normal temperature, around 88°C, the cleaning process doesn't start at all. In cars where you can't see in the display that regeneration is active, the most obvious sign is that consumption doesn't display 0.0 l/100 km when you are coasting. |
Dec 6th, 2019, 11:14 | #8 | |
Upstanding Member
Last Online: Sep 12th, 2023 12:29
Join Date: Mar 2018
Location: Ludlow
|
Quote:
There's an issue of condensation forming at less than a quarter full though.
__________________
GONE: 2015 V60 D4 181 (VEA) R-Design Lux Nav manual in black |
|
Dec 6th, 2019, 13:59 | #9 |
Premier Member
|
There's always an issue of condensation in the part of the tank where there's no fuel. It doesn't start when it's a quarter full, it starts when it's not full. But it gets worse and worse, the less fuel you have in the tank.
|
Dec 6th, 2019, 22:57 | #10 |
Master Member
Last Online: Dec 15th, 2023 19:46
Join Date: Jan 2006
Location: Kent,pothole capital of UK.
|
I ran my 2007/8 V70 D5 for years and always used two stroke oil in the fuel and never had any problems with DPF regeneration inspite of doing a lot of short runs . Regeneration is only noticeable by a Hot smell when you get out of the car but never even noticed that as two stroke raises the temp of the exhaust gas and burns the particles . I now use it in the fuel of my Jaguar for the past 3 1/2 years without problem . If you do try it use s goo quality ordinary mineral based low ashself mix oil at 200: 1 ratio about 300ml to a tank. I use Carlube two stroke available from Morrisons . You will notice engine runs quieter , smoother and picks up a bit quicker .
__________________
The secret of flight is to aim at the ground and miss ! Previous Volvos 740 GLE . V40 CD ,V70 2.4 SE LPT.V70 D5 P2. V70 D5 Se Lux P3. Current Jaguar XF Sportbrake but still like Volvos |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |
Display Modes | |
|
|