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Diesel Particulate Filter - Wish List

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Old Dec 15th, 2010, 23:06   #41
Farway
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That is something that went thru my mind a few times whilst stuck in the snow for several hours on end. Nearly all the cars around me would just sit idling with headlights on for several hours. That could not be conducive to reliable motoring but in the same sense, appreciate the need to keep warm when the mercury's around -7 mark. I have a 54 plate D5 with cat not dpf but the theory's the same. I regularly put it in neutral, and got the revs up to around 3000 + mark for 10 to 20 seconds or so. This just boosts the battery and pushes some serious heat thru the engine and clears out the crut. When traffic does not allow to exceed the 50mph mark, place the shift into 3rd or 2nd gear and again get the revs right up there for a min or so. You won't break it or do it any harm. I think its rubbish that dpf cars are so bloody temperamental and will certainly not get one for the missus.... There is the option to completely remove the dpf and replace it with a straight pipe. You would need to have to error code programmed out and there are some ecu re-map companies that specialise in this. You have 2 sensors that read the pressure differential (how blocked the filter is) and then decides to send a flash down to clean the unit. I would imagine you would have to have both sensors either free to air to read the same pressures or both connected into the exhaust pipe. The ecu will read the unit as constantly being clean and not need to clean it. You have an EGR valve (exhaust gas recycling) system that diverts exhaust gas back into the inlet manifold so you in essence have (as example) 90% fresh air and 10% recycled exhaust gas. This brings your CO emissions down to where they should be and you (as far as I know) cannot block this system on the new volvos like you could on the old transit vans. As long as your CO readings are ok, you will pass your mot.......
I will curiously wait to be corrected on this subject which no-doubt will be the case, but certainly the route I would take If I had to try and get reliability out of a car. (Then again, EU emissions require levels of CO to be lower that the EGR valve lone can manage I guess.)

Last edited by Farway; Dec 15th, 2010 at 23:29.
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Old Dec 15th, 2010, 23:18   #42
moncman
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Or you could stick in some 2 stroke oil to aid clean combustion and enhance some of the lubrication lost by ULSD. As well as less DPF probs you might get better mpg and better responce/more power/smoother running.

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Old Dec 15th, 2010, 23:22   #43
Farway
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Mmmmm, someone seems to also have been transfixed on the 2-stroke thread...
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Old Dec 15th, 2010, 23:32   #44
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Originally Posted by Farway View Post
Mmmmm, someone seems to also have been transfixed on the 2-stroke thread...
Not neccessarily transfixed but we had a Saab 9-3 that would routinely shut down to limp home mode as soon as you put supermarket fuel in it (yes really). The EGR would gum up on account of the very high pressures in the common rail causing the diesel to break down with the effect of appearing to run lean. More diesel was added by the ECU causing more soot and a EGR valve error. DPfs can also be problematic with urban journeys (lots of posts to substanciate my claim) and so I believe we are getting to the point that legislation (euro 5 etc) is outstripping basic diesel technology.
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Old Sep 18th, 2011, 21:49   #45
r v lewis
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when regeneration is taking place I gather that the heated rear window is activated to increase engine load and hence exhaust temperature. Presumably it would be relatively easy to wire a small LED across the power supply to the heated window as an indication of regeneration ?
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Old Feb 7th, 2013, 09:46   #46
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when regeneration is taking place I gather that the heated rear window is activated to increase engine load and hence exhaust temperature. Presumably it would be relatively easy to wire a small LED across the power supply to the heated window as an indication of regeneration ?
A very good idea. As long as the LED is on you'd know regeneration is still in progress - perhaps tempting you to drive a bit further to allow the cycle to complete - if you were about to switch off.
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Old Feb 8th, 2013, 13:41   #47
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Got the dreaded "Soot particle filter full" message again yesterday. Had a good look at the rear screen heating controls and there is no indication on the dash that it is on at all. Perhaps engine management is able to switch it on without lighting the LED in the button. I'm going to connect directly to the heating element. For the benefit of anyone else wanting to try this, remember to use a 1K resistor in series with the LED, otherwise you'll fry the LED. Also, the LED is a "polarised" device. If you get it the wrong way round it won't light, so test your circuit on the car battery first to make sure you've got the polarity right. The advantage of using a LED is it will draw very little current and won't generate any heat. You can also use a small conventional bulb if you don't have a LED or resistor. By small, i mean something the size of a couple of match heads, the kind they use to light up displays in car radios etc. This would get hot but not hot enough to burn you or whatever it's lying on.

A last word of caution. The 12v supply to your rear screen heater will be able to deliver a fair bit of current. Take great care not to let the wires you attach to it short together.
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Old Oct 25th, 2015, 01:48   #48
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Originally Posted by chunderground View Post
nothing subversive or hidden agendas on my part just a new xc90 owner who loves his car and looking for solutions. Wikipedia entry on one of the low soot fuels below :-


V-Power Diesel



An Audi R10 TDI LMP race car, fueled on Shell V-Power Diesel
V-Power Diesel is Shell's version of an enhanced diesel fuel, similar, say to BPs 'Ultimate Diesel'. Like BP Ultimate Diesel, Shell V-Power Diesel is designed for modern compression-ignition diesel engines, to facilitate enhanced engine performance along with increased engine protection, for more consistent operation and engine longevity.[3]
V-Power Diesel is a blend of regular petroleum-based diesel and synthetic diesel, created using gas to liquids (GTL), along with some extra additives designed to clean the injection system and improve injection pump and injector lubricity.
One characteristic of V-Power diesel is that it is a lot clearer and odourless than normal diesel, mainly due to the synthetic GTL component.
The fuel is slightly less dense than regular diesel so, per volume, the unit energy is actually lower than regular diesel. This is offset, as the fuel tends to ignite more readily (and thus has a higher cetane rating) than regular diesel, and a side benefit of this is that it tends to produce less soot during combustion.



Please note the last line. If a cleaner burning fuel is used thats less soot to block the DPF, not rocket science is it ?
I agree that I have posted an incorrect post on bio fuel levels in diesel but I did correct this immediately I learnt of my mistake. I am on a learning curve with this problem like the rest of us. I am following this line of thinking because I really think it has a possible benefit to all us unfortunate DPF owners. All readers in the volvo community can make their own judgements.
Sorry to hi jack at this late stage but I have something I wish to share
1. My mate works for Shell research and does not use v power as its a marketing ploy
2. Another mate is a petrol tanker driver and collects for many of the big fuel companies. All the petrol comes from one of a very few refineries that are left and the bigger companies add a double shot of detergent compared to your supermarkets and makes very little difference!
People who use v power and ultimate are wasting their money, sorry people
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Old Oct 25th, 2015, 01:29   #49
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Thanks for your post Drgoodlove. Isn't it shocking that petrochemical folk would ever think of ripping off the public ( immediately Formula Shell springs to mind).
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Old Oct 25th, 2015, 10:51   #50
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Not read the whole thread so unsure if this has been mentioned.
I leave my infotainment display on my car (my15 V40 D4 VEA) in the display it shows me if start stop is active, when I start the car from cold obviously it is not active once warm it becomes available, I keep an eye on this during my journey occasionally usually once every 2 tanks or roughly 800-1000 miles it will grey out and become unavailable this is how I assume my dpf is regenerating. During this time I ensure I do not stop the engine until it becomes available again.

Premium fuels, probably a waste of money, I notice in the manual it only states to use quality fuels without special additives. I have done many tests myself on fills and runs using both premium fuels and standard fuels and have noticed no difference in performance or economy. Yet I still put premium grade in, it costs me maybe £50-100 more a year to tank up with premium fuels, placebos make me feel better.
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