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DPF What is it?


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#21 F6HAD

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Posted 08 November 2010 - 11:06 PM

DPF technology is not new, and the Germans have been fitting them for the last 5 years now..

the issues occur when drivers either do mainly short start/stop journeys or are just not getting it up to the regen engine speeds..

A lot of people are now removing the DPF and having DPF Delete's carried out in the ECU maps, I've done quite a few myself now on VAG cars.
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#22 Dan Robinson

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Posted 08 November 2010 - 11:22 PM

But surely you are just pumping the same carp out over a wider area - ultimately the environment is still going to be affected?
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#23 Dan Robinson

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Posted 08 November 2010 - 11:33 PM

An easily removed cartridge would make much more sense - you could even have different capacities based on mileage and it doesn't have to be a difficult job to do either. Simple flange connection and a reset sequence in the cockpit.

Too complicated some of this eco-warrior stuff and for very little real benefit.
<!-- isHtml:1 --><!-- isHtml:1 --><p class='bbc_center'>06 (facelift) Tourer EX Graphite w/ Pentas, Stage 1 Remap by <a class='bbc_url' href='http://www.premiertuning.com/'>Premier Tuning</a>. Nice. With a genuine fake real spoiler. Factory fit. Probably the best spoiler ever. A-Spec suspension - makes the world a better place.</p><p class='bbc_center'><br /><img src='http://lh5.ggpht.com...8 - shopped.jpg' alt='Posted Image' class='bbc_img' /><br />It's a constant race between making things idiot-proof, and the universe making better idiots.<br /><br /><span style='font-size: 10px;'><a class='bbc_url' href='http://typeaccord.co.uk/forum/topic/4073-ta-shirts/page__st__160'><span style='color: #FF0000'>Get your TA Shirts here. While stocks last.</span></a></span></p>

#24 JSW

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Posted 09 November 2010 - 07:48 AM

Thanks for the help. The car has beens serviced by Holdcrofts since new so I will give them a ring today and ask what needs doing.

#25 Ezhik

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Posted 09 November 2010 - 08:35 AM

Do you think it will just take time to get the diesel emissions down in a way that works? Petrol may be clean burning now in most countries, but it took the best part of a hundred years to get it that way, and don't forget the damage that leaded petrol caused is enormous. Unleaded petrol is mostly global now with leaded still available in a few countries, yet the price we've already paid for adding lead will take decades to undo.

#26 JSW

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Posted 09 November 2010 - 12:18 PM

Interestingly, before I could ring, another 10 mile journey at 50-60mph seems to have resolved the problem and the warning has gone. Took quite a bit longer trhan the 15mins stated in the handbook. I shall have a read of the new topic now posted.

#27 Dan Robinson

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Posted 09 November 2010 - 08:19 PM

Perhaps you need to be getting closer to 70 for longer periods? Is there any part of the system that needs replacing after x000's of miles I wonder?
<!-- isHtml:1 --><!-- isHtml:1 --><p class='bbc_center'>06 (facelift) Tourer EX Graphite w/ Pentas, Stage 1 Remap by <a class='bbc_url' href='http://www.premiertuning.com/'>Premier Tuning</a>. Nice. With a genuine fake real spoiler. Factory fit. Probably the best spoiler ever. A-Spec suspension - makes the world a better place.</p><p class='bbc_center'><br /><img src='http://lh5.ggpht.com...8 - shopped.jpg' alt='Posted Image' class='bbc_img' /><br />It's a constant race between making things idiot-proof, and the universe making better idiots.<br /><br /><span style='font-size: 10px;'><a class='bbc_url' href='http://typeaccord.co.uk/forum/topic/4073-ta-shirts/page__st__160'><span style='color: #FF0000'>Get your TA Shirts here. While stocks last.</span></a></span></p>

#28 Monks

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Posted 10 November 2010 - 02:39 PM

Interestingly, before I could ring, another 10 mile journey at 50-60mph seems to have resolved the problem and the warning has gone. Took quite a bit longer trhan the 15mins stated in the handbook. I shall have a read of the new topic now posted.


The last conversation I had with a Tech about the 8th gen regen issues informed me that the typical regen time is close to 25 mins especially if the car has had trouble getting upto sufficient temperature.

#29 tompoyntz

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Posted 11 November 2010 - 12:16 PM

A very interesting post CJ, thanks.
Can I confirm my understanding though? Light A means that the DPF will clear automatically, and light B means that a visit to the dealer is required? Is that correct?

#30 Fizz

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Posted 23 November 2010 - 10:31 PM

Look what popped up on my dashboard this afternoon.

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:D

#31 F6HAD

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Posted 23 November 2010 - 10:33 PM

Andy you been doing a lot of short start stops recently?
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#32 F6HAD

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Posted 23 November 2010 - 10:42 PM

Andy when your car was tuned did they not perform a DPF delete?
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#33 Fizz

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Posted 24 November 2010 - 07:16 AM

Andy you been doing a lot of short start stops recently?


I do a couple of ten mile journeys daily (school run), but the wife took the car to meadowhall on Monday so that was 40 miles each way. I also do a few 100 mile each way journeys for work during the week, but I keep it to about 60 on the motorway.

#34 Fizz

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Posted 24 November 2010 - 11:47 AM

Andy when your car was tuned did they not perform a DPF delete?



The guy didn't mention a DPF delete so I assume he didn't do it. I'm not sure if I want it removing, won't the DPF get clogged up without you getting a warning when it is deleted?

Edited by Fizz, 24 November 2010 - 11:50 AM.


#35 Fizz

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Posted 24 November 2010 - 11:49 AM

Andy went to the renowned useless Honda dealer in Leeds for a DPF reset .. they said it will take them a full one day to fix it ..

HH did the same fix at our meet within 20 minutes.. cant Honda see this dealer in Leeds is not fit for purpose they are complete and utter joke.



Hey you beat me to it. :(

I've got it booked in for a service at Holdcroft on Monday so I'll keep it off the road until then.

#36 F6HAD

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Posted 25 November 2010 - 11:02 AM

The guy didn't mention a DPF delete so I assume he didn't do it. I'm not sure if I want it removing, won't the DPF get clogged up without you getting a warning when it is deleted?


Andy, not if done properly. We would effectively delete the Regeneration Strategy and remove the fault code altogether. This can only be done on an empty or fault free DPF however.. if the light is already on, you need to have it cleared, take it for a run and let it complete the regen and then have the DPF delete carried out.

Not entirely sure why your tuner didn't do this, but this is regular business..

Do bear in mind that physically the DPF will still be there, and you still can't tune the car as hard - but if you were to have the DPF removed and install a bypass pipe, there's probably another safe 10-15bhp to be had :(
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#37 Dan Robinson

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Posted 25 November 2010 - 11:38 PM

Long live the i-CDTI..

a lot of hassle to spread soot over a bigger area....;)
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#38 Blue Guru

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Posted 30 November 2010 - 11:00 AM

i heard some dude with a 530d had his dpf removed and set fire to so it would effectively clean itself, lol! He wasnt up for paying £600 for a new one. Only head this recently as my cousin phoned me up saying he's having problems with his lexi is220d (2006-60k) and its gone into limp mode. He took it to a local garage and they diagnosed it as the DPF, so he had it hooked up to some machine which apparently regenerates the filter by setting the idle limit at different rpm's for a certain amount of time. He said his car seems to be fine now.... But its annoyed him so much in regards to modern diesels he's thinkin of goin for a big petrol engine as he doesnt do enough milage anyway :)

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#39 F6HAD

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Posted 30 November 2010 - 01:49 PM

The problem with that Oz is that he didn't want to pay and have it removed properly. I tuned an A4 for someone recently who did the same thing. He thought he'd try and save some money and paid a local garage £40 to 'knock' his DPF through.

They did that alright and destroyed his Exhaust Gas Temp sensor in the process and left loads of crud in the system (DPF and Cat are combined in the Audi).. anyways, long story short it cost him more to rectify the problem than it would to have a proper DPF bypass installed (which is what I advised him in the first place) :rolleyes:

I do agree though, DPF cars are best avoided... but ultimately if you want to buy a modern diesel, you won't have a choice.
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#40 Fizz

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Posted 30 November 2010 - 01:51 PM

My car is now sorted. It took Holdcroft just under three hours to do a 37500 mile service, regen the DPF, regas the air conditioning and replace two rear speakers.

Not bad when s****estone wanted the car all day to do just the DPF????