Just been quoted 5000 euro to replace particular filter

 

Get it professionally cleaned with power back flushing. It will be as good as new then.

I cleaned mine myself, disconnected the DPF from turbo, blanked the opening off, removed top sensor from DPF, poured in DPF cleaner, left for an hour or 2, then poured 7 litres of boiling water in, which dissappeared and didn't come out of the tail pipes! Did get a bit worried, but it can't go anywhere else!

My 3.0tdi had back box delete, so straight through pipes, basically the DPF was the only 'silencer' in the exhaust!

Started her up and 2 big gushes of water flew out of the exhausts. You could see grey ash in the tail pipe and on the floor, so I knew I had gone some way to getting rid of the ash content!

The DPF collects soot which is the black smoke you get on some non DPF vehicles. Then when it gets to a point where the soot is causing back pressure, it does a regen and burns the soot off, BUT, as with most burning of substances/particles, not all of it is burnt off completely, so now you have ash in the DPF. This is what builds up and cause problems on high mileage cars and then the garage says you need a new one. but flushing does a good job and gives the DPF more life.

If your DPF keeps regenerating, there are other factors that cause DPF blockages/regens, like broken or blocked EGRs, EGR coolers, intake flaps, low quality fuel.

 

Dpf filters are shite they are only made so your car eventually builds up enough soot and goes bang resulting in either main dealers getting stacks of cash for repairs or you buying a new car, get that thing ripped out and let your engine breathe, as for all the people saying about mots and what not fines and being locked up would never happen they would just refuse the test and thats it nothing serious is going to happen

 

I am only been a owner of Audi few months but seen it discussed many time on my previous car BMW forums.

There are many people that would happily gut the DPF without any care in the world and visit their mates garage for MOT. Also when they sell the car they hide this fact from next unsuspecting owner.

But if you ever involved in a major accident and the car needs to be inspected by insurance..the policy is not worth the paper its written on and its time behind bars.

 

I will add my comments as I have had a 3.0tdi with dpf, then gutted dpf ,then full delete pipe in the last 12 months.
If you are staying stage 1 then dpf delete pipe is not necessary as the only real benefit is it will make more noise if you have a straight through exhaust.
Gutting the dpf allows the turbo to spool quicker but you need a good mot station and you don't get mega gains.
Leaving the dpf on still gives good power/torque gains,and the car is quiet.
For all those who have mentioned that the car chucks out smoke when the dpf is gutted check this out
3.0 tdi dpf gutted straight through exhaust:
No smoke

Audi 3.0 tdi

 

Hiya guys!! My 10 pence worth, I am always undecided between "go my own way until they catch me" and "mmm lets look after the earth a bit". In this context I think that I vote to not remove the DPF from a diesel vehicle cos I hate the smoke from an exhaust. And I also think that they don't really make much difference apart from a slight weight increase, so why spend money and then get caught at the MOT station (potentially).

 

Removing or modifying a car where a DPF was originally installed will result in a major fail at an MOT after 20th May. There will be a maximum fine of £1000 and you will not be allowed to drive the car on the road, not even from the MOT station, until the major fail has been rectified. If the MOT station is not able to make the repair then you will have to arrange for a car transporter to take the car to an alternative garage.

Another consideration is that removing the DPF makes the car unroadworthy and will invalidate your cars insurance.

I personally dont like DPF's anyless than anyone else but the rules are there for a reason whether you agree with them or not. Modify your cars but please keep within the law.

 

Another consideration is that removing the DPF makes the car unroadworthy and will invalidate your cars insurance.

That depends entirely on the terms of the individual policy and whether or not the modification is declared and accepted or the insurer's attitude to undeclared modifications on the policy. Insurance policies do not automatically become invalidated due to modifications (whether declared or undeclared). It comes down to the terms of the individual insurance contract that has been agreed - i.e the terms and conditions.

For the record I hate seeing cars with DPF's removed. Nothing worse than seeing big puffs of black soot coming at you from the car in front.

 

Hi, yes it passed , 20 mins and the test center guy said it was a beautiful car �� everyone has there own option, but for me ,, stage one and two gains and sound of of my car is well worth it (remember it can always be put back if I am every selling it .. it’s not a big job

 

Hi, yes it passed , 20 mins and the test center guy said it was a beautiful car everyone has there own option, but for me ,, stage one and two gains and sound of of my car is well worth it (remember it can always be put back if I am every selling it .. it’s not a big job

Glad to hear that mate! It's all about enjoying what you've got! You're right about the stage 1 and 2, 100% worth it. I just sold mine and on the hunt for an S5 now, no doubt the first MOD would be a straight-pipe [emoji23]


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If the DPF is working fine, leave it there, unless you want a loud exhaust or looking for big power with custom turbos etc.

As said the DPF MoT check will be more in-depth than just looking for the presence of the 'empty' DPF.

I got 310bhp with DPF still in place. Some people have the same figure with DPF removed, so in my opinion it makes no performance difference. It's just when you start to seriously up the power that the DPF hinders. Even then it's more to do with the exhaust gas temps than restrictiveness.

Diesel is a dirty fuel so to protect the environment, it's better to leave. The only emissions bugbear I have is the EGR, but you have to have it for the DPF to function properly.

 

Can we not just modify our cars within the law? The rules on DPFs are there for a very good reason.

 

Yeah I’d agree. I found it surprising how many tuners offered this as a fairly basic thing, like an everyday upgrade. I was fairly sure that they had to sell it as a not-for-public-roads upgrade.

 

Removing the guts of the DPF will still result in an MOT fail. Part of the MOT inspection from 20th May is to look for any smoke emitting from the exhaust of a car fitted with a DPF, any smoke and its a fail.

 

I have had remapping, dpf removed! Replace with a false dpf,,Muffler removed full tint ( I have my mot tomorrow so let’s see if they can spot it ( I got the front tints taken off to day will replace them next weekend

 

Unfortunately I can't send videos even direct, but if you want send me your email that should be fine!


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I can't upload any videos on here :/ I will try to PM you the video buddy


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Very much a vote for leaving the DPF alone. It's partly folks that remove them that cause much of the disdain towards diesel.

 

I had my 2.7 TDI done a few months back, had the 2 mufflers delete, DPF delete and stage 2 remapped, and fully tinted windows (legal 20% driver and passenger, the rest limo),

At a local garage had the stage 2 remapped and DPF delete and 2 muffler delete and officially quoted around £850 if I'm not wrong, negotiated it down to £700.. bargain? I don't know, but it was worth it imo, for a diesels, it sounds great and it's running around 260 bhp (not dyno proved) im guessing with the weight loss of the back boxes and DPF maybe it's 270 bhp? Anyhow, they didn't remove the whole DFP only the inside so it passes MOT.

Pros:
sounds great! Especially in a cold start[emoji7] it really does sound like a straight piped S5 IMO, (I'll upload a video as I haven't started the car up yet since I've woken up, so it's a good opportunity for anyone to see)

Cons:
ONLY in cold start (in the morning usually it happens once you leave it overnight) when you start the car up there will be some blue-ish white smoke only for a few seconds and then it goes all away, because we've removed the inside of the DPF so it makes sense. Nothing to be worried about, and when you floor it, it doesn't produce any smoke

Tip:
If you have the Multitronic gearbox, in a straight line put the car in SPORT and my god it does sound like the valves are open[emoji7] just roars. And I must say the power It went from a stock 190bhp to 250+bhp just pulls like a train!

Mods on my 2.7 TDI Sport:

Fully tinted windows all around
DPF delete
Mufflers delete
Stage 2 remap
Spacers for the rear tyres (25mm)

And I will post the video of the cold start In a few minutes! Goodluck! [emoji1360]

Here's some pictures of her

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For value I suspect the low 200 for getting it done is fairly good personally. However I concur with Blue above that IMO I don't think it's worth the hassle with regards to legality and MOT. You will end up worse off in the future if you fail your MOT, have to pay a fine and a mechanic to fit it again AND a remap to get it to work in the car after.

There will be a large sound difference and a minor performance difference for a car without a DPF but in your case, unless you want to go crazy with performance mods I would suggest keeping it in place and accept the power you will get with it in place.

You can always get a more powerful car in the future if that is what you are after.

Regards

 

You’re not going to see as much improvement from the dpf as you will from the remap itself. In terms of hp for £, it won’t be close.

You’ll still get a monster with a remapped s5, but considering it’s almost twice the price, I’d say it’s harder to justify. Unless the dpf is clogged up, in which case it would make more difference.

Also (FYI - not an expert on this) I think it depends how they do the dpf delete. If they simply remove it completely - I believe that’s supposed to be an MOT fail. If it’s still there visually but essentially hollowed out, you should get away with it. I’d personally be hesitant to do a dpf delete in case MOT procedure changed in the nearish future, making it more definitively a failure and being caught out, or having to put it back. But then a lot of people on here seem to have done it without issue.

Hope that’s helps?

Who is doing the dyno remap for you out of interest?