Golf IV TDI: DPF as an auxiliary system without cat replacement?

Hello everyone,

Unfortunately, I cannot avoid having to install a diesel particulate filter, as since January 1, 2013, no vehicles with a yellow environmental sticker are allowed to enter the workplace of my wife.

I have already done some research online regarding particulate filters. It seems that there are combined systems (catalytic converter + DPF in one component) and additional systems from the company Twintec. However, the following criteria must be met when using auxiliary systems: Kilometer reading less than 80,000 km or not older than 5 years.

I intend to purchase an additional system, however, my vehicle still has the original first-generation catalytic converter (12 years old) and it has 233,000 km on the odometer. Since I don't know how long the vehicle will last, I want to keep the cost of obtaining a green environmental sticker as low as possible - therefore, installing a Twintec auxiliary system is a good option (parts price of 270 euros online).

Yesterday, I went for my vehicle inspection (HU/AU) and during that process, I asked the inspector a few questions. It seems that there is no way to re-classify the emissions class or something similar to obtain the green sticker. And if you install the DPF yourself, instead of at a workshop, you can probably have it registered during the inspection, without having to undergo an emissions test or anything like that. It is likely that only a visual inspection will be carried out to check whether a DPF (Diesel Particulate Filter) has been installed or not.

Has anyone already had similar experiences with installing an aftermarket DPF with an "old" cat? Did this cause any problems when registering the vehicle in the official documents?

Thank you in advance for your responses/many tips/suggestions.

Greetings
-chip-

-chip- wrote:

Mileage under 80,000 km or less than 5 years.

It is, without a doubt, clear

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Yesterday, I went for my vehicle inspection (HU/AU) and during the inspection, I asked the inspector a few questions. It seems that there is no way to re-classify the emissions class or something similar to obtain the green sticker. And if you install the DPF yourself and not in a workshop, it seems that you can have it registered during the inspection without having to carry out an emissions test or anything like that. There will probably only be a visual inspection to see if a DPF has been installed or not.

Therefore, the inspector , as the installation in your case, including the cat and DPF, becomes a single unit after the change of the plate from yellow to green. Of course, you can install it yourself and have it inspected and registered by the TÜV. The only requirement in your case is that the Cat-DPF combination is suitable.

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Has anyone already had similar experiences with installing an aftermarket DPF with an "old" cat? Were there any problems later when registering the vehicle in the official documents?

This is clearly fraud

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That's clear fraud icon_rolleyes

And the plaque regulation – what is it

Also, the retrofit filters must also be able to remove the filtered particles.

Here, nitrogen dioxide (NO2) is used for the Russoxidation. However, this oxidant is only adequately produced in a properly functioning, upstream oxicat. Since these catalysts also do not last forever, the legislator has set a limit of 80,000 km or 5 years.

So, it also has technical backgrounds.

Why not set up a combined system and sell the old cat to one of these dealers, and that's it?

An additional AU (Certificate of Conformity) is not required for DPF (Diesel Particulate Filter) retrofitting.
I believe that February 15th is the deadline. You should probably Google that again, I'm not sure about that.
I mean that all applications that have been submitted up to this date will still be funded with €330. And those who apply later will pay 260 euros.

Can I also recommend..., I have written this somewhere before,

Costs for my Ibiza with ASV last year:

Cost Filter G+M 559 Euro, Auction House, Filter complete from Turbo with Flex Tube
Installation by Freund at the workshop, 20 euros.
DEKRA Acceptance 38,-- Euro,
Application Fee 11.30 Euro and the sticker 5,-- Euro

After deducting the €330 and €140 grants, and the cost of disposing of the old cat, the remaining costs were approximately €160.

The cat was well taken care of, the installation was completed in an hour.

Steffen W wrote:

I think that all applications that have been submitted up to this date will still be funded at €330.

Correct, but only if the installation date/invoice is before 01.01.2013.

I find it really interesting: the "old" cat can be a maximum of 80,000 km old.
But if a combined system is installed, then the cat (before the DPF) used in that system will also eventually exceed the 80,000 km limit, and then there won't be any more "crows" [referring to exhaust noise].

A mischievous person is often wrongly accused.

vwSchrauber wrote:

I find it really interesting: the "old" cat can be a maximum of 80,000 km old. But if a combined system is installed, then the cat (before the DPF) used in that system will also eventually exceed the 80,000 km limit, and then there won't be any more "crows" [referring to exhaust noise]. A mischievous person is always thinking of something bad.

I completely agree with that.
Therefore, this regulation is so pointless and illogical...

-chip- wrote:

Therefore, this regulation is so pointless and illogical...

It's so pointless for those who don't receive any money.

Steffen W wrote:

Why not set up a combined system and sell the old cat to one of these dealers, and that's it?

That's exactly how I see it too.

1 +

vwSchrauber wrote:

However, if a combined system is installed, then the cat (before the DPF) used in that system will also eventually exceed the 80,000 km limit, and then there won't be any more "clucking" afterwards.

If the upstream cat, when the DPF is installed, is replaced or not, eventually cannot produce enough of this oxide, then the DPF behind it cannot regenerate.
Depending on the model and version, it either has an integrated bypass and becomes ineffective or simply goes to sleep. Then it is essentially worn out and needs to be replaced.
That's exactly like with any other wear-and-tear part. It's over.
However, in order to ensure a certain lifespan of the system from the outset, the legislature has set a limit for older "Oxikats" regarding age and mileage.
That's actually not that difficult to understand.

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However, in order to ensure a certain lifespan of the system from the outset, the legislator has set a limit for older "Oxikats" regarding age and mileage. That's actually not that difficult to understand.

Naturally, this is a very optimistic outlook.


Is there really... Long-term studies on retrofit filters?

In metal nonwoven filters, the effectiveness is likely demonstrated in the following way:

Measure vehicle without DPF on a dynamometer.
DPF + new Oxicat filter.

Vehicle pushed onto the test stand, started, measured.


Due to the large internal surface area of the DPF and the new (=clean) oxygen sensor, there will logically be fewer soot particles exiting the exhaust at the subsequent measurement, as the system initially needs to be "wetted" with soot.

If we were to measure again 1000 km later, the values would certainly be very different.

vwSchrauber wrote:

Is there really... Long-term studies on retrofit filters? ... If we were to measure again 1000km later, the values would certainly be very different.

When it comes to me, as a user of Kombi filters, I would be more interested in a lifespan of >80,000 km after installation, rather than 1,000 km. On the corresponding webpage, I couldn't find anything related to "bypass" or "long-term effectiveness"...

If everything starts flowing smoothly shortly after installation, is this bypass then smaller or larger than the combined filter with <80 Tkm?

Does anyone know more?
haithamina

Boro wrote:

I can also recommend..., I have written about this somewhere before, Costs for my Ibiza with ASV last year: Cost Filter G+M 559 Euro, Auction House, Filter complete from Turbo with Flex Tube Installation by Freund at the workshop, 20 euros. DEKRA Acceptance 38,-- Euro, Application Fee 11.30 Euro and the sticker 5,-- Euro After deducting the €330 and €140 grants, and the cost of disposing of the old cat, the remaining costs were approximately €160. The cat was well taken care of, and the installation was completed in one hour.

Thank you, Boro, for the very helpful tip; I will probably follow your approach.
I have already inquired about combination systems with various vendors.
Can you tell me your cat's name? I'm probably also going to sell the old car (hopefully) at a good price so that this conversion doesn't create a big hole in the household budget

T3Surfer wrote:

That's exactly how I see it too. 1 +

Thank you very much!

Okay, I offered the cat as a spare part at the auction house and was then immediately contacted by several salvage companies/individuals. The best offer from the approximately ten pieces then won out, with prepayment followed by flawless shipping.

As mentioned, the achieved price for an 'ASV' category.