Restriction, what restriction! DPF, say no more

[orsegtsport]

the dpf doesnt use a catalyst and is a non-servicable item...

talking of clean cars.... the dpf catches soot particles...

the soot from diesel engines is not bad stuff, its basically dirt. if falls on to the ground, then washes away or gets picked up and sticks to your car when its wet. it doesnt contribute anything to smog as much as many other things such as sulphur. diesel soot particles are so big that they litterally fall out of the air...

the DPF is a sales technique. diesel soot is an easy target to pick on for emissions, because its visible. doesnt mean its bad.

i'm more worried about petrol engine exhaust myself....

has anyone noticed lately that behind each and every toyota kluger there is a foul smelling cloud of sulphur dioxide? next time you smell something aweful in traffic, i'll bet there is a toyota kluger infront of you.

all petrol 4wd's should be BANNED! NO, BLOWN UP!!!

Where did this information come from? My understating is that most DPF systems employ a catalyst component that oxidizes the particulate matter, and that the more efficient systems are capable of reducing PM by about 90%. In addition, some DPF’s can remove almost 90% of Hydrocarbons and Carbon Monoxide, which, is a very nasty pollutant (more abundant in petrol exhaust gases), that binds to the blood stream in place of where oxygen normally would, and can have nasty implications.

Particulates are not simply harmless soot that will fall to the ground either. They are a major component of airborne pollution, and several studies have concluded that there is a very high probability that they are both carcinogenic and cause respiratory problems. Diesels also produce more Nitrogen Oxides than petrol engines, but some studies suggest that this improves over the life of the engine to the point where diesels actually produce less NOx than their petrol counterparts.

Frankly, I’m surprised at all the negativity people seem to be displaying towards this great piece of technology. For me, the DPF was the reason I ultimately bought the car. I was after a car with good performance and relatively low CO2 emissions, but didn’t want to be belching out a heap of other nasties, so Diesels were initially off my shopping list. However, when I heard that the GT Sport was fitted with a DPF all that changed. Yes, I’m a tree hugger, and I don’t expect that the DPF will be a significant selling point for everyone, but considerably reducing pollution of any kind has to be a good thing, surely?

As Mishca has discovered, they are still yet to be perfected, but I think they are a fantastic development, and people should think long and hard about removing them just to gain a few extra kw’s.

Totally agree about all the bloody 4WD's used to pick up the kiddies from school though!

[Frufru]

Dpf

the dpf doesnt use a catalyst and is a non-servicable item...

Some engines do use additives for DPF regeneration (e.g. older 2.0TDi from VW used to use it for some types of cars) - for example you have a little reservoir under bonnet which may need to be refilled every 100000 km. This is used for active regeneration as it is added to fuel to increase temperature of exhaust gases.

Catalyst in DPF is something different, it is used in almost all DPF from VW now. Not 100% sure what exact composition it is, but catalytic reactions usually do not use much catalyst anyway (maybe there is enough catalyst in DPF to last for engine lifespan?). DPF is servicable item - it may need to be unblocked in some instances.

[QUOTE=gldgti;148606]
the soot from diesel engines is not bad stuff, its basically dirt.
[QUOTE=gldgti;148606]
http://www.guardian.co.uk/science/20...arch.pollution

[gregozedobe]

DPF is servicable item - it may need to be unblocked in some instances.

I think the dealers can do a forced burn-off of the soot in the DPF (IIRC they call it "regeneration"). If that doesn't work they have to replace it. Maybe in time non-dealers may figure out a way to clean them out for re-use.

All I know is I'm glad I haven't had any problems with the DPF on my 2.5 TDI (probably because I do nearly all highway driving in it)

[Greg Roles]

...
Frankly, I’m surprised at all the negativity people seem to be displaying towards this great piece of technology. For me, the DPF was the reason I ultimately bought the car. I was after a car with good performance and relatively low CO2 emissions, but didn’t want to be belching out a heap of other nasties, so Diesels were initially off my shopping list. However, when I heard that the GT Sport was fitted with a DPF all that changed. Yes, I’m a tree hugger, and I don’t expect that the DPF will be a significant selling point for everyone, but considerably reducing pollution of any kind has to be a good thing, surely?

I hear you my friend, and I too am proud to have a peppy car that is a lot more environmentally conscious than most. Thing is if a few car nuts on here decide to remove it, I hardly think it'll bring the world to it's knees. Overall the simple fact that this technology will increase in coming years for the masses is a good thing. I hope China gets into it!

If you are indeed worried about your impact, become a veggo, for the environmental impact of being a typical meat eater makes any level of car emission look just silly.

[orsegtsport]

Yes it’s true, a few people removing their DPF’s will make absolutely no difference in the grand scheme of things, but that doesn’t make it right though. I guess I would argue that we all need to do our bit, because collectively we can have an impact. You are right about the vegetarian thing though, and becoming a vego can cut your ecological footprint in half. I’ve considered it, but all my favourite meals have meat in them – I blame my parents for that!

I had plans to dramatically reduce my footprint, and I sold my house last year so I could build an Eco home, but then the wife got pregnant and the cost of living in Perth went through the roof and now I can’t afford to do it. Ah well, I’ll keep playing lotto I guess….

Now, back on topic…..leave those DPF’s on there you naughty people!

[gldgti]

Jamie is on the ball as per usual. The pipe looks great to me from the DPF back, nice size and mandrel bent. Just ditch that last giant muffler and see how the middle one copes. I've read the diesel sounds quite acceptable with little to no mufflers, but I've yet to hear a horny diesel so I figure flow is more important than noise. The DPF is indeed the killer, and I'm sure we'll see a delete kit in the next year or so.

mmm horny diesel.... i looove that sound...

from 7.6l v8 turbo with twin straight pipes that actually crackled, to my old gld with 2.25" extractors that droned on and on but really barked, a nice big exhaust is always horny on a diesel, hehehehe... (yup i'm warped)

dont waste your money on stainless steel polished expensive brand named rubbish for your diesel either. its a load of C R A P. once you put a turbo on a diesel, the rest is either classed as fire hazard reduction, noise reduction or decoration.

if your into decoration... well i feel for your wallet. but the best performance exhaust for a diesel turbo (post turbo) is NO exhaust. thats the fact...

[Greg Roles]

Yeah, I hear you.

No exhaust is optimal for any turbo, and don't worry, the stock exhaust in the MK5 GT looks great, nice and fat with mandrel bends. I will at least swap out the muff's for better flow, but that's probably it.

The DPF, well we'll see. Don't want orse on my case! Damn hippies.
Good for you in wanting an environmentally friendly home, is my goal as well.

For the record, I've been veggo my entire life, was raised by damn hippies!
So I think I'm ahead in the impact game:

[dammfool]

soot

When i have my chip on my polo turned to the max setting and i give it a boot full, it would leave a semi to shame,with all the soot it produces.The cars behind me would be getting a lung full.I have to wash the back of my car once a week cause of all the soot?

[motk]

mmm horny diesel.... i looove that sound...

from 7.6l v8 turbo with twin straight pipes that actually crackled, to my old gld with 2.25" extractors that droned on and on but really barked, a nice big exhaust is always horny on a diesel, hehehehe... (yup i'm warped).

Pah! Try listening unmoved to the crackle of an English Electric 12-CSVT, or the bark of an ALCO 251C, or the throaty chant of an EMD 645, or even the steam-ship thud of a GE 7FDL-16!

... yeah, I'll stop now

[gregozedobe]

When i have my chip on my polo turned to the max setting and i give it a boot full, it would leave a semi to shame,with all the soot it produces.The cars behind me would be getting a lung full.I have to wash the back of my car once a week cause of all the soot?

Two things that worry me about this post are:

1 You seem proud that your small car can produce a huge amount of visible soot. Please consider other road users and turn your chip down to the point where it runs efficiently (and/or drive more thoughtfully thus enjoying even better economy and saving on car washes too ).

2 You seem to be unaware of what a negative effect you are having on the attitudes of people towards diesels.

Do you actually want the majority of people to dislike diesels so much that politicians either ban diesel cars altogether, or put such stringent pollution controls on them that most (including yours) are put off the road ? It would be very easy to instruct the police to automatically defect any car that is producing "excessive visible particulates".

Sorry to seem so negative, but in this case I just had to say what is on my mind.

[gregozedobe]

Pah! Try listening unmoved to the crackle of an English Electric 12-CSVT, or the bark of an ALCO 251C, or the throaty chant of an EMD 645, or even the steam-ship thud of a GE 7FDL-16!

... yeah, I'll stop now

I wonder how many people reading this even know what engines you are talking about ? I'll bet not very many (but happy to be proven wrong)

[Spoddy]

I wonder how many people reading this even know what engines you are talking about ? I'll bet not very many (but happy to be proven wrong)

you are not wrong....

[99gti]

*Insert game show buzzer*

For $50 I'm going to say train engines?

[gregozedobe]

*Insert game show buzzer*

For $50 I'm going to say train engines?

To collect your $50 from MOTK you will have to display a lot more knowledge about each specific engine than that (and no cheating by looking up google - I said "know", not "able to look up").

[dammfool]

After reading your response ill make sure that when i go to canberra next that my chip is set to 10 and ill flog the **** out of my small car so it produces the maximum amount of soot you clown

Two things that worry me about this post are:

1 You seem proud that your small car can produce a huge amount of visible soot. Please consider other road users and turn your chip down to the point where it runs efficiently (and/or drive more thoughtfully thus enjoying even better economy and saving on car washes too ).

2 You seem to be unaware of what a negative effect you are having on the attitudes of people towards diesels.

Do you actually want the majority of people to dislike diesels so much that politicians either ban diesel cars altogether, or put such stringent pollution controls on them that most (including yours) are put off the road ? It would be very easy to instruct the police to automatically defect any car that is producing "excessive visible particulates".

Sorry to seem so negative, but in this case I just had to say what is on my mind.