Restriction, what restriction! DPF, say no more

[Greg Roles]

Hmmm, thanks for the replies. Like I said, I had only heard about catalysts, and the story was from the UK and generic to DPF diesels, so yeah it was only a guess that VW was doing this.

http://www.torquecars.com/tuning/particulate-filter.php

I thought Ultra fine particles from diesels were a problem, in that they basically stuck around in the air and can end up in your lungs causing problems. Hey, I realise petrol cars cause plenty of problems, and don't even get me started about 4WD's carring one school child.

[Mischa]

i cant wait for a company to bring out a complete all-in-one dpf delete. once that happens ill go chip my car the next day

[Jaymz]

i cant wait for a company to bring out a complete all-in-one dpf delete. once that happens ill go chip my car the next day

Better go get your car remapped Mischa, click here to lighten your wallet by thousands

These guys make all the exhausts for the race series.
Am waiting for a quote to come back now. Be awhile before i go ahead and do something like this, but it would be nice to know how much.
It is good that they make it in sections as the cost to build a downpipe locally would cost plenty. Could always organise a group buy for the downpipe and connecting pipe somewhere in the future and have a local guy make up the rest.
Would be inexpensive to have someone local make the rest up as its straight all the way up to the rear muffler which goes into a dogs leg and then has a muffler that would give a Mack truck a hard on!

[Mischa]

id imagine at least 5k for the full exhaust. although possibly a group buy on just a downpipe sounds like a great idea.

[Greg Roles]

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.

[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]

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!