Quote:
Originally Posted by Darth Niloc
Interesting you aren't the old person to have said this. I have never tuned a diesel before, its always been petrol and the advice then was always any restriction of any kind = bad. I've read many articles/guides/posts and have read through countless project build threads for 30d's and 35d's and all of them advocate removing the DPF. Wagner tuning and Ecotune both recommend it and even Darkside Developments who I personally rate as a top BMW tuner recommend removing the DPF and EGR as part of their stage one package. 
Is it a case of BWChiptune getting good results with the DPF fitted but even better results if it was gone? I understand the legality of removing the DPF but I have been assured that it won't cause a problem with the MOT and it is something that I will end up spending £££ to repair/replace at some point. You have thrown me a curve ball late in the game as I thought I had it all figured out and decided on lol. The car is booked in for next week so I will speak to the tuner again and see what he thinks.
Thanks,
Darth Niloc |
I too have heard good things about Dark side and seen many of their YouTube vids. I dare say even they would get good results while retaining the DPF in place.
It's one thing for your tuner and others to say it won't cause a problem with the MOT, but if you take it somewhere and they see any visible smoke when they test it a higher rpm they have to fail it. Of course some MOT people are more friendly than others so it's pot luck. Tuners will tell you that you won't get any smoke without a DPF, this is just plain wrong/impossible they all smoke, the difference is how much they smoke. A good tuner will be able to tune it to produce less smoke but never zero smoke. After all by tuning you are adding in more fuel (the source of the power) and air, but the fuel ratio will be higher hence you will always get smoke especially when you put your foot down.
All these people saying my car doesn't smoke when I boot it, may not see it in their rear view mirror, but the person following them will certainly see it. The DPF is the thing that removes the soot, without it there is nothing to stop the soot exiting the exhaust hence the smoke. This is what the MOT guys should be looking out for.
Of course it is your car and your choice whether to keep or remove the DPF. Were not hear to vilify you for removing it.
I think the general consensus is that if you are after up to 300 horses you can leave the DPF in place, above this when you are looking at larger injectors and hybrid turbos etc then this is when the DPF becomes a hinderance.
Maybe have a chat with the guys at Darkside and any other reputable tuners the guys on here may suggest before you go ahead with your plans.