So a friend of mine and I have started talking about making a complete DPF replacement pipe. I am wondering who all would be interested in this?
Why not leave all the DPF gear hooked up, but remove it from the exhaust system? You could trick the ECU into thinking its still there and operational but actually just route the exhaust around it. You could also try creating some sort of dual exhaust with a switch that would route your exhaust through a bigger pipe, but leave the DPF gear installed in case you have an emissions test.
Well, that's my opinion as well. No particular advantage to not having the DPF that I can see.
Current - 2010 GOLF 2-DR TDI MT6
Past - 1978 Scirocco | 1981 Scirocco S | 1986 GTI 8v | 1990 Corrado G60 | 1991 Jetta GLI 16v (bought new in '91, given to son in 2010)
Sorry guys, but there is a HUGE advantage to removing the emissions devices. (not just bypassing) they are very restrictive and very heavy. There will definitely be a mileage increase (2-3 MPG conservatively?) a power increase, and also allow you to tune the engine much more without worry about the DPF.
But, it's also very illegal for on road use, and difficult to do considering the DPF is pretty much tied into the turbo/exhaust manifold (or so I believe, I could be completely off base there)
Check this out
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Last edited by quailallstar; 08-06-2010 at 06:23 AM.
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There are Huge gains after removal of DPF. Power gain, torque gain and 10-20 mpg. The Cheapest way to do this mod would be removing your PDF of the car. Cutting out a section,removing filter material inside and welding it backup. ECU will also need to be modified/re flashed so ECU No longer requests any regeneration, this is what dramatically improves MPG. If you can read the ECU file yourself i can modify your file to delete DPF so there would be no regeneration and not codes thrown for DPF. PM me if anyone is interested.
I can see where mileage would increase without the DPF. If you understand how the DPF works, you'd know that raw fuel is tossed downstream to the DPF at just the right temperature to burn all the soot out.
Imagine if you could use that fuel, for say - driving?
Here in California we have some pretty stiff penalties for messing with the emissions. I guess I better pass on this mod.
2010 CW Golf TDI DSG 2DR - Euroswitch - LED tails, turns - Clear corners - GTI sideskirts - Audi stainless tips - Porto alloy spare - Plastic battery box - 9W7 Bluetooth
2013 RS Golf 2.5 6AT 2DR - Bone stock
I'd be very interested to see what kind of power and efficiency improvements are to be had by nixing the DPF, assuming we can keep the ECU happy of course. Yes I understand this increases stuff leaving the tailpipe, but at the moment I'm just thinking out loud experimentally.
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Previously known as Son of a B...5er!
A friend of mine removed the Dpf on his 08 f-250 and saw huge gains in power and fuel economy. I dont see why it would be much different for the tdi guys. The Dpf does nothing for the cars performance only hurts it. The Dpf for the environment is a different story but I'm just hitting the benefits of removal.
11 mk6 gti APR KO4 12.0@119 GoAPR
What I am really hoping is that we can run full bio-diesel with the DPF delete. All the environmental concerns surrounding this issue would then be smashed in my opinion. Please chime in if anyone has experience with the running b20 or above on a newer VW with DPF delete. It would be pretty awesome if I could have over 200hp running off vegetables
Hello guys im a noob here and hope to put in some of my knowledge form what i have researched, i have been a diesel mechanic as a job for over 6 yrs but have just recently got into the computer aspect of vehicle modifications. I also hope to hear alot of advice form the veterans on here too!
epic designs- From what i have read and understand is that you really cant get the mixture right to get real power out of these little beasty engines because the computer will sense more soot adn heat in the DPF and will actually shut it down on the power and the air/fuel ratio. But without this crap in the computer you can tune it to unbelievable numbers because the computer isnt trying to stop the soot from happening.
Son- Yes it has been all over europe for awhile now even in other countries. They simply remove the DPF 'file' or program from the ECU because they dont have EPA breathing down their neck.
Branman- from what i have read searching the net. The EPA has mandated that the DPF is now a smog device on the TDI but wasnt on the trucks a few years back. They (EPA) is now making it tougher for the old saying "off-road" to be used.
Germangorilla- You would be able to run pure WVO or biodiesel because the DPF will not clog up. That is our limiting factor in using those types of fuel is they dont burn the same way as reg diesel so they gum up the worm holes and other passage ways in the DPF.
I already have a stage 2 malone tune, and its quite powerful even with the dpf system intact.
The computer doesn't seem to be limiting anything, and the power difference is obvious. Stock, the car could not break traction, and now the ESP light flashes even in 3rd gear under hard acceleration.
That being said, obviously I am near the limit of power output with the DPF intact. If I sustain full-throttle, high load, after about 20 seconds the EGT limits are reached and the engine reduces power output.
However, by the time 20 seconds is up I am going way too fast for public roads anyways, so it has only affected long uphill climbs at high speeds on the highway.
Thanks germangorilla. i hear you on the waiting game. I have to wait til its paid off. Its a deal the wife gave me.
epicdesign thanks for the info. when does your car start leveling out in the RPM range? in stock form mine seems to level out at 3500rpm into almost redline.I have the 6mt and its hard to keep traction on the roads in 1st and second but 3rd HOLY CRAP! I couldnt imagine having that much power and torque.
What program are you using to read/modify the ECU?
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Last edited by dhambrick; 02-08-2011 at 02:00 PM.
You don't need to cement the block to run 50psi .. people do it but not needed, especially not in a street truck like that.
There was one that got into the top 16 I think when all out came to Atlanta.
Another time went to a mopar show there with a diesel drag race going on at the same time (went for the racing now the show) one guy was running a compound setup on 12V cummins in a tube frame dakota (I think) 80+psi non intercooled just ran straight water injection for cooling. It ran so much water through that with blow bye he had to change his oil after every run!!!
Only diesel still in my life is my cummins swapped TJ
but if I don't like the leaf after a test drive in a few weeks I think a JSW TDI will find its way to my home
not trying to raise up a necro thread but I've been thinking about this dpf thing for a few weeks now.
I have 19k on my 11 tdi wagen and at the rate im going, ill be out of warranty this year.
I dont really care about extra hp/torque too much. if I got more, I wouldnt complain either....
mainly im just looking for better mpg.
I live in idaho and there are no emission checks for me. I drive on a hwy about 65 miles a day at 73-77 on cruise. im lucky to get 37mpg.... 520 a tank. I would love to see that number in the 600-650 range.
are there cost effective ways to remove this and just run a straight pipe from the cat back?
and by cost, i mean letting the car not throw lights and codes and still try to burn the dpf every couple thousand K