DPF Delete on VW TDI engine or Audi TDI

[QuitersLOSE14]

How hard is this to do? Will it throw sensors? What are my options to get rid of it?

[chittychittybangbang]

100% yes it'll throw error codes. I don't even think it would run well without it since the computer might send the car into limp mode if it doesn't get expected feedback from the various sensors. You have to have an engine tuner delete it in the software. Part of it is that the exhaust self clean cycle will be dumping fuel into the exhaust without the DPF in place. Here is more on the system: http://www.myturbodiesel.com/1000q/D...AQ-VW-Audi.htm

FYI, the car's emissions will go way up and if you have state visual or smoke inspection you'll definitely fail.

EDIT: Yes it will run, I was told that the car would go into limp mode but it appears not.

[fujii13]

Originally Posted by chittychittybangbang

100% yes it'll throw error codes. I don't even think it would run well without it since the computer might send the car into limp mode if it doesn't get expected feedback from the various sensors. You have to have an engine tuner delete it in the software. Part of it is that the exhaust self clean cycle will be dumping fuel into the exhaust without the DPF in place. Here is more on the system: http://www.myturbodiesel.com/1000q/D...AQ-VW-Audi.htm

FYI, the car's emissions will go way up and if you have state visual or smoke inspection you'll definitely fail.

Why will emissions go way up? It's burning the same amount of soot (just all the time, instead of infrequent bursts), and with a proper tune the fuel injectors wont be squirting fuel into the exhaust to burn off the soot. I'd say overall emissions will go down and DPF is just to make it so you don't see dirty black soot out of the exhaust.

[QuitersLOSE14]

Originally Posted by chittychittybangbang

100% yes it'll throw error codes. I don't even think it would run well without it since the computer might send the car into limp mode if it doesn't get expected feedback from the various sensors. You have to have an engine tuner delete it in the software. Part of it is that the exhaust self clean cycle will be dumping fuel into the exhaust without the DPF in place. Here is more on the system: http://www.myturbodiesel.com/1000q/D...AQ-VW-Audi.htm

FYI, the car's emissions will go way up and if you have state visual or smoke inspection you'll definitely fail.

You mentioned having the engine tuner remove the software for it. So after you do this can you remove the DPF? Also the whole reason I'm inquiring about this topic is because I plan on an ECU re-flash for the 140-170hp increase. A lot of the manufactures recommend a DPF delete. Is this a physical delete or software one?

[chittychittybangbang]

Originally Posted by fujii13

Why will emissions go way up? It's burning the same amount of soot (just all the time, instead of infrequent bursts), and with a proper tune the fuel injectors wont be squirting fuel into the exhaust to burn off the soot. I'd say overall emissions will go down and DPF is just to make it so you don't see dirty black soot out of the exhaust.

Because the DPF reduces particulate emissions, it doesn't just capture and burn them off in spurts. If VW could have passed emissions without fitting an expensive DPF they would have done so.

Originally Posted by QuitersLOSE14

Is this a physical delete or software one?

Both physical and software. I don't know how the engine would run if you just cut the DPF out but I know it won't run right without the software accounting for it.

[speedracer1407]

Originally Posted by fujii13

Why will emissions go way up? It's burning the same amount of soot (just all the time, instead of infrequent bursts), and with a proper tune the fuel injectors wont be squirting fuel into the exhaust to burn off the soot. I'd say overall emissions will go down and DPF is just to make it so you don't see dirty black soot out of the exhaust.

To clarify what Chitty responded with, the DPF stores soot permanently. It doesn't store it for a little while and then empty itself during a regen cycle.

Soot is the result of incomplete fuel burn, which is an inherent part of burning diesel fuel: it burns slowly, which is a challenge for piston diesel engines since they require rapid, frequent combustion events to produce power.

The DPF stores soot, and the regen cycle adds heat (by way extra fuel into the DPF) t to "complete" the burn, which turns the stored soot into stored ash. The DPF has a finite life: when it's full of ash, it needs to be replaced. Little or no soot stored in the DPF is ever emitted.

Removing the DPF will result in a huge increase in emissions, and the worst kind too, since soot is much more immediately harmful than greenhouse gasses. Also, unless you also remove the catalytic converters downstream of the DPF, I suspect that they would become clogged with soot rather quickly.

[QuitersLOSE14]

Originally Posted by speedracer1407

Also, unless you also remove the catalytic converters downstream of the DPF, I suspect that they would become clogged with soot rather quickly.

Hmm thats something to think of since I'm sure an ECU re-flash will mean even more soot.

[chittychittybangbang]

Originally Posted by QuitersLOSE14

Hmm thats something to think of since I'm sure an ECU re-flash will mean even more soot.

Just to clarify something, the DPF is a filter. The other things are catalysts. The construction of each passageway on the DPF is a dead end, meaning that it really is a filter. The construction of each passageway on the other catalysts are tubes. Some stuff can pass through them but too much can clog them as well. They were surely designed to work with the DPF so I don't know how much it would take to clog them.

[Feyd]

Anyone have an estimated life-span for a DPF?

[chittychittybangbang]

Originally Posted by Feyd

Anyone have an estimated life-span for a DPF?

The end of life for the DPF is until it can no longer be cleaned, which is pretty much until the stainless steel hosing rusts out.

It must be removed and cleaned when soot loading reaches 45 grams. VW says to check it at 120,000 miles and every 10,000 miles afterwards. Take a look at the immobilizer page, on page 2 it shows how to check.