Modifying the DPF and Leaving It Installed
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Freshman User
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Modifying the DPF and Leaving It Installed
All the discussion regarding basic/inexpensive performance mods to the 6.4L PSD seem to be in regards to removing the DPF, replacing it with an aftermarket exhaust and/or straight pipe, and retuning with a tuner module. Apparently this creates a potential for being denied warranty coverage, and putting the DPF back on isn't necessarily practical in all cases (when traveling).
So what if the stock DPF was modified to improve its aspiration? I wonder if anyone has tried opening one up to remove some of the filter mechanism inside. What if you could help it move more air but leave all of the sensors etc in place, and do it in such a way that modification was undetectable without the dealer cutting the thing open. I imagine that you could do it in such a way that regens still occur, but maybe not nearly as frequently, meaning no tuner module is necessary for those not willing to take the risk.
If this could be done, I could see a real market for a company like Bully Dog or Banks to offer the modified DPFs with a core return of your original DPF. Does such a thing exist?
So what if the stock DPF was modified to improve its aspiration? I wonder if anyone has tried opening one up to remove some of the filter mechanism inside. What if you could help it move more air but leave all of the sensors etc in place, and do it in such a way that modification was undetectable without the dealer cutting the thing open. I imagine that you could do it in such a way that regens still occur, but maybe not nearly as frequently, meaning no tuner module is necessary for those not willing to take the risk.
If this could be done, I could see a real market for a company like Bully Dog or Banks to offer the modified DPFs with a core return of your original DPF. Does such a thing exist?
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Freshman User
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I don't know if you could leave it hollow, I doubt it would sound the same unless a straight tube was added down the middle. I don't know what the inside looks like but I'm assuming it has some baffles and a matrix of metal screens (total guess). I'd be real interested to see what would happen if you removed enough of the internals to allow more air to pass through while still retaining its original function.
Posting Guru
Joined: Mar 2006
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From: Long Island, NY
My main concern would be when the truck goes into regen and it begins dumping fuel and sending the EGTs through the roof. I am pretty confident the truck would throw a code. And if the main goal is fuel savings, not addressing the regen cycle will not increase MPG that is for sure. So to me, a straight pipe and a tune seems to make the most sense... You are addressing both the pipe and the regen.
Hotshot
Joined: Nov 2000
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From: Pflugerville, tx
well you couldn't allow regen of course.. have to have a tuner, but you don't need to leave the tuner installed when u take it in for inspection etc..
this was only for visual inspection purposes.. without pulling the case off, no one (normal) would ever know
Sam
this was only for visual inspection purposes.. without pulling the case off, no one (normal) would ever know
Sam
Logistics Pro
Joined: Nov 2001
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From: Georgia
Good thinking, but with a few questions. Wouldn't that hollow exhaust with a regen make the truck into a flame thrower, I think there was a utube video about it. Good idea putting a pipe inside a hollow DPF to pass visual inspection except the black exhaust would at least raise questions for an inspector who knew what they were looking for. And, there is still the warranty issue, I don't think the hollow DPF would fool a ford tech.
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Hotshot
Joined: Nov 2000
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From: Pflugerville, tx
well, they say (other section), that you have to put your foot in it to get soot exhaust...
isn't a DPF delete a straight thru pipe? of course you could NOT allow regen with a straight thru..
Sam
isn't a DPF delete a straight thru pipe? of course you could NOT allow regen with a straight thru..
Sam
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Cargo Master
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A buddy at work did a DPF-delete and tuner on his 6.4L and it doesn't smoke a whole lot. If you are driving normally it doesn't put out any black, only when you step on it.
The problem with a "de-tuned" DPF is that the function of it is to trap particulate matter. The engine burns rich to begin with to keep the NOX emissions down then the DPF takes care of the particulates. If you knock out the functionality of the DPF you will be emitting more particulate matter. If you ever have any kind of exhaust test done by inspectors the high level of particulate matter would set them off to something being goofy.
The problem with a "de-tuned" DPF is that the function of it is to trap particulate matter. The engine burns rich to begin with to keep the NOX emissions down then the DPF takes care of the particulates. If you knock out the functionality of the DPF you will be emitting more particulate matter. If you ever have any kind of exhaust test done by inspectors the high level of particulate matter would set them off to something being goofy.
Senior User
Joined: Feb 2007
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Hollowed out
Does anyone know of anyone hollowing out the DOC & DPF? I assume that is can be done without causing exhaust leaks like they they used to do back in the 70s and 80s when catalytic converters used to seriously degrade MPG and performance?
Post Fiend
Joined: Jan 2009
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From: Greenwood, SC
Well, back in early '08 some of us that just got 6.4's were hoping that in a few years somebody like Flowmaster or K&N would develop and market a direct replacement for the factory DPF promising less restriction, better exhaust flow, better MPG, etc....
Problem is, at the time, understanding that the PCM monitors backpressure and uses that information to determine the fueling of the injectors/EGR/regen. A low restriction DPF would foul all that up.
Ideally, an aftermarket DPF that would not require a PCM flash AND give a performance upgrade would be the ticket.
Problem is, at the time, understanding that the PCM monitors backpressure and uses that information to determine the fueling of the injectors/EGR/regen. A low restriction DPF would foul all that up.
Ideally, an aftermarket DPF that would not require a PCM flash AND give a performance upgrade would be the ticket.