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  #1  
Old 12-06-2010, 03:35 AM
StevanA StevanA is offline
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Question What is the DPF?

I am wondering what is the DPF and why do people get it taken off their trucks? What benefit is caused by getting a DPF delete?
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Old 12-06-2010, 04:08 AM
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diesel particulate filter

Therefore no need to take it off a hemi as it does not exist on one. For diesels though it will allow that particulate to burn to the atmosphere instead of being filtered, basically giving the engine more power and use less fuel due to the lack of back pressure created when the filter is in use.
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Old 12-06-2010, 08:31 AM
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Thank you! When the DPF is taken off are those performance gains small or large? And is it legal to take the DPF off?
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Old 12-06-2010, 08:51 AM
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Yes, it is illegal in some states. It can also void the warranty on the truck.
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Old 12-06-2010, 10:03 AM
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What kind of increases in power and fuel efficiency would I see if i were to remove the DPF? What is the stock mpg on the 6.7 cummins engine anyways?
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Old 12-06-2010, 10:38 AM
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You will have to use a programmer/tuner once you remove the dpf to avoid the "check engine light" as these will turn the egr & dpf systems off and depending on the tuner, you can have increases of 175hp or more with a 2 to 4 mpg increase. My 2009 gets about 17.5 mpg around town but I haven't taken it on a trip yet but I would guess 20+mpg on the highway. I only have 3200 miles on my truck and I've heard that the cummins isn't broken in until 25k or more and thats where you will see your best mpg. I think 16mpg is what you will get with a stock pick-up. I've done a cold air intake, 4" straight exhaust, smarty jr tuner and a tonneau cover which all contribute to increased mpg. I run bfg 315/70/17 tires that hurt fuel economy a bit. Good luck
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Old 02-05-2011, 10:14 PM
Stangshcky12 Stangshcky12 is offline
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My girlfriends dad traded in an 05 5.9 cummins on a 09 6.7 cummins. He absolutely hated it and was looking for an 06 5.9 with low miles till I convinced him to put a dpf delete from H&S perfromance.
The dpf filters particulate as said and burns it off two different ways, passive and active. The truck will passively burn particulate when temperatures are high enough or it will actively burn it when the filter is full by sending raw fuel (up to several gallons) through the filter. The exhaust gases through the EGR and into the intake. This is all where the fuel mileage going down.
Stock the 6.7 was getting 14-16 mpg. From what I've seen a stock 5.9 can get nearly 24-25 mpg and with a dpf delete the fuel mileage is very comparable.
You need a programer with a dpf delete because it basically tricks the computer into thinking the truck is constantly in passive regeneration. Even with a stock tune I found the power difference before and after the dpf delete very significant.
DPF deletes are advertised as off road only because it is illegal to in some places.
I recomend H&S perfomance minimaxx tuner and there dpf delete kit. It was very simple to install. I really wish they would come out with a tuner for the 5.9 engine.

Last edited by Stangshcky12; 02-05-2011 at 10:17 PM.
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Old 02-05-2011, 10:40 PM
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If you take it off you will see a performance improvement. It is like a huge cat on a diesel. the thing looks like a little nuke or something, pretty cool to see out of the truck. If you do take it off you will need to get a tuner for it. The truck needs to burn the diesel better or else if you take it off you will smell the diesel due ot it sitting in the exhaust.

If you want to take it off they do make delete kits for it. Doing that would compliment an exhaust kit beautifully! They go hand in hand. If you have an exhaust it will sound better once you take it off as well. Definitely a good thing to take off if done right. I remember seeing a tuner HP gains with and with out the DPF. Without it the gains were like 50+hp and I forget the TQ but it was a big gain too.

The only thing about taking it off is it will void the warranty. You will also run into state laws about emissions. If you get the tuner it should fix the emissions though.

I think it is something to look into if you want to up the performance in the truck.
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Old 02-15-2011, 11:27 AM
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Default dpf explanation

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Old 02-26-2011, 09:42 AM
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How do you "regenerate" the filter? I just picked up a 2011 2500 Laramie with the 6.7 last week and I already have the "Filter is 80% full" message at only 400 miles on the truck! I live on an Air Force Base and I have primarily been driving it on base at low speeds/stop-go traffic this week. Do I need to get her on the highway and open her up? My dealer also had to drive it up from another dealer that is 300 miles away. Could they have done something to it?
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