The 6.6L engine's DPF is based on GM-patented technology and proven supplier components. It traps diesel particulate matter in a honeycomb-like ceramic "brick" after it travels through an oxidizing catalyst. Remaining exhaust gases are routed out through the exhaust system. To ensure optimal performance, the system must undergo periodic "regeneration" to release accumulated soot from the filter. The regeneration process uses heat to burn off the soot and, in most cases, is performed automatically.
An onboard computer controls fuel injection and oxygen content to adjust the exhaust energy to the appropriate level to clean the particulate trap. Periodic servicing of the filter is required to remove accumulated ash. The DPF and corresponding components will change the exhaust system length and/or outlet design, depending on the vehicle model. Also, an expanded underbody heat shield is added.



Can anyone tell if this means that this so called "brick" filter unit could be removed similar to catty, reducing a LOT of backpressure? I'm sure it'd haev to go back in before emissions inspections, but taking it out sure seems like it could add a bit of power. Also, hopefully we wont lose the ability to blow black smoke if we really feel like it...

1. it is highly illegal, as in some board cop nails your butt for blowing smoke aka tampering with federally mandated emissions equipment.
2. would likely totally piss off the computer, and cause more problems then it would solve....

so i have a feeling then that aftermarket exhaust systems will be hard to make for the truck, unless they are a cat back system.

I forget where I read it but I believe the DPF is actually going to take the place of the muffler..which would make sense. Probably make it harder to do any sort of exhaust.

1. it is highly illegal, as in some board cop nails your butt for blowing smoke aka tampering with federally mandated emissions equipment.


The Clean Air Act amendment of 1990 (Section 230 (a) (3) A and B) essentially says its illegal to tamper with emissions but gives no "teeth" to is as there are no penalties. The penalties are determined by the state. The only place I can see anyone being prosecuted for tampering would be the overtaxed "feel good" states that have more goverment employees than the private sector. Yet I have never heard of anyone being prosecuted. They do however prosecute businesses for engaging in this activity.

After reading the Clean Air Act of 1990 there is a TON of feel good crap in there that I don't believe has been enforced.

My feeling on this is its MY TRUCK. We are the ones who fork out 30-50 thousand dollars for these things? When the state or feds pay for MY TRUCK then they can tell me what to do with it...OK RANT OVER!

1. it is highly illegal, as in some board cop nails your butt for blowing smoke aka tampering with federally mandated emissions equipment.


my truck isnt CT-legal as it is, it just means I have to bolt my stock exhaust back on every 4 years for emissions, and claim the stacks are just for show. in my mind its just a price i have to pay, and i dont mind it. its 2 hours labor ever 4 years.

in CT, and maybe federally, there are visibile emissions laws, and as far as i know, if you get a ticket, you can get it nulled by having the problem fixed and then having your car inspected


2. would likely totally piss off the computer, and cause more problems then it would solve....

i'm guessing that some sort of bypass or emulator is feisable, but i'm not sure exactly how complicated it would be. somewhere between unplugging a sensor and flashing the ECU i'd imagine.

i'm hoping that manufacturers will find ways to develop products as good as the ones for the current dmax's, that'll mean a lot.

The Clean Air Act amendment of 1990 (Section 230 (a) (3) A and B) essentially says its illegal to tamper with emissions but gives no "teeth" to is as there are no penalties. The penalties are determined by the state. I guess you don't consider this to be big enough teeth, eh?

http://www.epa.gov/compliance/resources/policies/civil/caa/mobile/tamperpenpol.pdf

A. STATUTORY PENALTIES

Tampering Prohibition

Under section 205 of the Act, any manufacturer or dealer' who violates the tampering prohibition, "(3) (A)", is subject to a civil penalty of not more than $25,000 per violation. Any person other than a manufacturer or dealer who violates the tampering prohibition is subject to a civil penalty of not more than $2,500 per violation. Any such violation with respect to the tampering prohibition constitutes a separate offense with respect to each motor vehicle or motor vehicle engine.

Defeat Device Prohibition

Also, under section 205 of the Act, any person who violates the defeat device prohibition, "(3) (B)", is subject to a maximum civil penalty of $2,500 per violation. Any such violation with respect to the defeat device prohibition constitutes a separate offense with respect to each part or component.
My feeling on this is its MY TRUCK. We are the ones who fork out 30-50 thousand dollars for these things? When the state or feds pay for MY TRUCK then they can tell me what to do with it...OK RANT OVER!And if you defeat enough components a number of times THEY could end up owning your truck.:(

My feeling on this is its MY TRUCK. We are the ones who fork out 30-50 thousand dollars for these things? When the state or feds pay for MY TRUCK then they can tell me what to do with it...OK RANT OVER!
I concur. The Gov tells me I've got to have a PCV, EGR and a CAT. So now the new trucks use twice as much fuel. Now they are trying to make me spay my dog and have her microchipped. Next, well who knows. Where will it end? Electric trucks?????-:t:rant::rant:

What ignorance.

First off, the PCV and EGR to not contribute to decreased fuel economy, at least in noticable amounts. The PCV valve wouldn't be even detectible, its purpose is solely to dump crankcase fumes, mostly blowby, into the same conditioning that exhaust gasses are processed. It eliminates all the blowby fumes from going straight into the atmosphere, at nearly no cost to engine performance (SLIGHTLY less air... I've never heard of any performance guru who recommends removing a PCV... it must be on the magnitude of hundredths of a horsepower). It also slightly extends oil and engine life by removing moisture.

The EGR valve is designed to GREATLY remove NOx emissions. There too, there is little reason to remove or disable it. EGR valves are controlled by rpm and throttle position, and limit flow while you're accelerating. To a lesser extent than a PCV valve, removing/disabling the EGR gives very little performance benefit, and a huge emissions disadvantage. At different parts of the curve the EGR system provides better fuel economy.

The catalytic converter is, of course, another important piece of emissions control. Both the PCV valve and the cat has been put in cars since the 60s and 70s, before the Bush's were around to force technology to be put on your car to decrease fuel economy to help their stocks or whatever crazy thought you believe.

Unfortunately, the cat does have a negative impact on engine performance. And a huge effect on emissions. I believe it has much less of an effect on emissions on a gas engine than a diesel, as the early duramaxes did not have converters IIRC, but it still has an effect.

I don't have a problem with a performance enthusiast removing a cat, but if the government wasn't requiring them there would be millions of cars running without them... and we'd be in trouble. Acid rain doesn't do well with todays paints, would you want the finish on your 99 looking like an early 90s GM with the peeling clearcoat? :)

The federal laws are poorly enforced but 99% of the population follows them, which is good for everyone. Being stuck under emissions testing must suck though, but it's probably for the better.

Anyway, the LPE vette makes 850-1000hp through dual performance cats, and definately has a PCV valve... and probably an EGR. No reason to remove that crap for 30hp.

BTW, How happy are you going to be when you have to refill your urea tank every oil change on future models? :)

wow is a tree near by that spacehog can hug?

i would guess in due time they (r&d, or tuners) will have fixes to defeat all of the hp, fuel robbing devices on your new trucks. im actually a little surprised on how long it takes for some of these performance mods to come out for our trucks. im new to diesels but have raced sport bikes for years and as soon as a new production bike comes out within weeks there are performance mods all over the net. disable this, or bypass that, jumper a resistor between A & B.

the manufactures build motors to meet the needs of masses. they want to try to make everyone happy power, fuel mileage, comfort, drivability, and also please the government. they are capable of making motors that could get 30-40 mpg in our trucks but why cut the hand that feeds you, i'll scratch your back you scratch mine.

spacehog is right in on way. 90% of people just want to buy a car/truck and drive it. for the rest of us we buy a brand new vehicle and are thinking of how we can hack it up before we get her home. i had a brand new 2000 gsxr 750 and before it had 200 miles on it it was in a pile of bolts and parts. totally gone over and rebuilt 140hp stock 160hp rebuilt weight reduced from 420lbs to 380lbs

Ignorant? I don't think so. I never said the PCV decreased fuel economy or horse power. What I do know is that on my Jeep Liberty Diesel it makes a rediculous mess inside the turbo, intercooler and intake system. It's so bad that it had oil running down the side of the block at the very first oil change due to venting just prior to the turbo intake. I posted photos of a black inducer covered with sticky black sooty oil that can't possibly help the thing spool. PCV is a great Idea for most vehicles I just think an oil air seperator would be a much better idea than taking the cheap route and sending all the blow by through your charge air cooling system. How many of you Duramax guys have oil dripping out of the bottom intercooler boots???? Hhhuuummmm?
I like breathing clean air as much as anyone else. But check out a brand new Dodge and you will find that due to all the crap they bolt on,"mostly emission control stuff, they are only averaging 15 mpg where as my 99 gets 20 even with my mods.
As far as EGR goes, read your service manual. Its there to lower the flame temp. But figure density altitude in and the hotter the air the less oxygen. Makes no sense to dump hot air into a system after trying to cool it down through an intercooler. Heat it back up with hot exhaust gas and it defeats the purpose. Go out to the track on a hot day and see what it does to your performance.
I am more than open to comments that help me learn better ways to fix the pollution problem. I just don't think the gov always has our best interest in mind so they are throwing gasser fixes at a diesel problem.
My 2 cents.

ha,be nice,we need all these emissions devices so we all can breath air and drink clean water and help all the illeagels get good jobs with all the money were giving the gov to protect us and them

now just take an other drink of the red coolaid and everything will be ok

purple coolaid ;)

The fuel economy decrease that you may see on the new emissions engines will be primarily due to the extra fuel that they inject to regenerate the DPF. That should be about the only thing that would adversly affect MPG.

As far as removing the innards.....no such luck. The ECM reads the Delta P across the DPF to determine when it needs to regenerate. That is the pressure differential across the filter assembly. Unless you have some way to fool the ECM into thinking the innards are still there after you remove them. You will be in reduced power mode (limp home) before you can get out of your driveway!

i have read that epa/manufacturer's will be installing wire seals on wire connections and fastening bolt for exhaust to prevent removal and sensors to recognize removal and put ecm in limp mode. epa's looking at raising revenue monies for congress to waste. egr impeds engine effecency, pretty much like diesellady stated. lower NOx and higher MPG will never occur, another reason for lost mpg is mfr's adjusted engine rpm(ecotec,vortec, itec engines) to get engine into rpm band where egr has reduced effect. electric is not going to be answer, they will go after ionized emissions from motors pretty soon, they just want us to walk,peddle then they'll try and stick sniffer on us. president of Peugot has told European Union(EU) that their emissions are unreasonable/unrealisitic.

As far as removing the innards.....no such luck. The ECM reads the Delta P across the DPF to determine when it needs to regenerate. That is the pressure differential across the filter assembly. Unless you have some way to fool the ECM into thinking the innards are still there after you remove them. You will be in reduced power mode (limp home) before you can get out of your driveway!

I will 2nd this. Pressure drop across the filter is one method they are going to use. There are others that aren't proven yet.

If fingers can figure out a way to get past all of the checks and double checks the ECU will go through, I will truly be impressed.
The OEM's are being very cautious about these DPFs.
Main reason, they require high temps to regenerate (600 degrees C ~ 1100 to 1200 degrees F). Running the engine at those temps for an extended period of time :badidea: . I realize we can hit those temps at/near the turbo on just about any of these trucks, but the filter has to see those temps. Can you imagine what the turbo temps will be is the DPF has to see 1200 degrees to regenerate and clean itself out.
I bought a 2006 just cause I don't want to have to deal with all of that stuff. The CAT is more than I want to deal with.

"Can you imagine what the turbo temps will be is the DPF has to see 1200 degrees to regenerate and clean itself out."

Hopfully not that high. The extra fuel will be injected after the turbo and it shouldn't see those temps. Now the CAT engine, that's a different story. I believe they are planning on injecting the extra fuel AT the turbo.

Maybe that's why they are having so many problems and will not release half of their engines until 2008?

Good ol epa at its best -:t . If they are going to put emissions on something should be gas engines. Diesels are the best engine out there. also one of the cleanest burning too. Also dmax3500 is right

What ignorance.

First off, the PCV and EGR to not contribute to decreased fuel economy, at least in noticable amounts. The PCV valve wouldn't be even detectible, its purpose is solely to dump crankcase fumes, mostly blowby, into the same conditioning that exhaust gasses are processed. It eliminates all the blowby fumes from going straight into the atmosphere, at nearly no cost to engine performance (SLIGHTLY less air... I've never heard of any performance guru who recommends removing a PCV... it must be on the magnitude of hundredths of a horsepower). It also slightly extends oil and engine life by removing moisture.

The EGR valve is designed to GREATLY remove NOx emissions. There too, there is little reason to remove or disable it. EGR valves are controlled by rpm and throttle position, and limit flow while you're accelerating. To a lesser extent than a PCV valve, removing/disabling the EGR gives very little performance benefit, and a huge emissions disadvantage. At different parts of the curve the EGR system provides better fuel economy.

The catalytic converter is, of course, another important piece of emissions control. Both the PCV valve and the cat has been put in cars since the 60s and 70s, before the Bush's were around to force technology to be put on your car to decrease fuel economy to help their stocks or whatever crazy thought you believe.

Unfortunately, the cat does have a negative impact on engine performance. And a huge effect on emissions. I believe it has much less of an effect on emissions on a gas engine than a diesel, as the early duramaxes did not have converters IIRC, but it still has an effect.

I don't have a problem with a performance enthusiast removing a cat, but if the government wasn't requiring them there would be millions of cars running without them... and we'd be in trouble. Acid rain doesn't do well with todays paints, would you want the finish on your 99 looking like an early 90s GM with the peeling clearcoat? :)

The federal laws are poorly enforced but 99% of the population follows them, which is good for everyone. Being stuck under emissions testing must suck though, but it's probably for the better.

Anyway, the LPE vette makes 850-1000hp through dual performance cats, and definately has a PCV valve... and probably an EGR. No reason to remove that crap for 30hp.

30hp is worth every lil bit...muhahaha


Sounds like somebody is friends w/ Gore,hehe

Dang, if the emissions crap keeps decreasing the mileage to the point of it being the same as a gasser, what would be the point in paying $7500 extra for the diesel, so you can fill up on 30 cent a gallon higher priced diesel?

30hp is worth every lil bit...muhahaha


Sounds like somebody is friends w/ Gore,hehe
:funnypost

And if you defeat enough components a number of times THEY could end up owning your truck.:(

:lol: I stand by what I said...Its my truck and I paid for it and there is no tree huggin, Koolaid drinkin, granola eatin, whiney little ba$tards gonna tell me what I can or cannot do with it.

Anybody worrying about being able to upgrade 2007 low-emission diesels, here's my $.02:

Stricter laws drive innovation. Nothing the OEM's come up with is fool-proof, especially when dealing w/ an intelligent & determined aftermarket full of outstanding engineers and a consumer base full of individuals willing to sacrifice their vehicles in the interest of furthering performance.

Many act like the new standards are the end of performance mods, but I think the opposite will be true, & the EPA has done nothing more than to lay down a challenge.

We WILL have our power.

Anybody worrying about being able to upgrade 2007 low-emission diesels, here's my $.02:

Stricter laws drive innovation. Nothing the OEM's come up with is fool-proof, especially when dealing w/ an intelligent & determined aftermarket full of outstanding engineers and a consumer base full of individuals willing to sacrifice their vehicles in the interest of furthering performance.

Many act like the new standards are the end of performance mods, but I think the opposite will be true, & the EPA has done nothing more than to lay down a challenge.

We WILL have our power.

:exactly: :exactly: :exactly: :exactly: :exactly:
WOW!!!

It doesnt get any more true than that...
VERY WELL SAID Dieselspeed, I couldnt have said it better myself! :ro)

Dieselspeed seems to know more about diesels than most people who think they know about the new 2007 diesels.

I couldnt agree with you more buddy!

:grd:

I think all of you who doubt the new 2007 Diesels, DEFINATELY need a few lessons from this man right here.
;)

Yeah, some of you guys know diesels, and some of you really go off the deep end on macho braggadocio, and some are just too young to know better, but I know bureaucrats. Bureaucrats and enviro-nazis are pointy-headed scrawny little nitpickers that absolutely hate everything we do, especially if it has any hint of testosterone involved. They hate beer, guns, fat, frying in fat, killing things with guns and frying the meat in fat, tobacco, smoking (my gosh you'd think it was radioactive. Al Gore says smoking causes global warming!), why they even hate the prescription drugs you take because when you go pee-pee the stuff gets into the water and makes the little fishies change sex! Now these guys have already decided that the new diesel trucks will eventually be made foolproof so that if you tamper with the emissions system the ECM will immediately incapacitate the vehicle. Beyond that, I suspect that the nutered ones in Birkenstocks, will place restrictions on clearing the codes and restoring the vehicle to operation. Moreover, if enough folks violate the emission rules, I suspect the pinheads will simply place a need requirement on the sale of light diesel trucks, selling them for commercial use only, or place exorbitant licensing fees and extra "environmental" taxes on them. Then will come mandatory inspections and "spot" roadside inspections paid for by the special taxes. The final step would be the outright ban on the sale of light diesel trucks or engines. Remember, the pinheads lay awake at night and gather in seminars dreaming up ways to screw with you! The real solution is a revolution, but really - do you think that's going to happen with this estrogen saturated population of pierced faced wimps?
:lol:

axlenut: I really see things going the other way; the rest of the world loves diesel due to them being cleaner than gassers & more economical to operate. New emissions regulations would indicate to me preparation for diesel use on a much larger scale than ever before, and OEM's are at least working diesel into forecast light-duty applications.

NOTHING is foolproof.

axlenut: I really see things going the other way; the rest of the world loves diesel due to them being cleaner than gassers & more economical to operate. New emissions regulations would indicate to me preparation for diesel use on a much larger scale than ever before, and OEM's are at least working diesel into forecast light-duty applications.

NOTHING is foolproof.

Yes, yes, you're right - that's why I laid down my cash for the DuraMax - but don't make the following mistakes:

1. Equate logic with enviromentalism or governmental thinking.

2. Fail to realize that government is an assembly of otherwise normal people who become irrational and hysterical in concert, especially when an agenda or money is involved.

3. My comments are directed toward those who are interested in defeating or otherwise removing the emmisions equipment (and maybe having a laugh at the expense of both sides).

Of course, as the technology advances, we should see further gains in pollution reductions and an increase in mileage. Eventually the aftermarket product manufacturers will be able to meet your needs without defeating the emmisions regulations. As your note implies, the developments in diesel tecnology are coming so fast, that the consumer is unable to judge the true impact of the changes and is left speculating within a churning rumor stream. Folks always react negatively to change - the basic Luddite psychology, and need to realize that the current diesel arena is an integrated whole involving engine design, fuel, lubricating oil and engine control technologies, the first time this all happend at once at every level. Yes, I believe you are also right in that the reason they are doing this is to advance the use of diesel engines with their better performance using biosynthetic fuels. Provided, of course, that a few folks don't derail the program or cause those irrational bureaucrats to divert their attention to dealing with pollution vandals, where we all loose.

1. Equate logic with enviromentalism or governmental thinking...
:funnypost The onslaught of campaign ads lately demonstrates that

The real solution is a revolution, but really - do you think that's going to happen with this estrogen saturated population of pierced faced wimps?
:lol:


Easy now... some of us pierced facers don't happen to be wimps(some of us pierced facers have things besides our faces peirced). Some of us like the D-Max so much they go out and buy one for their dad. One thing I can absolutely gaurantee you. If you think the Government and Auto manfacturers have the best and brightest IT folks working for them, then please give me a call I a peanut with the Virgin Mary on it that I would like to sell you, cheap only 100k.

As long as there are laws and rules and regulation, someone will find a way around them. Those little computers in your truck are not as bright as you think they are. Just becuase someone comes to you and speaks a foriegn language doesnt mean they have you beat, it just means you don't speak the lingo. There is not a single lin of code in the world that cannot be broken... Remember it may be a computer, but a human programmed it.

However I see the rules in a different light. They are gearing up the country to have more diesel vehicles. With the money that the government has dumped in US automanufacturing its not going to cut the balls off one the more profitable aspects of US automanufacturing. Maybe they will...it is the government.

But fear not, if there is a will there is a way. Everyone I know if California has an 'illegal' truck, but no one has managed to get in trouble for it yet.

Cat doses after turbo but there using A spark plug (yes a spark plug) to light off the dpf. The spark plug fouls out at 5k miles. Cat will not be making the 07 dead line as far as I heard and will take the fine and push it towards every engine. We have had Cats get to hot when regening the dash in the cab metled....
Detroit is dosing after turbo in the "down pipe"
uses an injector that opens at like 35 psi and doses fuel onto the DPF the dpf heats up to abot 1500 degrees.
turbo temps remain the same. Dmax is the same.
but back psi has a lot to do with it.
Cummins is alot like Detroit we share many of the same logic.

We had GM and Cat Volvo and others in our shops to evaluate.

Now 2010 will bring urea. this will be fun...

Yeah, some of you guys know diesels, and some of you really go off the deep end on macho braggadocio, and some are just too young to know better, but I know bureaucrats. Bureaucrats and enviro-nazis are pointy-headed scrawny little nitpickers that absolutely hate everything we do, especially if it has any hint of testosterone involved. They hate beer, guns, fat, frying in fat, killing things with guns and frying the meat in fat, tobacco, smoking (my gosh you'd think it was radioactive. Al Gore says smoking causes global warming!), why they even hate the prescription drugs you take because when you go pee-pee the stuff gets into the water and makes the little fishies change sex! Now these guys have already decided that the new diesel trucks will eventually be made foolproof so that if you tamper with the emissions system the ECM will immediately incapacitate the vehicle. Beyond that, I suspect that the nutered ones in Birkenstocks, will place restrictions on clearing the codes and restoring the vehicle to operation. Moreover, if enough folks violate the emission rules, I suspect the pinheads will simply place a need requirement on the sale of light diesel trucks, selling them for commercial use only, or place exorbitant licensing fees and extra "environmental" taxes on them. Then will come mandatory inspections and "spot" roadside inspections paid for by the special taxes. The final step would be the outright ban on the sale of light diesel trucks or engines. Remember, the pinheads lay awake at night and gather in seminars dreaming up ways to screw with you! The real solution is a revolution, but really - do you think that's going to happen with this estrogen saturated population of pierced faced wimps?
:lol:if you keep it to three lines or less we will actually read it :exactly:

if you keep it to three lines or less we will actually read it :exactly:



Hahaha.

:lol:

if you keep it to three lines or less we will actually read it :exactly:

Yes indeedie, it sounds like some folks have snorted too many lines of another kind there by loosing their attention span so they can't discern the validity of argument, or the sting of witty satire! Gosh, the way you guys get so excited, why I'd think you got one of your piercings caught in your zipper! There that's three lines or less. :lol:

Yes indeedie, it sounds like some folks have snorted too many lines of another kind there by loosing their attention span so they can't discern the validity of argument, or the sting of witty satire! Gosh, the way you guys get so excited, why I'd think you got one of your piercings caught in your zipper! There that's three lines or less. :lol::beerchug: