I am new to diesels. The more I read about the DPF and how it functions, the more it concerns me.

While the concept seems great for the environment, the increasing exhaust back pressure until the regen cycle and the excessive dumping of raw fuel into the engine can't be good for efficiency, and the fuel getting into the oil is clearly not a positive attribute.

I wouldn't do a delete on my 2015 6.7, but can't help but wonder what it would do. I certainly do not like the clouds of black smoke from the exhaust I see on you-tube on many trucks, but suspect they have done a lot more than a simple DPF delete.

Just wondering how much difference would it make if one simply removed the DPF without or with an appropriate tune. Would there be much smoke? How much difference in fuel economy? Any other negatives than environmental, initial expense, warranty void, and the fact that it is illegal?

In other words how much harm would it do vs how much positive?

 

removing the system will not make the truck blow smoke when you give it throttle, the system traps the particles and then regen burns it off. It is against the law to remove these systems now but there are thousands of people around the USA who do it and never have an issue. If i were to buy a new diesel I would remove the system....

 

It is illegal to remove or alter it. I have no idea about the delete kits for Fords, but I do know that two manufacturers of delete kits for Dodge trucks got into trouble.
You definitely can't just remove the stuff from the truck- the ECM needs to either know, or think, that it is still in tact for the engine to run.

I also know that there are many who believe that it isn't wrong to delete the diesels. I'm not bringing this up to be a conscience, just stating the facts of the law. Any alteration to the emissions system is illegal. That's why the delete kits that are available are only for off-road use. I have mixed feelings about it- dumping raw fuel into the exhaust stream, reduced fuel mileage, making oil in the engine, the heavy soot in the oil when you go to change it- it is robbing Peter to pay Paul, enviroment-wise.
Saying that, altering the emissions system is a risk that you have to be willing to take. Tighter inspections, data transmission or emissions status, etc. will make it impossible to run deletes and get away with it.

 

I just talked to somebody yesterday about his removal of the entire DPF system - urea tank and all - on his 2014 F350 6.7L dually. He also chipped his truck. He says he's now got over 8,000 miles on the truck running it that way and is seeing mileage on the freeway ranging between 21 to 23 mpg. Though all this sounds great at face value, I'm not sure how he gets away with that here in Ca. The truck is required to undergo a smog "inspection" (not testing) every couple of years where they have to ensure that all the smog gear is still present and working. As such, I'm thinking that this particular truck will not pass. Aside from what that will presumably do to his warranty... But then again, this guy is a gear head and would likely be able to fix most anything on his truck himself anyway.

 

Likely is truck has 3.31 gears.


You have to tune the truck or removing the DPF will cause problems.


Also if you run the truck right the DPF does not cause a bunch of issues.


Regular oil changes and good fuel help. 6.7 is designed to work and if you are working it hard then passive regens are the norm.

 

4.30 gears. He stated that with his larger tires (35's) he's running 1,800 rpm going 65 mph down the freeway. I have no knowledge or proof to the contrary and only just met the guy, so take all of this with a grain of salt. Personally, on my 2012 F450, I'd be happy to see 13 mpg on the freeway.


Cheers!

 

this new emissions is CRAP! Because we live in the good ol USA we have to have this junk on our vehicles destroying our MPG, dumping raw diesel into the engine oil etc?????????? Well WHY? if i go to Canada or South America or any other place other than the USA they are burning and putting emissions out like its nothing, so WHY? Because its all about the ol mighty dollar in this flippin country. Money for this to make people spend more money on this so other people have money, big flippin circle. Funny how people BELIEVE cuz the USA has all these new green politics and these new emissions laws etc that were saving the world....... but leave the USA and its like the 1950 all over the world. People are so stupid

 

All that stuff is off my 6.7. H&s makes some great tunes, I can set my tuner to have practically no smoke. I did see an increase in mpgs, I have less sensors to worry about going bad, my truck isn't sucking its own exhaust gas back through.

Having said that, it seems the 6.7 emissions are pretty reliable, egr is much smaller compared to the 6.4...

 

Modern diesel emission standards are all about how much emissions come out of the end of the tail pipe DURING the test. There are no laws about the total emissions released during the life of the vehicle.

 

Not sure about the testing requirements in Canada, but here in CA, manufacturers have emission standards for diesel engines they have to meet. There is no actual consumer testing of diesel emissions as there is for gas engines AFAIK. The diesel "smog check" is literally limited to a visual inspection of the various OEM components that regulate the emissions. Therefore, a vehicle that had it's EGR components etc. removed should not be able to pass that bi-annual "smog check" inspection.

 

I was talking about OEM testing where Canada uses similar standards for most things emissions or crash. And like I said the testing is done under specific perimeters at the end of the tail pipe not inside. There is no testing done during regeneration cycles
The only actual consumer testing in Canada is done in the Greater Vancouver Region of British Columbia but will be ending at the end of the year. It actually tests the particulate output of diesels under 5000KG GVW.

 

Please note, urea and DPF are part of two totally separate emissions systems.

DPF - Diesel Particulate Filter (Exactly as it sounds)
DEF - Diesel Exhaust Fluid (This is where the urea tank comes into play, and its not really a urea tank, its a DEF tank.)

I am not going to argue with you, since you seem pretty set in your ways. But there is a lot more to it than that. Sure you could go into South America, but if they had as many vehicles as we did, you probably wouldnt be breathing so well.

DEF and DPF work at keeping the air clean. At what cost is what is up for debate.

I support DEF. It works. Well.
DPF on the other hand...

Diesels that fall under the CA Smog laws (1998+ and less than 14000GVW) are required to submit to a test that checks for too much smoke on acceleration, called a "snap test" there are parameters, and some smoke is acceptable.

 

Don't worry about the DPF and SCR systems. The '08-'10 trucks were the first generation Super Duties to have the DPF, and there were issues that many were never happy with. Oil contamination was relatively common, and stock fuel economy was terrible. My '08 F250 with 3.73 gears would almost never get more than 15 MPG on the highway at 65 MPH.

But the 6.7L engine applied a lot of lessons from the 6.4L and most of these consequences were mitigated. The SCR system now uses DEF to control NOx instead of the huge amounts of EGR that the 6.4L used. This increases efficiency and permits the injection timing to be advanced and yields huge efficiency gains. I don't doubt Brett has seen a small increase in efficiency with his deletes, but that increase is nowhere near what the 6.4L engines saw with the same mods. My 2011 F350 would exceed 20 MPG on the highway in the same conditions my '08 would get 15. Yeah, it's a huge improvement.

Emissions controls aren't the handicap that they once were, and like Trey said above there is a reason for them. I was never happy with the efficiency of my 6.4L truck, but it's rare to see the 6.7L disappoint.

 

I didn't even touch on egr like tom did.
Egr adorns the bottom of my list of favorite emissions systems.