Recently purchased. Would like recommendations on tuning and removing emissions. Located in a state that does not test. Thanks.

 

Fixed it for ya.

 

Good luck, epa went after all the little guys (tuners) because they HATE HATE HATE personal diesel vehicles. Slapped all of them with 500k or 1mil dollar fines and shut em down. Gotta find one not on public forum or out of country. Good luck. They dont give two rats if a gas powered beast is spewing solid black smoke or burning a quart of oil a day but man if ya got a open pipe deisel they will try and bend ya.

Too add very few E250 diesels over here in the states, only couple of years I believe (I have a 14).

 

Not really, its all about money. Hence the reason many states have shut down the testing if they couldnt make enough profits off of it. Some states have a nice racket on it so they will probably keep it going.

 

I used to live in CA, who is leader in environmental protection, yet diesels have been historically exempt from smog checks.
Till about 10 years ago they were not and they grandfathered new law to older vehicles. At the time I drove 1998 E300 Turbo Diesel and after few years of registering it with no smog check, I had to start doing that.
From what I read, the change was mostly triggered by truck owners, who routinely would delete all emission systems to "run coal", but it backfired on Mercedes diesel owners as well.
In last years I do read about more and more states following CA sample.
Those things are subject to local laws and when I have to do annual smog checks in Las Vegas, the next county (30 miles away) doesn't have smog checks as its population is only few thousands.
Still just because you don't have checks, doesn't mean you will be legal as all states have very firm laws about removing smog equipment.
Meaning any more educated cop can stop you and send to referee.
Than you might want to move in next few years .....
I had DPF delete on my W212 due to fact that few years ago MB USA could not supply me with DPF, when my broke. Regardless lot of propaganda of better performance, the hollow pipe made no difference and I reversed the procedure last year to get benefits of Bluetec Settlement.
I record each fueling on fuelly and could not tell any difference this way, or the other.
But now with new DPF, I don't have black soot on rear of my car and I am not breathing it.

 

It shall remain stock then. Coming from a tuned W211 OM648 I am guessing I will not see comparable gains or improvements.

 

OM648 did not have SCR system, meaning it was much simpler to do and much simpler to hide.

 

WA state did away with most if not all of theres think it was last year. I lived in places that didnt require it but regardless it was costing state too much money "I mean according to our fearless overlord (inslee science and facts guy that does stick drawings while serving as governer of our glorious state) the program did its job and got our air quality where it needed to be so its no longer required".

Actually the laws are primarily federal hence epa gets involved in controlling you and your actions.

Your DPF delete tune which I assume removed the SCR and EGR as well, if it didnt then it wasnt a real tune but a hack job. A real tune will remove all that or make it inoperable (have to remove DPF and SCR physically). These do 3 things. Get rid of the extra fuel dump that allows the DPF to regen which equals fuel savings, free flows the DPF and SCR which removes requirement for DEF addition, stops EGR from sending that stuff back to the engine (hence your oil wont be black in 1000 miles after oil change), and it adds power which can/will reduce fuel mileage depending on how clean it is.

From what I have read in your past post you didnt remove the SCR which I dont see how that works properly but oh well.

These exhaust systems work like this - EGR sends crap back to engine, this causes poorer burn of fuel and causes more soot which a DPF is now needed to burn off, this extra soot burn which uses more fuel which causes more EGR to be sent back all contributes to more NOX gasses because deisel particulate is bad mmm k but NOX is way worse so all these things that creat more NOX needs to have it burned off so they install a SCR with DEF injection to handle that. In the end way cleaner than gas butttttt diesel bad so .......

 

EGR over the years become integrated part of engine management. I did not delete it, but then I never had troubles with it.
When I am not that picky about poisoning the atmosphere, for me bottom line was lack of any fuel saving with DPF delete. Than soot accumulation on car was pretty obvious.
DPF and SCR are completely separate system, doing complete different jobs.

 

Yeah seperate systems but they work together to meet emissions standards. The DPF comes first in exhaust then the SCR with DEF injection. Technically they are both part of the exhaust system so same system doing different jobs.

Just saying if your gonna get the minimal fuel savings from doing a delete then ya need to do the whole thing or not at all. The only advantage to keeping egr is quicker warmup times as that is when its usually most active. It is what causes the flapper valves intake and such to gunk up oh and your oil. When thats no longer there your intake is clean as can be, and your oil stays a decent amber color for a good portion of the OCI unless something else is leaking by.

Now older diesels that just run a DPF and CAT but no SCR they are the ones that saw a much better increase in MPG by deleting.

Regardless ya gotta go overseas where we get everything from and they dont have any EPA to get in the way to get a tune. Except underground they wiped out everything here.