Originally Posted by Scapie4
Could you please elaborate what you mean by "having the DEF system turned off in the ECU"?
Would that mean we no longer get the P20EE code on?
Some programmers on other diesel platforms have just turned off the functionality of the EGR. It remains in place but remains in the closed position so the detrimental effects (soot build up, less power and efficiency) do not occur but you still look stock. The EGR functioning correctly also causes more soot production which results in more regens and more activity and chance for failure with the DPF.
A good solution for the average consumer that wants to remain consipicous would be the EGR and DEF system shut off but kept in place. The DPF would still be functional for soot and noise reduction. Personally I hate any amount of soot from my diesels as long as the DPF can be made reliable, I'd actually prefer the DPF to remain in place and functional. I had a 7.3 for years that could soot out an entire city block and I feel that was (very) selfish and immature of me.
Although there are lots of claims of how the emmisions equipment reduces mpg, with a program and EGR delete I just have not seen that to be the case personally with the newest diesels. I doubt any deletion kit could make my Eco-D actualy run better than it does now as it already runs so well and has such superior mpg to my pre-emissions/ deleted diesels.
Ultimately, diesels from about MY 2004-2012 been similiar to gasoline engines from the late 1970s. When gassers first began to get emissions they really were crap. Poor power and performance. About 3 years ago I dynoed a car with and without cats and the dang thing had a notably better powerband with the cats in place! It took many years but gassers have no problems due to their emissions systems any longer and in fact have never ran better.
Diesels just starting taking their lumps recently as they had been exempt from emissions for many years and got a late start. They have quickly improved. In another 5 years very few tuners or consumers will see the need or will even consider a full delete kit as it just won't be necessary.