Diesel hypermileing

[JCL]

Originally Posted by diesaroo

Removing the DPF and other emissions hardware (EGR) might not be "environmentally friendly" or legal, but it does simplify things and theoretically will reduce the amount of possible engine failure modes down the line.

I don't agree that removing the DPF and emissions hardware would simplify things. Building an engine without them in the first place, would, yes. But that isn't possible. These engines have integrated engine management strategies, you can't just remove a system and not expect the engine management system to notice. I think that butchering the software will provide additional failure modes, and add risk beyond any theoretical reliability improvements due to removal of hardware.

The EPA was very concerned that if they allowed diesels with urea, owners would tamper with them and nullify the emissions controls. It delayed the introduction of clean diesels by several years. As a result, there are tamper indicators built in, since the manufacturer had to provide assurance that the controls would still function for 100,000 miles.

I think it would be funny if someone did remove hardware, and was tested in a few years and failed. I have never re-installed emissions controls on a diesel, but I did it years back on customer gasoline-fueled vehicles that had the emissions controls removed, and subsequently failed tests. Very expensive for the owners.