[Len_Beach]

Originally Posted by floydarogers

Whoa, didn't catch this when you posted it. The USA/CA 335d has an M57. The first applications of the N57 was the F10 5 series (in 2013 or so) and the F15 X5 (2014).

The N57 never featured in a 335d. They were all variations of the twin turbo N57.

Originally Posted by floydarogers

Not sure if everyone asking about N57 knows, but the USA/CA N57 is quite different than the 2009-2011 E90 335d and E70 X5d, which had the M57 engine. The M57 uses a twin-turbo sequential setup, while the N57 has a single non-sequential setup. That requires a different downpipe. Also, for the EU/UK guys, all USA/CA cars had a different EGR, DPF (DOC) and all have SCR/DEF. And those cars all have electronic/electrical controls rather than the vacuum system operating the EGR and other stuff.

The newer DDE tested on the E90/E70 USA cars has to be bench-flashed (cannot be flashed in the car) to remove all the OBD/CES checks to pass emissions (no-one does sniff tests on diesels, so "all" you need to do is to get a tune.) (If you search you'll find 2-3 names of people doing them.) You cannot code out those checks; a tune is required.

However, dieselgate has sharpened the EPA's interest in enforcing things, and there are no shops advertising their services in this regard, as none of them want the $25K-$50K fine. One in particular stopped doing tunes while they got some procedures in place: you MUST sign a waiver saying it's for off-road use.

One final thing: there were only around 10K E90 335d imported to the USA/CA. There are more X5d's, not sure how many. The F10 535d and F15 X5d probably have sold less numbers. So it's a small market and not really worth it for shops to risk big fines and to design and manufacture the dp's and do the tune.

The N57 uses the Bosch EDC17 which is the same as the US 335d. The EGR etc is also electronically controlled, the similarities with the US 335d are greater than they are to the EU 335d.