Quote:
Originally Posted by VipinLJ
If the internals are the same, I don’t mind the “lower” 46 number  I was wondering if that was why my flash tune failed. Because I chose the B48 map and not B46. |
I would guess yes, in regards to why your flash didn't work, you chose the wrong engine.
The internals of the B46TU and B48TU are different (read the document from the link I posted, takes less than 10 minutes and is very clear).
That technical document may be specific for BMW North America. I assume there is still a possibility that non-USA 330i's receive the 'old' B46 (non TU), that doesn't have certain changes because of the lower emission standards outside of the USA. But, does this make sense for BMW to make two different B46's? Probably not, and all 2020 BMW 330i's USA and non-USA are running on the new B46TU engine.
The B48TU with upgraded internals is installed for other BMW and Mini cars that run 300+ HP and 330+ TQ. They should have just thrown that B48TU in the 330i and rated it at 302 HP and 332 TQ from factory, but I guess that would be too close to the M340i's numbers to justify people spending the extra $14k or so, although the extra 2 cylinders counts for more than just the additional HP and TQ in terms of drive-ability, BUT, it comes with a weight increase which is another rabbit hole. The 330i may have been just about perfect with the B48TU, 302 HP and 332 TQ from factory with the lower weight than the M340i.
Fun discussions.