Quote:
Originally Posted by CaryTheLabelGuy
Ehh. BMW marketing, maybe.
Look, the S55 and N55 are very different engines, particularly when it comes to tuning, which is what is stopping the S55 from going single turbo.
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As already stated, the actual hardware differences going from the N to the S55 aren't that great. The block is closed deck, the rotational assembly is beefier, there are two turbos, and an AWIC, but in essence it's very similar to the N55...which is exactly what BMW has said. The days of a completely unique engine to the M cars has come and gone...BMW specifically mentioned this when the F8X was being released.
As far as tuning goes, they are nearly identical, lol. There's a reason that Terry had the JB4 integration along with the in-dash control system up and running in nearly no time once the F8X was release, and it's because the ECU, from a manipulation standpoint, is the same. The tuning (accounting for differences in hardware, etc) is very similar. Heck, it uses the same CAN commands as any other N55 3 series.