Quote:
Originally Posted by BimmerEngineer
The N55 had a much broader power band, much more linear from idle to redline, whereas the N54 based twin turbo in the former pre-2011 135/335/535, runout of steam above 5500 rpm. The N55 didn't have serious issues with the HPFP like N54.
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What are you talking about? Where do people come up with this stuff?
The N54 and N55 have torque and power curves that are remarkably similar. The N54 had/has much better tuning options. Yes, the N54 had HPFP issues, but that was resolved by a change in fuel pump part, not the N55 engine design.
The N54 vs N55 stuff is ridiculous. They're very extremely similar engines. The N54 had some better internal components, but in stock trim, I'd challenge anyone to tell them apart in a blind test.
None of this has anything to do with the engine that will be delivered in the M2, because BMW has the resources required to tune the engine to whatever characteristics they like.