Quote:
Originally Posted by Zebra99
I'm almost certain all IS engines are N54 regardless of year.
I know for certain in the 335is they are still n54's, but I guess it's possible on the z4's this isn't the case...doesn't seem likely though that BMW would use an N55 with PPK here considering they don't make that power anyways.
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335is does use the N54 but the 135is does use the N55 + power kit. It's interesting to me that the N54 "is" cars (z4 and 3 series) have "overboost" (which is a lie, you almost always have overboost so they may as well just say the car makes 369lb/ft unless it starts to heat soak or unless you floor it for over seven seconds without changing gears). The N55 "is" cars and the M135i/M235i don't have overboost and only make 332lb/ft, I wonder why that is.
The posts saying the z4 35is switched to an N55 are news to me, I didn't know that but until last year they were using the N54.