Quote:
Originally Posted by darkrom
You didn't answer my question though. Does the N55 motor need to be opened/built to handle the 500+ HP that you can get easily with the N54?
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Yes, it does. I've been told now by three German tuners this(Tuning Werke / Mannhart Racing / MS Tuning). The N55 can only handle ~360 PS on the internal engine components. higher than that and you will need to start beefing things up.
I've also heard that the N54 was originally designed for 380 PS for use in the Z4 sDrive 3.5is but BMW's board nix'd that idea. I guess that was back when a Z4M model was being considered. Instead we got a badge and trim package'd Z4 in VO.
