THe N55 has a higher peak torque because of the bigger single twisted turbo and drops its power at the end of the rev band sooner. The N54 stays consistent all the way through. Check out the 335is compare to both however!
Bigger dyno images go here so you don't have to click:
Full source article:
Video of the dyno run also in the source link!
Also note that there is engine variance and the driver that comes into play. Someone launched a half second faster or one had stick and the other had auto, or one was in sport mode and the other was in auto. Someone cheated and had software tuned where other was stock. Never know.
Originally Posted by gian p.r.
I have an n54 and race a n55 and its faster!