Originally Posted by German Engineering
Doesn't the N55 have less turbo lag? If you compare the N55 and N54 both with 306hp, the N55 has max torque available already at 1200rpm (100rpm sooner). Isn't the purpuse of twin scroll tubines to make less lag?
In real life driving conditions you never can reach those max torque levels at those rpms. You need to be pushing the car in the sixth gear at 1200 rpm for that. Those numbers do not really give you an understanding of either the throttle response or the turbo lag of the two engines.
The bottom line is the reason for passing from N54 to N55 or from a twin turbo set up to twin scroll single turbo set up was mainly due to achieve better efficiency, not more performance.