N55 and lag: Still a turbo..
See picture 4 and peters's comment when scrolling down
http://www.bimmertoday.de/2009/07/15...ang-automatik/
Unfortunately the conditions (e.g. engine speed) to reach max. torque within 2.5 seconds was not stated. Anyway, official proof from BMW for turbo lag at least in the lower areas. Nowadays such graphs would never be off. published anymore..
Sorry is in German but graphs are speeking for themselves (base N55 with max. torque of 400Nm / stated when N55 was introduced in 2009)