View Single Post
      12-01-2012, 05:12 PM   #22
claykin
Brigadier General
United_States
1579
Rep
4,545
Posts

Drives: various BMW
Join Date: Nov 2009
Location: Florida

iTrader: (0)

I've been told my BMW mechanics to think of the N55 as a cost reduced version of the N54. BMW simplified the design, cut out some of the high end components (i.e. piezo fuel injectors, dual independent turbos) and traded off raw performance for ability to better control fuel consumption.

N55 still uses HPFP, but design has been improved. N54's with latest HPFP should no longer experience high failure rates. My E90 MSport is still on its original fuel pump. The 2010 DME reprogram is said to address this issue.
Appreciate 0