Quote:
Originally Posted by LMK5
Absolutely. I do suspect that BMW changed (or revised) the turbocharger when switching from the N20 to the B48 engine as part of their constant cost cutting. When I first drove the 330i with the B48, the first thing I noticed was they tuned the drivetrain so that the 1-2 shift is performed at higher RPM than the N20-fitted cars, presumably to aid performance when equipped with the B48. This may be one of the reasons why the B48 is less fuel efficient.
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The turbo in B series engines are much larger than previous gen for more torque. N55 and N20 were using probably smallest turbos bmw ever used, which reduced lag.