Quote:
Originally Posted by CanadianDriver
so if the twin turbo (N54) is better than the twin scroll (N55)...
- why was N54 discontinued on the 335?
- why did bmw make the N20 twin scroll instead of twin turbo? lag?
- has the HPFP reliability on twin turbos been resolved?
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1. N54 is probably more expensive than the N55. Most people think the change over was for no other reason than cost.
2. N20 is 4 cylinder. Germans are drawn to over-engineering, but I would think putting two turbos on a 2.0L four pot is too much even for them.
3. HPFP issue should have nothing to do with the number of turbos.