I think there could be one of 2 explanations:
Originally Posted by agraham2252
Just a late note on this tread. The website now lists the difference between the 550i and 550GT engine.
4.4-liter BMW TwinPower Turbo V-8, 32-valve 400-hp engine. Combines two turbochargers with variable valve control (Double-VANOS and Valvetronic) and high-precision direct injection
4.4-liter, 32-valve 445-hp V-8 engine with TwinPower Turbo technology, piezo direct fuel injection, 4 overhead camshafts, and Double-VANOS steplessly variable valve timing
I guess that I am confused. How many camshafts does the N63 have? Would the piezo direct fuel injection have that much effect?
1) the 550i engine is identical but detuned.
2) the 550i does not have twin scroll turbo chargers.
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