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Limits to increased power
The alleged limitation to extracting more power out of the S63Tu is the crankshaft. In it`s current forged steel form, it won`t be able to handle much more torque. With time and economies of scale from dissemination of the engine to future X5/6Ms, M6, M6 Grand Coupe, BMW M may upgrade the crankshaft to allow unleashing the full power the engine is capable of.
It is tuned to obtain 30 percent improvement in economy over the S63, which may imply that by tuning it for power, it may be able to reach 700 hp. Let`s keep praying for a BMW supercar. It`s beyond time for that.
Cheers
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