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I have a question, how come the S63Tu unit in the F10/12 M5/6 has to run boost at 1.5 bar (~21.8 PSI) compared to the S63 units in the E70 X5/6 M at 1.2 bar (17.4 PSI) to generate pretty much the same power, 560hp vs. 555hp and exact same torque @501 lb-ft....I know the power and torque curves are slightly different but that's a lot more boost for basically no increase in power.
Maximum Boost Pressure (absolute)
1.5 bar to 1.2 bar
Output 560hp to 555hp
@ 5,750 – 7,000 to rpm 6,000 rpm
Torque 501 lb-ft to 501 lb-ft
@ 1,500 – 5,750 rpm to 1,500 – 5,650 rpm
I understand that the Tu is far superior but this strikes me as strange...unless "absolute" means that the motor has the potential to generate that much boost but never actually does.
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