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This S3tu engine is running 4 separate reverse flow exhaust manifolds for the 2 (twin scroll) turbos. (and yes the turbos could be used on an n54 given it was equipped with the right manifold/s, they are already working on the next n54 twin/twin scroll replacement) Using a HDE/DI fuel injection system, with solenoid controlled, multi-hole injector nozzles now, (homogenized mixture control) allows them to run much higher boost pressures, and compression ratios, based on the fact that their system completely atomizes the fuel in the combustion chamber @ up to 200bar before even being ignited. A higher compression ratio alone, will reduce the perceived "lag" on throttle. Direct injection removes the "lag" between the time it took for fuel to inject into the intake port, travel passed the valves, into the chamber, and finally introduced to the combustion process. Not to mention that fuel was never completely vaporized, and it would "stick" to the valves, and the chamber. Cutting down efficiency. Fuel Evaporation allows a cooler more dense air charge. Every 10 degrees drop in temps is a 1% increase in Hp. Homogenized control, meaning the mixture is evenly distributed throughout the combustion chamber. This is valvetronic III. These motors are brushless, and they are hidden below the head cover, and oil cooled. The air speed in and out of the chamber is even more tightly controlled. Everything in and on this engine is computer controlled, not just monitored. Even the oil pump flow rate is computer controlled. This cylinder head design, is superior to the 1st gen S63. And the engine as a whole, is worlds apart from the outgoing S85. (not to say its a poorly designed engine, lol! BMW PTG can make 800+hp on a naturally aspirated S85 ) This engine is just doing so much more to move more air, and more (or less) fuel, to make power twice as efficiently as that engine. Actually as far as volumetric efficiency is concerned, its probably running at an average of 75-85% of its max potential volumetric efficiency. Depending on conditions. Whereas the S85 was sitting around 40-60%! BMW builds the most ridiculous engines, then dials their output down to 5' before selling it to us civilians! Their capabilities are always underrated!
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