OK, I think I understand you. Some of the power consumed by the MGU-H does contribute to the crank power, it’s an interesting question as to how much contribution it makes.godlameroso wrote: ↑Thu Jul 16, 2020 6:36 pmNo, the MGU-H does contribute. Powering the turbo takes energy from the crankshaft. Remember that the turbine is an obstruction at the end of the exhaust runners. That obstruction creates backpressure adding pumping losses to the crankshaft. Those pumping losses are working against the crankshaft robbing it of power. By removing that pumping loss with the MGU-H, the power lost driving the turbine returns to the crankshaft.henry wrote: ↑Thu Jul 16, 2020 1:42 pmI think you meant to say “ICE + MGU-K“.
I think that in the max power mode the MGU-H is a consumer of power not contributor. The ICE is supercharged with the the compressor driven by the MGU-H (electrical Energy from the ES) and the turbine (kinetic Energy from the exhaust).
Depending on LHV of the fuel this puts the ICE crank power (890hp) at around 50-52% of the energy available in the fuel. Since the compressor is driven in part by an external source this is not the same as the ICE efficiency.
A belt driven super charger and exhaust gas driver super charger both impart a parasitic load on the engine reducing it's true potential. There's no such thing as a free lunch in physics. Using the power of the MGU-H reduces this parasitic drag, therefore we can think of the MGU-H as adding power to the crankshaft, just not directly. Because it's not direct there's some inefficiency in the energy conversion, so 100hp from the MGU-H doesn't necessarily equal to 100hp extra at the crank. You can get closer if you improve the efficiency in your energy conversion, IE the MGU-H can add more power to the crank if you have a less efficient turbine that robs the engine of more power in all circumstances.
In your description of the what happens in max power (supercharge) mode I think you’re saying that the MGU-H motors the turbine and so reduces exhaust back pressure. I don’t think that’s the case. The back pressure is reduced by opening the wastegate and the turbine continues to drive the compressor using kinetic energy from blowdown but at a reduced power. The shortfall Is made up by the MGU-H also driving the compressor. I think the shortfall is around 80kW. Because of the reduced back pressure the ICE output goes up by maybe 30 or 40kW. I think your argument is that the MGU-H is providing 80kW even though the crank power only goes up 40kW.
An interesting way of looking at it, although your ICE+MGU-H equation only works for an ICE power level that can never exist.