Su-57 intakes, supercruise performance and 2nd stage engine

[Scorpion82]

It depends on the SFC of each engine at the required power setting for that flight condition. Engines typically have their best SFC at around 80-90% of Mil power, and it gets worse above and below that SFC bucket. The higher thrust engine may be operating below that optimum power setting.

On the other hand, the higher thrust engine, operated at its optimum cruise SFC may allow the cruise to at a higher altitude, which lowers available thrust and fuel flow, resulting in lower actual fuel burn. There are a lot of variables in the equation…..

Indeed. Just wanted to point out that static SFC isn't the complete picture.