I'm pretty confident that with everything else being equal that an EFR8474 with 1.05 hotside would be all around equal or better running at 520kw than the RB28 with the EFR8374 and 1.45a/r hotside in the example above. Sometimes you need to go a bigger a/r to achieve what you're doing, whether it be that the whole setup works best there or sometimes just if you are pushing the turbo to the absolute limits and don't want to upgrade the rotating mass so going to a bigger a/r is a bandaid which is what imho has happened in a few situations that are used as evidence that "RBs like a big rear". RBs don't have a clue what is attached to their exhaust side, from the turbo's perspective its the dynamic of how fast the compressor needs to spin to pump the required air, intake manifold pressure required to achieve that and how efficient the compressor is at that point, and well the turbine/housing combo works at that point. Motive DVD share a lot of good info, and try their best to interpret and explain data well but there are plenty of times out there where the same data can look different depending on what you know and what you are looking for.
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