Dunno why they dont use 100% throttle for nominal power (1.32 Ata 2400 RPM) and 110% throttle for emergency power ( 1.42 Ata 2700 RPM).
For example Bf 109 G with DB605A had initialy blocked engine power only for nominal 1.3 Ata then in 1943 they unblocked it for emegergency power 1.42 Ata.
But other hand derated BMW 801 D still had emergency power ( it had just different power settings then full rated 801):
Derated BMW 801D
Nominal power - 1.28 Ata 2350 RPM
Emergency power - 1.35 Ata 2450 RPM
Full rated
Nominal power - 1.32 Ata 2400 RPM
Emergency power - 1.42 Ata 2700 RPM
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