High RPM Issue on Dyno

Treblig said
It doesn't make sense??? If the fuel pressure/volume is insufficient at 6200RPM it would only be worse at 6600RPM. The demand for fuel is greater at 6600RPM so if the fuel system is supplying enough fuel at 6600RPM then it should be enough for all RPMs below 6600RPM using an electric fuel pump.
My 2 Cents.

Treblig
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that's why I asked if he made multiple runs
I could see a sudden drop in pressure causing this, then, as pressure builds up again the HP output comes back up

but that doesn't make sense with his multiple runs