I would suspect the OEM oil pump gears gave up the ghost.
If you are building an engine.. And not going dry sump (which is high recommended) you at least need to have the Nismo oil pump gear set installed.
Also lots of loooong corners...without oil pressure logging... Just a guess but long sustained corners is not good for OEM oil pump.... And again the oem oil pump gears are not really designed for tracking.
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