Again? I thought you had this happen to you a while back? Or did you run another motor up high enough to lunch an oil pump? Next time put in a Nismo oil pump or trust the factory engineers who set the redline at 7500 to prevent exactly this from happening.
Edit- Yep, that's twice that 8100 rpm has kicked you in the wallet.
Z's moter breaks. Either build the motor to handle it or stop running it up that high.