well couple of days back i also did some flying laps of the Tsukuba circuit( full circuit).
the results:
Honda Nsx-R GT 00:55:013. performance index 754, it's fully upgraded.
Honda Nsx-R 00:55:158. PI is b/w 715-720 don't remember the exact 1.
Ferrari F430 fully upgraded did it in 00:55:624. PI is arnd 735
Acura Nsx 00:56:145
btw did more laps with diff. jdms but don't remember the times.