Yep, here on the Forza site you can check your lap times. If you go to Hot Lap->Class A->{Real World or Original Track for Penninsula}->pick the track and you will see your best lap time for that track in a car from that class. So unless you have recorded a better time with a different A class car than the lap you just did in the Ferrari will show up. It will even show what assists were used when the time was set. ;-)