Tell you what slimjim, I played Gran Turismo on the PS3 before going to the real Nürburgring, and let me tell you, no matter how much you play it virtually, it doesn't prepare you other than what direction the next turn goes.
The sensation of speed, g-force and fear are vital sensations that are missing from the game versions of the track.
I remember going OMG! OMG! OMG! when I thought I'd overdone it while entering a corner too fast (damp track) but ESP saved my ass.