I didn't play Forza, but I have 'almost' memorized the track on GT4.adwebinc said:
I have driven on the real 'Ring the first time a few weeks ago. Believe me, after the second corner you are forgetting everything you have learned in the game
Do not forget that you are not driving against the clock, the Nordschleife (North Loop), as it is actually called, is an experience. You are there to enjoy the course, not to win. You won't get a prize at the end, but you'll have a bigass grin on your face once you completed your lap.
Read the link below:
http://www.nurburgring.org.uk/
It's a great source of information and it's in english language.
Do not forget one thing ; Respect the Ring, do not overestimate yourself. Once you left the gate, remember how much attention you paid when you first drove a car in your life, and drive like you did on that very first day.
Yes, you'll be able to drive on the 'Ring.