Anyone compared their lap times against real life times at the Nordschleife? I did it in both GT4 and Enthusia. I see it as a small realism test for the game aswell. In GT4 I was usually alot faster than real life times, in Enthusia a little faster. In Forza 2 I'm a little slower than real life times, atleast at the moment 
It's difficult to say what's official times, but I think the german car magazine Sport Auto ( http://www.sportauto-online.de/ ) is a good source, since they should be an objective source.
Here are a few selected times for those interested:
Aston Martin DB9 8.16 min 11/2004
Audi RS 4 8.09 min 06/2006
BMW M3 SMG 8.35 min 03/1997
Ford GT 7.52 min 02/2006
Honda S 2000 8.39 min 01/2000
Nissan 350 Z 8.26 min 10/2003
Porsche 996 GT3 7.54 min 06/2003
Porsche Cayman S 8.25 min 11/2006
Renault Clio Sport V6 8.49 min 07/2001
VW Golf GTI 8.53 min 11/2005
Good luck
It's difficult to say what's official times, but I think the german car magazine Sport Auto ( http://www.sportauto-online.de/ ) is a good source, since they should be an objective source.
Here are a few selected times for those interested:
Aston Martin DB9 8.16 min 11/2004
Audi RS 4 8.09 min 06/2006
BMW M3 SMG 8.35 min 03/1997
Ford GT 7.52 min 02/2006
Honda S 2000 8.39 min 01/2000
Nissan 350 Z 8.26 min 10/2003
Porsche 996 GT3 7.54 min 06/2003
Porsche Cayman S 8.25 min 11/2006
Renault Clio Sport V6 8.49 min 07/2001
VW Golf GTI 8.53 min 11/2005
Good luck