Im truly hoping there will be a sticky about setting up the G27 for AC.
Pfff...okay here we go. Yesterday everything worked out well for me. Within the profiler i set 271 degrees rotation and game adjustment not(!) ticked. In game AC adapted to the 270 degrees rotation and i was able to drive all cars with this rotation.
Today however out of the blue (nothing changed) AC does not adapt to the 270 degrees anymore. Suddenly in game it follows its own 900 degrees. So when i turn the G27 to its max (135 degrees) left or right, ingame the steering wheel rotates 450 degrees which result in oversteer as soon as i turn the g27 a little and it is impossible to stay on track. This was solved by unticking the profiler option: allow game adjustments. However, somehow AC does not recognize this setting anymore. I unplugged the G27, deinstalled the profiler, restarted the PC, reinstalled the profiler, set all options and tried again = no go.
Im a hardcore PC gamer but sometimes a truly grave for a console...simple plug and play.