G27 and assetto corsa

I need help. okay so when I play assetto corsa with my g27 wheel the wheel in the game and in real life don't match up. I turned on the debug menu and when I do it says im turning my wheel 240 degrees when im actually turning it only 90 degrees. can u guys help? I really like my new wheel but I cant get it to work properly with the game. ive tried everything. I put the preset, the stearing wizard. and it does work.