I have made the Williams FW13 in some circuits but the textures are very polished, they reflect a lot. What causes this problem? From f1grafics, or the texture or material of the car? I have McLaren MP4/5b, Ferrari F1/90, Benetton B190, Tyrrell 020 and Lotus 102.
I think you need to delete the current alpha layers you have and create new ones. I had the same problem with some 2010 cars and solved it by making new alphas.