Unfortunately that only works on Default Scanline Renderer.
Don't think the matt/shadow material support G.I. in Brazil and Mental Ray. It can only generate shadow from proper light, but not from illuminate material (i.e. lighting plane)
check the 1st pic FZR's front wing, i can see the curbs
2nd pic, the hood, most top point, i can see the guys feet. and the rear fender is transparent aswell, so it doesnt work for you