3D Racing Game Ideas

hi guys,
i need help on making a 3D racing Game. i have already made racing games using couple of different ways. like scrolling the road method and 7 Mode. But i need to put in more features in this particular game and also i want to make the graphics quality more better(than 7 Mode). So can somebody gimme some ideas and point me to something relevant. Fred Heintz mode 7 engine looks good, but the code is uncommented and i cant figure out whats going on in there, i know he is using bitMapData instead of MovieClip but i cant seem to understand it.