There are plenty of arcade style racing games for the iPhone, but they just don't provide you with enough playing time to make the experience different each time. If you're looking for something along the lines of a driving simulation game, then you'd want to check out Gameloft's GT Racing Motor Academy that takes racing on the iPhone to a new level. Much like what you find on popular console titles like Gran Turismo or Forza Motorsport, GT Racing Motor Academy places you into the seat of over 100 fully licensed vehicles across 25 real world car manufacturers – which is something unseen on any iPhone racing game. You can test drive over 100 cars in the game and enter a career mode with 6-player races which can be accomplished locally or online. There's definitely a lot of depth with this simulation based game – providing you with a serious mix of challenges that can keep you occupied for some time.