I've always wondered how game companies intend to keep up with cars that are increasingly faster due to programming and not raw horsepower or raw grip. Right now they "cheat" and give it more mechanical grip than it would otherwise have, but cars like the LaFerrari, P1, and 918 all use their electric motors, brakes, hydraulic anti roll-bars, and e-Diffs to drastically improve performance beyond what they would otherwise be capable of.
Simulating all of that data is tough and the manufacturers would never share it anyways. We're getting closer to drive by wire cars that are like fighter jets, unstable and unusable when actually controlled directly by a human.