According to Greenawalt, Automagic is accurate enough that it has actually revealed flaws in real-world cars. One of those cars, he claims, is the Ferrari Enzo. Turn 10 modeled the Enzo shortly after its introduction — and before anyone outside Ferrari had driven it — using data obtained from Maranello. When the car was loaded into the game, its chassis balance was supposedly nightmarish, a mix of low-speed understeer and snap oversteer. "It didn't work below [triple-digit speeds]," Greenawalt says. "We thought, 'This is the Enzo — it can't be this bad.' We just assumed our math model was wrong." Shortly thereafter, several major car magazines drove the car and commented at length on its flawed handling. Greenawalt was nothing if not relieved.
You can read the full article at http://jalopnik.com/5480781/ and there's also links to part 1 and 2 in there