Real Racing is Firemint’s 3D racing game, which puts you in the driver’s seat as you carom around tracks in three different classes of automobile. Right now, the game is limited to six on-screen cars at a time, but Firemint’s tech demo shows the iPhone 3GS with up to 40 cars on-screen at once.

“Since the game uses a high fidelity physics engine, adding cars is a good test for pushing the hardware. We started our tech demo with 8 cars on the track, then 10, 12, 16 and 20, and the 3GS still didn’t break a sweat,” wrote Firemint’s Alexandra Peters. “We finally stopped when we got to 40 cars on the track at the same time, still with no perceptible drop in frame rate. We think the results are mind blowing.”