With the time to speed test, you can choose any starting and ending speed, as well as a gear to start in. In this example, a clutch driven car launches at 4470 rpm for a 0-60 mph test. The starting rpm is updated anytime you change the starting speed, as well as the starting gear. Tire growth is also accounted for here.
As you can see on the right, this car really hustles. It's 0-60 mph time is 3.48 seconds. In this case, the car was actually capable of spinning it's tires all the way through first gear to 48 mph. See where it shifts into second gear? It slows down a little due to wind and rolling resistance for a brief period, then gets good traction with full throttle. To improve the 0-60 mph time this car would need better traction or a faster shift time. Perhaps a higher gear that prevents the 1st to 2nd gear shift will still improve the time if the traction issue is too expensive or impractical to solve. What do you think? The graph of this run is easily displayed by clicking the "View graph" button.