What RPM is best to launch at?
This is loaded question. Launching is highly dependant on variable conditions, such as track prep, tires, clutch condition, temperature, etc. In general, on street tires, there are two schools of thought on how to get the best times. The first is to use a standard street launch (off idle or slightly above) while simultaneously rolling on the throttle and slipping the clutch once traction is obtained. I have seen a best time of around 1.9 with this method. The second method is to rev the car to 3,000 or 3,500 RPM and quickly but carefully slip the clutch while rolling on the throttle in a controlled manner. Times as low as 1.6 on the stock Goodyear F1s have been reported using this method. Be aware, however, that this method may cause premature clutch failure. On DRs, a bit harder launch method can be used, though dumping the clutch will typically result in wheelspin/hop. With slicks, a dump at higher RPM (5,000 or so) might actually hook, but the chance of breakage will be more severe.
