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Jotech's Kenny Tran started the M4 programming with a map from his racecar. "The big difference was converting from methanol, which burns cooler and therefore takes more volume to make power, to gasoline. Spool-up time for the turbo was also a concern because the turbo's behavior with the two different fuels was night and day. I am really happy with how it came out; we tuned the car in 15 passes."