 6000RPM and the torque is falling off quick. 1st gear has a ratio of 3.214:1
2nd is 1.925:1
(FSM MT-34) With a differential ratio of 4.08:1, the final drive ratio is
1st gear: 13.11:1
2nd gear: 7.854:1 If you compare the actual torque to the wheels over those ranges of RPM you get the following: 1st gear: (13.11:1)
5500RPM: (~180 ft/lbs): 2360ft/lbs at the wheel
6000RPM: (~180 ft/lbs): 2360ft/lbs at the wheel
7000RPM: (~150 ft/lbs): 1967ft/lbs at the wheel
7400RPM: (~135 ft/lbs): 1769ft/lbs at the wheel 2nd gear: (7.854:1)
5500RPM: (180 ft/lbs): 1414ft/lbs at the wheel
6000RPM: (180 ft/lbs): 1414ft/lbs at the wheel
7000RPM: (150ft/lbs): 1178ft/lbs at the wheel
7400RPM: (135ft/lbs): 1060ft/lbs at the wheel As you can see, if you hold 1st gear to 7400RPM, even with only ~135ft/lbs of torque at the engine, that still produces 1769ft/lbs of torque at the wheel. This is still far more than any RPM of 2nd gear will be able to produce. Since torque is the driving force getting you off the line, it is advantageous to run 1st gear out to redline. There are other effects that come into play further down the track though since you are covering far more distance per stroke of the engine. Horsepower becomes your friend the closer to the 1320' that you get, but torque always wins at the launch. Just my $.02 understanding of the subject..
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