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Originally Posted by maxxdude1234
One guy on the forums (can't remember his name) runs an 8XL on 20cells in his truck. He reckons the speeds are about 60mph. Personally I would reccomend the 9XL for this kind of voltage, as it will run a bit cooler and still push 50-55mph. With 4000mah lipos you should get 20-25minutes of runtime - maybe more/maybe less.
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I've got an excell spreadsheat to calculate speed in first gear and 2nd gear using stock tires and stock gearing on the truck with 15:49 pinion:spur.
24V on the 9XL motor is only good for 39MPH in second gear with an assumed 20% speed loss due to aerodynamics and driveline friction .....
8XL on the same setup is good for about 44MPH with an assumed 20% loss as well...