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Old 06-05-2013, 10:48 AM   #1
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Default HPI sprint 2 with 9T motor

Hey guys I am new to the hobby and I recently installed a 9T brushless motor in the car.

Gearing is the stock 23Pinion and 90Spur.

Issue I have is the car is not making the motor work to its potential. It's slow to take off and takes long to get up there.


Wondering what gearing I should run. I am new and still somewhat confused about the pinion and spur ratios but would like to learn.


Also what's the difference between 48 pitch and 64pitch gears??


thank you
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Old 06-07-2013, 08:17 AM   #2
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anyone?
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Old 06-07-2013, 08:49 AM   #3
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With that gear ratio, 90/23 x 2.13= 8.33 FDR (2.13 is a sprint2's internal ratio), it shouldn't really be slow accelerating. Maybe there is some resistance in the drivetrain. Bad bearing, belts rubbing on the motor or the battery, etc. If you disconnect the motor(loosen the screws and drop the motor down so the pinion isn't touching the spur), does everything spin nice and freely? Does the motor get really hot, quickly.

You can try a smaller pinion. It should help improve acceleration, but I suspect there is some other issue going on here.

48p gears have larger teeth than 64p. 48p won't strip as easy as 64p, but doesn't allow for as fine adjustments to the gear ratio.
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