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Thread: Motor/gearing?

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Old 12-08-2014, 10:08 PM   #1
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Default Motor/gearing?

Hi I have a losi comp crawler with a 55t brushed motor what gearing should I run? I don't want to cook the motor either
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Old 12-09-2014, 12:59 AM   #2
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Default Re: Motor/gearing?

55t motors are not a good choice, to get any sort of wheelspeed, you're going to be running that thing at high throttle all the time. this builds heat and wears the brushes and comm, which generally ends poorly. you could try to up the pinion a bit to compensate, but this will again build heat in the motor. i've seen a couple 55t's go up on course, it was the same story with both of them. 15-17t pinion, and too long running under load.

in general, i would never reccommend the use of a 55t motor in a losi, there is just not enough speed in the motor to get through the reduction. remember these reduce at the axle, not the trans. for brushed, you can go with something like the traxxas 21t titan or a good rebuildable 35t. the titan is a throwaway can, but it will run a good long time. not the best, nor the worst. a good 35t from a builder like holmes hobbies or team brood will be a solid runner, but keep the runs short and take care of the motor after a day or 2 of running.

these trucks love brushless systems. in mine i run a tekin gen1 17.5t redline with a mamba max pro behind it. great setup, every couple years you'll have to replace bearings. there are a lot of motors that people use, and generally, they are sensored brushless with either a mamba max pro variant or tekin rs doing the control.
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Old 12-09-2014, 01:28 AM   #3
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Default Re: Motor/gearing?

Originally Posted by ghtpdm5 View Post
... the use of a 55t motor in a losi, there is just not enough speed in the motor to get through the reduction. ...
The (motor) speed is not an issue, the lack of power is.
The worm drives, as well as the dig forks, add friction to the drive line that use up quite a bit of motor power.

I think it's worth trying running a 55T motor on 3S to get that extra power with better efficiency than using a 35T motor.
Be cautious though. I've burnt two brushed motors myself.
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Old 12-09-2014, 02:09 AM   #4
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Default Re: Motor/gearing?

Good quality brushed motors are expensive... Depends on how much you have invested in the ESC, but you can find cheap sensored brushless systems for nearly the same price and have more power/speed.
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Old 12-09-2014, 12:35 PM   #5
Join Date: Mar 2012
Location: NY
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Default Re: Motor/gearing?

I have a rc4wd outcry esc in it at the moment. I have a castle sidewinder that's sitting on my bench would I be better off using that? Or just getting a 35t motor?
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