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Old 20-02-2015
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Default Reducing speed for kid

My kid is learning with one of my old cars, the motor is too fast for him so I turned the throttle trim on the transmitter down to half which is perfect. But the motor is getting hot, do I need to put a smaller pinion on?

Last edited by Rob; 20-02-2015 at 07:12 PM.
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Old 20-02-2015
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Is he crashing a lot and holding the throttle on? My lad does
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Old 20-02-2015
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motor draws more current at low rpm, id put in a slower motor or smaller pinion to let the motor rev more and keep the speed down
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Old 20-02-2015
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Quote:
Originally Posted by mark christopher View Post
motor draws more current at low rpm, id put in a slower motor or smaller pinion to let the motor rev more and keep the speed down
Yeah think thats it as its running at low rpm for long periods, will put a small pinion on it.
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Old 20-02-2015
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both my kids b4's are running 27 turn stock motors on lipo, geared 20/81. fast enough to entertain and slow enough not to break too often. no heat issues and around 20 mins on a 5ah lipo
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Old 21-02-2015
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Small pinion is the easiest fix. Also, turn the timing down a bit so the motor doesn't get too hot or become too 'cammy' - nothing, nothing, nothing then BAM - full power. HTH
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Old 21-02-2015
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Put a smaller pinion on today and it was a lot better. Realised though that with slowing it down quite a lot though he just going round full throttle all the time, so need to speed it up a bit to bring in some throttle control. But he getting the hand of steering it though now well.
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Old 22-02-2015
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Always brings a smile to my face when someone new gets the RC bug! Hope he enjoys it all Rob.
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Old 22-02-2015
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Quote:
Originally Posted by Rob View Post
Put a smaller pinion on today and it was a lot better. Realised though that with slowing it down quite a lot though he just going round full throttle all the time, so need to speed it up a bit to bring in some throttle control. But he getting the hand of steering it though now well.

Haha my lad was doing that in places today. Full throttle everywhere
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Old 22-02-2015
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Quote:
Originally Posted by Rob View Post
My kid is learning with one of my old cars, the motor is too fast for him so I turned the throttle trim on the transmitter down to half which is perfect. But the motor is getting hot, do I need to put a smaller pinion on?
Did you turn the epa down or did you actually turn the trim down??? Because that could also be the reason why you're generating heat in the motor, you are throttling up with the brakes slammed on then.
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Old 22-02-2015
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Quote:
Originally Posted by SLEENAD View Post
Did you turn the epa down or did you actually turn the trim down??? Because that could also be the reason why you're generating heat in the motor, you are throttling up with the brakes slammed on then.
Turned Epa down.
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