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Old 01-27-2015, 04:19 PM   #1
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Default Very Low-Tech Homemade Chassis Dyno

In a prior thread I described my need to match two cars that have different speed controllers. One is a HobbyKing variable-timing (but no "blinky" no-timing setting) ESC with fixed endbell motor. The other is a HobbyWing Justock (no-timing) ESC with an adjustable endbell motor.

This is how I matched them.

I took an F1 car with brushed motor, turned it over and hooked the motor leads to a voltmeter.

Last edited by ic-racer; 01-27-2015 at 04:38 PM.
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Old 01-27-2015, 04:21 PM   #2
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I then set each car (with the battery it normally uses) on the F1 car and measured the voltage the F1 motor develops at maximum throttle.



Last edited by ic-racer; 01-27-2015 at 04:35 PM.
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Old 01-27-2015, 04:31 PM   #3
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It turns out that when the HobbyKing 45-A X-Car ESC is set to "VERY LOW" timing it matches the other motor set to "0" on the endbell.

So the HobbyKing 17.5 ESC and X-Car motor combo, when set to "VERY LOW" is essentially in "blinky" mode, but it doesn't blink. So no one will believe you.





BTW: These cars are 'outlaw' 17.5 VTA cars are being set up for our NOVICE class which is just a 'run what you brung' class. They are identical TB04 Pro Tamiya with the same gearing. 17.5 motors because that is what I have laying around. VTA Legal 25.5 motors are expensive.

Yes it surprises me also, that our track is so competitive, this is what kids are running!
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Old 02-11-2015, 08:26 AM   #4
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I wanted to get a little more information about the motors in my kids cars. I found a Fantom Facts Dyno and hooked that up. I was able to set the timing of a old Trinity race motor in one kids car to almost exactly match the power curve of the inexpensive fixed-endbell HobbyKing motor in the other's car.
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