How to: Calibrate an ESC

Aaron Morris | 14th July, 2019 | 4 min read

Being a good RC driver doesn’t involve any special tricks, just reaction time and some finesse on the controls. Proper throttle use can be the difference between a particularly sweet drift and a particularly lame spinout.

But no matter how good your trigger finger is, it won’t mean anything if the throttle endpoints are not properly calibrated. This can be necessary to do if you’ve installed a new ESC, or your car (like one of mine) occasionally forgets that reverse is a thing. But good news! It’s really easy to set.

What we’re doing here is telling the car where neutral is, where the full throttle is, and where maximum brakes are. From here we get fully proportional throttle and braking, as the throttle signal works just like the accelerator pedal in a real car.

RC cars can run much slower than they should, struggle to go into reverse, or even have non-responsive brakes because the throttle/brake endpoints are not set properly.

The first step is to make sure your controller is turned on, with the throttle trim dial set to 0.

Throttle Trim Note: Many ready to run (RTR) RC Cars come with a FlySky GT-2 variant controller. On these, the throttle trim dial is the one in the middle. To set this throttle trim dial to 0, the little notch should be pointing to the left, or 9 o’clock.

With the controller turned on and ready to go, hold down the set button next to the ESC’s power switch, then turn it on. The ESC will start beeping at you to let you know that it is in programming mode. Release the set button.

Making sure that the hand controller is sitting with its trigger in the neutral position, press the programming button again and you’ll hear a single beep. You just told the ESC where neutral is. Now, pull the trigger all the way towards you, as if you are accelerating in a drag race going full throttle. Press the set button again and the ESC will beep twice to let you know it has learned that this trigger position is full throttle. Lastly, push the trigger all the way away, like you’re hard on the brakes. Pressing the set button one more time will make it beep three times, setting maximum brake/reverse point.

Now by releasing the trigger altogether, the ESC will make one long beep and the entire throttle range has been set correctly. Well done! Now your trigger finger will have full control over the RC, and you can smash some lap times.