Quote:
Originally Posted by littlened
At the weekend I did six laps of a race when my car cut out, then it started going again, then it cut out.
I felt the heat sink on the LRP SPX speed controller, and it was too hot to touch.
I was running a 7.5t novak brushless motor and gearing 78/22.
I noticed when it was working, it felts really slow out of the corners, but built up a decent speed on the straight.
I guessed the 22 pinion was too much, so I've dropped it down to 20, had a mess about in the house, and the ESC is still far to hot to touch, and I can't hold the back of my finger on the motor for more than 2 seconds.
Last time I ran the car it was running a 9.5t brushless motor with a 20t pinion, and it ran fine.
Is the 20t pinion still too much?
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Not sure why you went up on the pinion when you went from a 9.5T to a 7.5T, as that seems opposite of what one should do as standard practice.
In my opinion, just changing two teeth on the pinion is not a drastic enough of a change if the motor and esc were THAT hot. Mistake people often make is to adjust by a tooth or two, when they need to change by several teeth to make a difference.
As others suggest drop well down (16T), or until it runs cool, and adjust upwards from there. If it is still running hot, and maybe before hand, check to see if you have some other binding somewhere in the drivetrain.