It's not an apples-to-apples comparison, but I'm running a DF-03MS buggy, with a Mamba Max + 4600kV with a final ratio of 10.3. Overheating isn't an issue with mine.
The motor has the same if not more airflow then the motor in my B44.
I am running the 78T (0.5 pitch) spur with 23T (48 pitch) pinion. Yeah, the 48 pitch pinion mated with the 0.5 pitch spur is kinda loud, but it's hardly noticeable next to the 1/8-scale buggy conversion that are doing metal-to-metal gear mating...
With a 15 turn, I would try a gear ratio of 11 or so. Again, gear ratios really depends on what kind of track you are running it.
If your car is brand new, I would run the car with at least a pack or two on your bench, while the car is on a stand or jacks with the wheels off of it to break in your drivetrain and make sure that it's seating correctly. Often times, when a car is brand spanking new, the drivetrain and suspension components may feel tight.
If your drivetrain still doesn't free up after a pack or two, try to figure out where it's coming from in your drivetrain by removing a gear here or there to isolate which one is too tight...
It could just be that your motors just doesn't have enough punch to run the car at a lower gear ratio. Excessive RPMs will heat up your motor, but so is excessive loading. Electric motors draws the most current as the shaft is loaded down more and more. For example, if you stall your electric motor (say it was jammed) and you still gunned it, the motor is drawing the maximum amount of current it can (therefore most likely releasing smoke that you can't put back ;P)
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