I've been struggling to get the temperatures down on my 4000kv motor but I'm using 32dp gears. I started on 15t but i've used a 14t and a 17t as well. It was really hot on the 17t.
If you are using 48dp then I'd guess a 14t is to small.
I am going to test the 14t again after experimenting with the 17t this evening and nearly burning my fingers!
Unfortunately I stuck the whole car in a puddle and it's been running slow since then.
I'm hoping I haven't fried it.
The ESC and motor are in a Tupperware box with a silica pack the size of a crisp packet.
Fingers crossed.
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