I'm using the 3200 kv motor. On 3s temps max out at about 160F in my xxx-4 but that is because the sticker covers most of the motor and limits cooling. I'm going to remove the sticker and see what happens. In my experience, lower kv motors have never improved temps without sacraficing A LOT of power while doing so. I originally went with this motor to be able to run 4s, but it turned out to be a much better 3s motor. It's probably also the quitest motor you can find.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy
They're very similar to the castle motors (same rotor size, same coreless design, same external shape and size) although rebuildable and with solder tabs. I'm sorry this is turning into a tekin thread, but at least its good motivation for castle to hurry up with lower kv motors for 1/10 scale.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy