I'm running a 14/46 gearing and 12v fans (straight off of the 4S pack) on both the esc and motor. They've never gotten hot enough to cause me to grab the temp gun, so I really can't say. I run the heck out of the setup on the track too.

If I had it to do again, I think that I would have gone with an 8XL. The 7XL is almost too much for a track or even bashing. I rarely get to full throttle and when I do, it isn't for long enough for the buggy to reach top speed. I'd go with the 8XL for even lower temps and better runtimes.