The Feigao 580L 8L 1650kv is a great motor IMO, almost as good as the cc/neu 1518 1y 1800kv in my truggy. I love saying that "my truggy"
I ran a whole pack 6s 4000mah 40C through the MMM and 580L. I geared it with a 16t pinion with stock spur, same as the 1518, and the motor came off at 160f after the run. Esc and batts were under 100f, fan was not on at all.
160f is about 20f more than the 1518 which came of at 140f in the same setup. So thats the difference between the quality of the two, 20f. I am going to use the 580L for now, I could wheely at will, but i don't have to.
The diffs are now (f-c-r, 10k-50k-ball diff grease) I didn't have the 10k with me for the rear diff, but it drove just fine with lots of BDG pakked in the rear
I also had problems with the MMM needing to be turned off, tx off, then tx on-> MMM on, when I drove with the 1518. With the 580L this was not the case...........hmmm.
Thomas G