Lipo question

If you're looking at the specs of the Feigao motors, I believe that they are unloaded ratings. To get a better idea of a loaded rating for a Feigao motor, look at the specs for the BK Wanderer. The Wanderers are the same motors, but their kv ratings are under a load. 1864kv is more along the lines of what the 8XL will do under a load, IIRC.

But of course, make no mistake, the 9XL is a great motor and will probably do what you need it to. You just have to gear it a bit more. I run a 7XL/MM combo in my buggy (Sportwerks Turmoil) and my buddy runs an 8XL/MM combo in his Losi 8ight and he easily gears to match my speed on the track. If I'm not mistaken, he also gets a bit better runtime, but that might be because his buggy is lighter than mine.