I have to admit that I too am guilty of quoting specs and numbers. I've often used 30K rpms as a "sweet spot" to shoot for and adhere to that more closely with the Feigao motors. The fact of the matter is that there are variables that will also play a substantial role in the amount of success that you have with a particular setup.

The two most substantial variables to consider will be the type of terrain that you will be running on that the ambient temperature of the area of the world that you are in.

Although the better Neu motors are more forgiving of these considerations, the Feigaos are not.

I'm in southern Louisiana and it's always hot down here. I think that winter lasted all of two days last year. LOL.

Anyway, the 9XL might perform well for you and the temps might not get too bad if it is relatively cool where you are.

Down here where I am, a 9XL does fairly well on 4S, but will jump up to 200*F on 5S pretty quickly. Although I run Neu motors in almost all of my vehicles, I still run a MM/Feigao combo in my Monster GT conversion. Running the 9XL on 4S makes for plenty of power and loads of fun.

In my experience with the Compro controllers, they run cool no matter what you put them through. If you can run 6S, you could look to an 11XL or 12XL.

If you are new to brushless, you may just not know what to expect. Here's a link to a video of my 8ight T running a 9XL on 4S geared 14/46...http://s154.photobucket.com/albums/s...DSCF0303-1.flv

It is, of course, not stupid powerful, but still much more powerful than a nitro setup.