[jhautz]

If you want to stay cheap on the motor, keep the rest of your setup and just go with a 10xl or 11xl. I found the 9xl on 5s gets prtty hot, pretty fast. I ran a Hacker 10xl (the motor feigao copied) in my buggy and it ran great on 5s. I would expect taht the lower quality feigao would run a bit hotter than the Hacker, but the 10 xl will still run cooler and you should still have not issue getting to 40mph with it.

Just my opinion, but if you go with the lower end motors and want long runtimes without overheating, keep them at or below 30,000 rpm. You can run them faster than that, but they just overheat faster.