IMO, whatever you do, STAY away from feigao. The 9L on 4s can easily push my 7.5lb 1/8 scale buggy 50+ mph, but it will overheat no matter what voltage or gearing (almost the same amount geared for 30 mph on 3s). It's just that they will heat up no matter what. They are just not the right design for cars. It doesn't take much to go 50-60 mph in a touring car. On 4s a Novak 8.5 or even a 10.5 will do 50+ with ease without overheating with max speeds of at least 70 mph.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy
thanks guys i have owned a few fegaios and they do get hot thats for sure , i would like to get a neu or medusa but my max monster is secured in my buggy and i have a bk 9920 that will only do 2 pole, maybe i will see what hacker has to offer lately, or i can buy a heat sink with fan