Ive ran several 4x4's and they're plenty fast, with the stock motor. Just got what I described in the title, and use a 3s 40c battery, and its going about 30? Got a gps to put on it to make sure. My E revo 1/10 is about twice as fast, didnt think this would be the case.
Using a center diff with 19/50. Top end isnt really that big of a deal, as I race short course concrete, but I dont understand why its not very fast. I havent messed with the settings with castle link, perhaps it comes stock limited for some reason?