Bear with me, I am blonde!!
Just got my Firestorm flux turn up and it has the Motiv ESC/Motor set up... I have some 2s batteries to use with it so all good, I almost started looking for 3s but then read this online
http://www.hpiracing.com/en/kit/10554
In one breath when you read the first bit about the ESC/motor combo it mentions 40mph on 2s and up to 60mph on 3s with gearing upgrades, fine... But then when you go down and read about the ESC alone it says that it can only take 2s with the standard 5700 motor, but 3s when used with a 4700 motor (or something along those lines)... Just seems to contradict itself a little lol - I take it from that, I just stick with 2s right? I don't want to break it haha...
Had a little spin already and wow, I love it!!