it took me a while to understand it at first to but basicly. kv is the turn way to messure motors corectly really, you can go by turn in brushless but every manufactor has differant kv rating for the same turn, witch is partly to do with why one 13.5 motor is quicker than another 13.5 motor. if you do a google search you can give yourself a rough idea with kv figures related to turn but each make is differant. if intrested i have a castle creations 5700kv motor if its the kinda thing you are looking for.
higher the kv the faster the motor will be in general but a lower kv will be better in a heavyer car than a higher kv motor as is it more weight for the higher kv motor to shift so has to work harder witch then means is gets hotter.
if im wrong please correct me someone but this is what i have learnt about brushless
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