im not sure if it is 540 or 550...all i know is that its called the "Stinger 20 turn" motor...anyway, i tried using this setup and nothing seems to be too bad...(by the way, this is my first time drifintg with my tt-01..SO FUN)...the ESC was hot but not like burning. motor seems like the same temp...soooo i geuss its alright? hehe