If you can find a 34v ESC then you can just limit the voltage on the stick travel like you do with Gimli if need be. As for modding a TZ85, the mosfets in that can only take up to 30v ( http://www.a-power.com.tw/files/AP_P...R403GMT-HF.pdf ), so you'd have to make a separate mosfet driver board.. my plan was to buy some of those £6 20A ESC off ebay then use the drivers on them to drive a separate high current mosfet board.. or just construct my own dual ESC from scratch like usual