Been their done that.....
1521 1.5Don 12S on a XTM MMT. Bigger, heavier then a LST and the biggest MT you can buy that is 1/8th scale. That motor NEVER got hot and the ESC never got hot doing speed runs. The fastest pass on camera was a 80.4mph.
http://www.youtube.com/watch?v=ERY9_...e=channel_page