I wouldn't recommend them in a heavy, but that being said if your drive train is very tame then maybe...

Check out the graphs here.
http://www.botbitz.com/manuals/TZ85A_Manual.pdf

Of course the will never do 85A indefinitely but its really a question of how long you NEED to pull 85A for.

BTW these tests were conducted @ 12V most bots run considerably higher voltages which means more power running through the ESC which will contribute to the heat. Keep in mind this is a $65 controller, which was intended for featherweights.

And I did this to it


Yes those are clamps.

I have worked out a way to pair 2 x TZ85as together to make a custom ESC. Aim is to use it in a pair of middleweights at some point in the future. 3x increase in FETs and will have custom heatsink. If it ever gets built you may be able to have your Heavy Hacked Hobbyking ESC.

For updates on our dev we are most active @ www.facebook.com/botbitz

Steve