Originally Posted by san.

I used a friend's Epic Duo 2 at max motor timing with a 3.48 FDR. We also had a heatsink with fan, so make sure to check your temp after 2min around the track.

Regarding the TCX for stock racing, I'm not sure you will be able to run an FDR that low. Unless you mod the motor mount. I used my Cyclone TC for that class.