RC day with Xray X4 with 4.5T mod and ARC A10 23' with 17.5T blinky

So far 4 packs with the A10, and happy with its initial setup. It is now using the same AMB unit and tyres from X4. 

I still need to learn how to setup X4 for mod motor, and make it more easy to drive. And somehow the AMB always report broken records for a 5 mins run.

I moved the same AMB from X4 to A10, and run on same track - clear 5 mins record on Speed Hive without breaking. 

A puzzle ...