[bmx833]

On thursday i installed my new brushless system in my TC5r (lrp tc spec + nosram 15.5).
I tested off to ground and all seemed well, but on friday, went to put it down on the track and did a little test giving it full throttle, a clicking sound came from the car and for the life of me i can't work out what it is, the gear mesh is near on perfect and the belt tension seems good?
Batteries are gm 5000 35c.
radio is dx3s
Servo is savox

Any help would be apppreciated as i have not got a clue what it could be.

Brad