LRP SPX, does it require a fan with a 6.5t brushless?

[littlened]

I've got an LRP SPX running a speed passion 6.5t brushless motor, geared with 20t/78t.

At the club last night night, the temperature cut-off was cutting off power on the last lap of the race. I had a few people check and the drive train is smooth enough, and the gearing should be ok.

I know the ESC can take down to a 5.5t, but I'm just wondering, to go down to a 6.5t, does it need fan? Would the installation of a fan reduce the temperature to a safe level during racing?