Changing motor wind for my lads

[daz75]

My lads have been using 17.5 motor's in the losi 22 for a few races and have been driving better and better and had no breakages

As the summer season starts and maybe after a couple of races I'm thinking of changing the motors to slightly faster ones

Any suggestions on a wind I see a lot of 13.5s about would that be too much of a speed increase?