Be careful when racing on tiled surfaces. If you're running a high end motor, regardless of your tires, you will lose control every so often, so be very light on your turning controls.
Every so often you should remove your rear axel and clean off the gunk that builds up inside of it, also while your axel is off, you should run your motor without it for a couple of minutes, this "stretched" my motor out and really helped my speed in the next race, for Dra-G racers, this is a must.
Sincerely,
Yaksha