Thanks
to get more speed, try to adjust the gearing in your car, as i did, i did not gear it too little, or as much that it would accelerate sluggish and overheat, i did try the car outside today, and i hit the same speed, but because i was on the race track, the motor temperature was increased to 56 degrees celsius, so it just shows that the ground temperature will affect the operating temperature of your motor and batteries. I was thinking about getting an xray T2, but i don't really know now...i could do i suppose and keep my T1R as a back-up car. i think if i get the gearing perfect i could possibly reach 70mph...i'll just have to give it a go! 
...Or maybe just shove a 45t pinion on the brushless system i got now