I don't know how heavy a T4 is, or the rest of the ratios (diff, tranny), but my Jato was clocked at 47mph on 2s2p moli cells with 54/22 spur/pinion, with a 4600 motor. That is pretty close to what
my calculator comes out to. Of course, it depends a lot on how stable the voltage is under load. A higher capacity battery will drop less under load and will consequentially go faster, especially with a high kv motor like the 5700.