Its been done before on some RC site, but its v.dangerous! it was the same method as NOS, but Motor Spray, that which a press of the 3rd channel of the transmitter, it would sqirt a mist of motorspray onto the brushes, which is turn increases RPM for a split second, but it wears are the brushes and makes them craz hot, they turn purple!
Sure the colour change is due to a bad connection with the com, mainly on High RPM upright brush based cans, used to race a RC10-B3 a while back, keep meaning to dig it out and have another bash at it
