RS540 Sport Tuned Motor features performance enhancements above stock silver can motor for faster acceleration and higher top speeds. Features: Number of turns = 23 Usable Voltage = 6v - 8.4v Torque at best efficiency = 350g/cm (7.2v) RPM at best efficiency = 18,300rpm (7.2v) Current drain at best efficiency = 12A (7.2v)