The Tigers with the white capped Suntech 385s run pretty close to scale speeds with metal tracks and broken in metal gearboxes. If you want to go faster, the black capped Suntechs, Graupner Speed400s and Jamara 400s will all work and provide more speed. BUT! You MUST have a fan blowing on the board's heatsink or you WILL blow it. Especially with the latter 2 motors. One of our Tigers has the new 3-1 gearboxes with 480 motors and El Mod electronics. Do a search and you'll come up with our motor and gearbox testing posts over the years.