I knew zipzaps were slow, so i tried the PCB mod and removed some resistors from my PCB. It made it fast, but not fast enough. So i combined it with 2-cell(the PCB mod warned against this, so i had to try it

). The result was a zip that's faster than my fairlady Z bit with red motor red gears, and runs all over carpet with green motor blue gears. I can also use my dks motors, but anything above the green motor and i roll it