I have the Co27 in one of my Pedes an it dose really good. Enough power to pull the wheels with 19t/86t gears<no slipper old straight style input> and enough torque tolug it up the hill in my yard. The other motor I have is a 19 turn Orion Method R, now I run that one in flat dirt at my local park. The part of the park I run in is the dirt track they use for Demo derbys and midget car oval, just rough enough to get some good jumps but smooth enough to run flat out if I want. It has more speed there than my 27t, BUT I cant run it at home cause it dont have enough torque to lug itself up my hills gearing on it is 17t/90t with a slipper. Have to run 17t to keep temps down. another motor I have heard good things about an is cheap is the http://www3.towerhobbies.com/cgi-bin...LXJ766&P=K Now I have no personal experince with this motor but have heard many good things about it and its ability to take more voltes than listed. More volts more power but carefull there cause more power can mean more heat and another fried motor.