http://www.rc-monster.com/forum/show...eed+calculator
try that.. plug in all your variables.... should give you a real good place to start
Jammin CRT MM/Neu 1515 1700kv
Losi 8IGHT MM/Neu 1512 1900kv
Kyosho 777
T4 MM 5700
B4 LRP
XX4 MM 7700
old losi xxcr, MM4600 4s lipo 70mph+