what neu motor i choose?

[rschoi_75]

http://scriptasylum.com/rc_speed/_motor_selector.html

using this will be better for you since you have a wide range of gears to choose from. They may be a few motors that will work for you. My best guess is a 1515/1Y (2200kv). On 19.2 volts, you'll be running at 42K rpms, which should be ok.