Force, mass, & acceleration (sanity check)
vehicle mass: 1,500 kg
motor torque: 140 nm
low gear: 1.86:1
ring gear: 3.66:1
wheel radius: 0.33 meter
Neglecting all losses I calculate a rear axle torque (in low) of 953 nm.
With a 0.33 meter wheel radius I calculate a reaction force of 2,888 newtons.
Newtons law indicates that this contraption (neglecting losses & assuming 100% tire adhesion) would be capable of accelerating at 1.92 meters per second per second.
Assuming that 1 g is about 9.81 m/s/s that would indicate a maximum acceleration of about 0.196 gees. I rarely do this type of calculation and usually not in the metric system. How would this hypothetical vehicle drive? lead sled? rocket? Am I even close?
What this country needs is a good 10 dollar battery pack.