Actually what i said is 100% correct. You said it yourself. The motor is not moving and is drawing the most amps at startup. Very good. So at that very point when the motor is not moving, that defines it as doing no work, thus not making any power. And Power = Work per second, Work = Force x Distance.
It takes torque to get something moving, it takes power to get it to move at a high velocity.
I don't mean any discouragement. I want to be aware that it takes more than just a typical electric scooter motor to meet the performance needs of a large scale r/c vehicle. Don't be surprised if acceleration is sluggish, and it will be no matter what motor you use if you are not using lipos.
Check out my custom converted 8ight:
Sub 7lb, lowest CG of any 1/8 buggy
Just because its a scooter motor doesnt mean it has no potential... I own a 24v Currie Phantom with a 450w brushed motor and I can wheelie from a standstill somewhat and I weigh 183lbs. A 31lb 1/5 r/c running on 36v with even a lower ratio should preform even better. It will have more torque and will have good top speed.