Lower KV bigger motor for longer runtimes?
 

Hey, hope this is the right section. I am currently running a 2930kv 3650 size leopard 4 pole motor and Hobbywing SC10 70a ESC in an Agama A8 electric conversion. The buggy weighs in at around 8lbs, which is probably a bit heavy for the mtor/speed control but would rather run the speed control into the ground before upgrading, if it lasts it, saves me the cost of a new controller. Question is, if I swap the motor for a Leopard 4065 size 1800kv, which has a max amp draw of 70 amps to the 2930kv's 65 amps, and gear for the same top speed will I get longer runtimes? Also, if I do gear for the same speed, I get a rollout of 1.83, I dont really get rollout, the higher kv motor has rollout ~1.2 but the lower kv should have the torque to push a higher rollut no?

Thanks for any answers, not really any RC community around here at all so help is appreciated.

In general higher voltage setups are more efficient because they use less current to get the same power. Volts x amps = watts. Current causes heat which is wasted power. So right now you have a 2930 Kv motor but you didn't say how many cells you are using with it. Lets assume you are running 3s. 3s x 2930 = 8790 /1800 = 4.88. That means that with the 1800 Kv motor you could go up to a 5s battery and keep the same gearing and you will have close to the same top end but better efficiency.