I have been wondering when this conversation was going to start here, I got a few things to add. I'm not all that scientific, I go by feel and temps. I have played with higher voltage and lower kv for a few years now, I see the efficiency both in temps and runtime. I started with a full FLM'ed stampede, with a lehner basic XL1200/1200kv motor, a Quark 80 esc
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I forgot what the weight was, but heavier than most Stadium trucks. I could run 60+ minutes running a 4s 3700 mah 20C flightpower lipo. Not sure exactly what the gearing was, but it did 45 on radar runs with masher 2k tires. Temps always at around air temps
Next i put the motor and esc into my RC10 gt conversion with 20/66 gearing on stadium truck tires. This time on a 5s 2500 25c flightpower lipo. It was nothing fancy, just a good basher. I could run as long as my mamba 4600 (CM36) powered T4 8000mah MA pack, roughly 30 minutes. Temps never above air temp geared to 35 mph, only problem was it spread the diff outputs to the point of the dogbones slipping
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The latest setup is using my associated T4 and running 4s lipo running a 23/87 gearing on ST tires, I expect to run over an hour on the same pack as the stampede, The 3700 4s 20C. will post pics when i really test it out.
Glad to see others looking at this