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Originally Posted by glassdoctor
I don't have the answer either, but I can say I no longer believe you need to hit a certain rpm range, like 40-50K to have a setup work well.
I used to think this allowed the motor to "stretch it's legs"....
But after running setups that peak in the mid 20k's and gearing even higher than a nitro, I think it may not matter much which route you take. Now I can't say this is ideal for happpy esc and motor temps, but it runs fine and feels good.
I would like to see how motor temps would be if I bumped up the rpm and geared down to match... I think it might be a little better.
Mike and I both ran 1515's in trucks and were geared for the same speeds. He ran the 2200kv and I ran the 1700kv. He had lower temps on the motor than I did. My temps were not bad, but they got higher than the 140's Mike saw. I don't know if track conditions/driving style etc were a factor, but the edge goes to his setup from what I can tell.
Mike's motor would have been peaked about 31,000rpm and mine at 24,000rpm... again, both geared for 30-32mph.
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Hey Dafni,
I have been struggling with this question for some time now. My motor is rated for 2500kv (unloaded) so I'm guessing its probably around 2200kv loaded. I've run this system on 5S and 6S and as expected it gets a much better run time on 6S. I have a 12XL that I've been testing with 5S to compare temps and run time. I have the truck geared about the same or a little slower than the 2200kv and the temps are slightly higher, especially on the Quark ~200F :mad:1
Glassdoctor, I am assuming that both you and Mike were running the same voltage as well (4S 8000mAh in this case)?
If that is correct, it would be interesting to see how the temps and run time changed if you both ran 5S while adjusting the gear ratios accordingly. This would give us a better idea of the kv to voltage difference geared to the same speeds.
If I were a betting man I'd say that the 2200kv motor would run hotter than the 1700kv at higher voltage but would get a better run time.