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I was just trying to figure your motor speed based on voltage drop and looks like you are figure 3.15v per cell to get 63000rpm with that motor and batteries.
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What kv are you figuring for the motor?It's rated 4800 non loaded I figure loaded it's more like 4400.The new pro is rated at 5000kv,but I bet it's more like 4500 loaded.
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I would be very hesitant to run that setup on quality 4S cells as you'll have some serious speed going there.
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Well since in the end your cells dictate your speed,and this is 1 of the highest speed I've seen out of a hv in a mt like this,I have to say I have quality cells.They just don't cost alot.
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I clocked my 3905 at 47.2 with 15/68 gearing on 3s. I run HPI tires which I think are a little taller and definitely ballon more than stock. I'm limited to 3s because I run a VXL esc. I was using a Garmin GPS to check speeds. My temps are never over 130 on the motor but the does esc like to run 190 - 200.
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Are you saying thats on a 4.5 motor?Because I don't think it would do it.