Quote:
Originally Posted by Mofomaxx
This truggy is NEVER gonna race, its gonna be setup as a multi-surface extreme bash truck, fair mix of grass & parking lot running with top speed runs, donughts & general marlarkying about is the order of the day.....
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Just my 2cents from a basher who has NEVER raced. It seems a lot of these 4S setups on 2050 and 2200 kv motors work very well until you try to gear for more than 40mph. Then you start to get a lot of amp draw with the higher gearing and the motor gets pretty hot.
I kinda play the way you described in the beginning and was running a 1512 2.5d (2050kv) on 4S. It was plenty powerful, but on grass the temps really started to get pretty hot ~170*. I tried to go up to 5S or 6S to lower the temps, but with the faster motor speeds it's didn't really compensate well. Even though the Neus can handle the faster RPMs I still don't like going for setups that rate over 35k rpm at a nominal 3.7v/cell.
I had a conversation with a Castle tech a few years back and in chatting with them they brought out one point which made a lot of sense - a motor will try to get up to the speed it was designed for as quickly as possible - and will draw as many Amps as necessary to do this. So if you have a 1500kv motor and a 3000kv motor, both on the same voltage, the 3000kv motor will pull about twice as much current to get up to twice as many rpms for that voltage. So for racing it may not be too much of a problem because it's more about control than always going WOT, but for bashing it's a lot of stop and go with tons of WOT acceleration from a standstill (and on grass that equals a lot of friction your going against).
^^I guess what I am trying to say is that with a motor spec'd for 40k+ rpm at whatever voltage I think your going to be wasting a lot of current just spining up the motor.
Anyway - I just picked up a tekno 1515 2.5d to run on 6S and I am getting more powerful, smoother, cooler running everything. I am getter better runtimes on a 6S 2600mAh TP packs than I ever did on a 4S 5000mAh pack. Battery temp on the 4S used to be touching ~135 and I haven't gotten the 6S pack over ~110 now.
I would recommend for the type of bashing you want to do just what the ImpaktRC guys advertise for their tekno Neu motors on the web page. 1Y for 4S, 2.5d for 5S, and 3D for 6S. Personally I say go for the 6S setup since you are going for the MMM.