[Finnster]

I would listen to Brian on this, as he's worked thru the conversion, and plans out his projects very well. My biggest concern about the 540L motor would be the tremendous Tq you are gonig to be generating. Realize that a 8L on 4s is powerful enough to heave a Maxx to over 40 mph. They are just generally not used as they run too hot in such a large vehicle. Putting this in a car 1/4 the weight.... :024:

If your friend is detonating his tranny w/ a 380-L on 2S, I would not trust a larger motor on 4S. Plus, that much Tq may make the car near undrivable. I can't imagine a 2 spd would be neccesary anyway.

For all ease, I would prob go with a 4600 from castle. They designed/recommend that motor to work with that voltage. I think the 40K rpm "rule" is more applicable to larger MT sized vehicles bc of the heat issues. On such a light car I would work more within the max RPM limit. Also, since you are running a high volt setup, you will get huge amounts of power w/o drawing huge amps, which is what creates alot of heat.

Its my prediction that the 40K rule will become less important when truely hi voltage (like 8s) controllers for 1/8 scales really start coming out. The gains in eff and drop in amp draw should more than make up for any increased mech friction/heat. Obviously this applies to motors w/ a 65K rpm limit like Neus, LMTs. A Neu running 60K rpm on 8 or 10S will not be outlandish.