Choice Of Motor For Brushless Jato

[BrianG]

I don't know about that. I get almost 50mph on only 2s and it doesn't even break a sweat (both ESC and motor temps are lukewarm at worst). On 3s, it should easily get to ~60mph.

[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.

Thank you for all your repply. But i'll wait little time before order a new motor.
To the place, i'll try my Feigao 540C 8XL that i've on my LSP conversion and put it in this Jato and gear it with a 26 pinion, and change the original tires for the moab, they have 1 inch more on total diameter than standard 2.2 stadium truck tire.

So considering that the rpm/volt of the 8XL is about 2083, on 14.8 volt, with the single speed convertion, gear 54/26, and with the extra inches tires balloning, i would hit about 60m/h + if i put all this number on the r/c calculator.

[Finnster]

Originally Posted by david lamontagn

Thank you for all your repply. But i'll wait little time before order a new motor.
To the place, i'll try my Feigao 540C 8XL that i've on my LSP conversion and put it in this Jato and gear it with a 26 pinion, and change the original tires for the moab, they have 1 inch more on total diameter than standard 2.2 stadium truck tire.

So considering that the rpm/volt of the 8XL is about 2083, on 14.8 volt, with the single speed convertion, gear 54/26, and with the extra inches tires balloning, i would hit about 60m/h + if i put all this number on the r/c calculator.

An 8XL?!:030:

I weep for your tranny. Are you going to be able to find 5mm pinions in that size? If you get it worked out, please get a vid :P

[Scoob]

Originally Posted by BrianG

I don't know about that. I get almost 50mph on only 2s and it doesn't even break a sweat (both ESC and motor temps are lukewarm at worst). On 3s, it should easily get to ~60mph.

Wow, I get like 33-34 in a T4 on 2s with the 4600. My 5700 will hit 45 if I overgear to the point that it overheats quickly but on normal gearing does about 37-39. You must be running a 2-speed? If that's the case, people who say a 2-speed is useless in an electric are crazy.:003: There is no way I could gear my 4600 for that kind of speed (if it could even pull that from a dead stop) without overheating in a minute or less. That is fed by an 8000 2s lipo. I could only get 45 out of it on a 6000 3s. I use it to race on tight, small courses and the 5700 on larger ones.:dft009: