What bl motor to use with 3s lipos
 

Ok let me try to make this short as possible, at first I was trying to order the VXL rustler, but then decided I did not want to wait 40+ days for it. So I went ahead and order a XL5 Rustler, bearings, carriers, rpm bumper, wheelie bar, Durtax Ice charger, balancer, ir temp gun and other stuff. An now I want to order the brushless motor and lipo. I want to get the Maxamps 3s 8000mah lipo, and the mamba max 5700kv motor, My question is will I be fine with the temps on the motor, with medium bashing? I started to get worried when I read people having heat issues with the 5700 and less volts. I will gear down and get a aluminim tranny case if I must. Or should I go with the mm4600 motor or maybe even a diffrent brand motor like the Feigao 12S with the mamba esc. Thanks for the input, im trying to order the motor before the 6/13th because that is when bpp.com ends the 170 doller presale on there mamba.

The 5700 will work great on 3s lipo, that is that motor's sweet spot. You should gear around 15/86 and you should be all good. Just remember that if you will be running in tall grass or deep sand to drop the pinion a tooth or two or raise the spur to a 90t. I also recommmend you get the aluminum idler gear as well because the stock plastic one will strip in no time.

Pffft! Aluminum idler? Get the steel one! And the FLM steel diff!

Thanks guys, ya I already orderd the alum idler gear with all the stuff I listed above from tower, forgot to mention that. So my temps will be alright, as long as nothing is binding or anything and I gear lower? Cool thanks

Heyitsme I just realised that you double-posted this thread. I replied to the other one too. LOL.

The 5700 is a good motor, and will run well on 3S lipo; however, if you haven't gotten the motor yet, you might also want to consider the 4600. I believe it to be more flexble. You could run it on anything from 2S up to 4S lipo. It goes from being the most sedate Mamba Max system, to the wildest of the lineup.

I think the 5700 is too close to its max at 3s, its still under warranty, but mine heated up too much no matter how i geared it, This was in a T4. I run a 4600 now in the same truck and am happier, I can run 2s and its controlable and 3S is insane

Ya I havnt orderd the motor yet but will tonight for sure. So you think 4600 will be good? what kind or speed can you get off the 4600 and 3s lipo with or around 15 thru 18-86 gearing?

Edit: And how bout with 7 cell nimhs what kind of speed?, I decided Im going to order a 7 cell IB nimh, and Maxamps 3s 6000mah Lipo

And did it seem more controlable on the 4600 motor with the 11.1 volts?

Thanks

If it were me I'd go 4600, the lower KV will make it heat up less and run more efficient. You may not be able to use the 8000 mah 3S as its big BIG, I just got a 5000 maxamps pack in both 2s and 3s. The 8000 2s will fit only a little modification, the 5000 3s will fit perfectand weigh less than a 6 cell pack

Wow what a hard choice, on other forum people telling me I will be disspointed with the speed of the 4600, when I could go with the 5700. An here you guys say its good. I dont know what to do, I got one more day to decide any other opinions would be great, thanks guys so much for the info and help

Edit: I still leaning slightly towards 4600 over 5700, because I really dont want to deal with heat issues that much, But are they any other setups that run similar price or alittle more then mamba, that will take 3s, good speed, and run cooler then mm?

And to whom it concerns Im very sorry for double posting same topic I should of only posted in this forum.

On 3s lipo, the 4600 will hit rpms of around 51,000. That's pretty high. Lower kv motors are more forgiving with gearing too. The 5700 could hit the same speeds, but you'll really have to find the sweet spot gearing-wise to prevent overheating. If you look around here, you'll see a number of examples where it is better to use a lower kv motor with higher voltage.

What other forum is telling you this? Are they brushless "experts" or people that just slap in any old thing and run it hard? Most everyone here will offer solid advice for a reliable setup based on experiences.

I bet its the traxxas forums, they got a nasty case of more's syndrome there. They got people that say a 4600 mamba is almost perfect for a Maxx. The same people say the 3500kv motor in the velineon system is junk, because its slow. Not all of them, there are a few good people with experience, but they are few and easily stomped, by volume

That's too bad. So, people are going to get the wrong info and get a system they won't be happy with and then they will have a bad taste in their mouths for BL tech in general.

This the home of the brushless "experts".

I would have to agree with the 4600 as well. I picked up a 5700, but after a couple runs, I got the 4600 and it runs cooler and is PLENTY fast on 3s.

I wouldn't say its more controlable, when you put that much power through your driveline there is no such thing as control. I will say this, I run my 4600 sunday at my track for play (nobody else had one there) even if i had a mm left to gowhen i pegged it it would wheelie out of control, I did two backflips with the T4 and blew out three tires on the 3S pack