Concerns about mamba heating up???

[hanomag]

Hi,

I just bought a new set-up, mamba-max 7700. I bought this because I had a good price for it.

Right now I'm using this in my tamiya TT-01 to drift. Before the mamba set-up, I was using the stock motor and the esc TEU101bk from tamiya.

Most of the time, the esc was never hot. Even after 4 packs of batteries, everything was cool. The can motor was hot but it was ok.

Yesterday, I did my first run with my new set-up. I'm using ABS tires to drift. Wow, what a difference!!! The car was gliding around so easily. After the first pack, I notice that everything was pretty hot, the esc, the motor, the battery pack. So, I stopped for about 30 minutes to let the thing cool down a bit. After that, I put my second battery pack and started to drift. But again, after the pack, everything was pretty hot.

So, my question is: Is it normal that everything is heating up like this? Is it dangerous that I damage something (esc or motor) ?

This is new stuff for me and I'm not sure.

The only thing I know is that those set-up are meant to be use with a good gear ratio. My gear ratio is spur 61T, pinion 19T, 48 pitch.

The other thing is, I'm planning to buy a new XRAY chassis in the future and I will use this set-up to run the chassis. I know that it will be better to use that thing in something more tunable than a TT-01. But for now, I just want to have fun with my new motor but I don't want to damage it.

[OldSchoolRC]

Hi - sounds like a fun set-up!

I would try going with a lower gear ratio if possible. (not sure what is stock) you won't lost much on the top end with a 7700 and you'll notice more punch. And it puts less stress on the motor and ESC which should help it run cooler.

Also, with drifting, you don't get as much air. maybe a cooling hole in the body?

if your haven't hit thermal cutoff yet, you should be ok.

[crazyjr]

One thing to consider with brushless, is that they are load seneitive. On brushed, they are pretty much happy with lower loads, but can warm up if hit max rpms too much like brushless. Brushless however, because they are more controlled by the esc than a brushed, will have some troubles when load is less, or rpm is maxxed for long periods. I'll yuse my rc10 T4 for example, I run a Novack dually for many years before going to brushless, I have run motor from stock to 10 turn and the gearing did, but didn't matter much on heat, till you over geared it. Brushless on the other hand has some guidelinesNovak brushless have a gearing outline where they work best, but most others you got to find you're way. My T4 running a 5700 mamba got super hot in 14/84 gearing but cooled down at 20/84, problem was it was too much for racing, running close to 50 and hard to drive, with the front wheels averaging 1/2inch off the ground. I now run a 460 on 2s lipo and am much happier with the way it runs, on a 30+minute run it is at , Motor 170*, ESC 120* and battery barely warm . this was in 95*heat and a muggy day.

I think you're problem is with the spinning, is that you are not properly loading the motor and spinning at max rpms for the cells is causing a lot of problems, Do you have a temp gauge, If so what are the temps? you will be ok if you are under 200* according to castle

sorry for bad typing and grammar, not one of my strong suits

[bwoods040]

how about trying a clip on fan on the esc and/or a heatsink on the bl motor.

[bwoods040]

how about trying a clip on fan on the esc and/or a heat sink on the bl motor...??

[hoober]

You should probably put some numbers to "pretty hot" since it means 150 ° F to me and all may be well. It will mean different things to different people.

Now what were those max temps for components? :confused:

Nimh batts 150 ° F
Motor 200 ° F
ESC ?