too hot only affecting mid range?

[coolhandcountry]

Maybe the track gets it hotter. Then it shows itself.
I have an esc that loses reverse when it gets hot.
I had an esc that would only run at part throttle until you jump it a few times then it would speed up. Then it would slow back down after a few more.
It smoked not long after that.

Auto2 I get this same problem with my 9920, but it also only happens during racing. The ESC is at about 155 when it does this.

I'm looking at getting a Quark 125.

[auto2]

Originally Posted by Darren

Auto2 I get this same problem with my 9920, but it also only happens during racing. The ESC is at about 155 when it does this.

I'm looking at getting a Quark 125.

darren, you thinking it is not a defect just not set up right for racing?

can you check if your caps are different temps? cause only one of the 4 get that hot.

you think a fan should be on the capacators also?

[Sylvester]

I think you should put a big heatsink on your esc and a fan on the caps - should keep it cool.

[Superbasher]

speaking of fans, can i just get an old pc fan and hook it up to a 9v battery and use it or do i have to get a bec operated one?

[squeeforever]

It's up to you.

[auto2]

if the fan is rated at 12 volts it wont do much at 9 volts.

this is definatlly some kind of heat issue.

I just ran it with a second fan on the caps and it lasted longer before I lost all mid range.
could someone check if all the capacators are the same temp or one is always hotter like mine.

I added a fan pointing at the caps but as soon as a little dirt hit it the blades broke off. guess a computer doesn't have 20 mile an hour dirt in it.LOL!

[HotnCold]

Hey ben - the caps should be about the same temp - they all do the same thing - and you may also be running boat software - but my guess is faulty controller. When Mike gets back from vacation we'll try to get it figured out for you....

[auto2]

Ok sounds like a plan.thanks

[Sylvester]

Just to clarify, i had a very similar problem with my 10L/9920 combo, but after i switched to a lehner 1950 my 9920 ran cooler and stopped glitching on mid-range operation.

I'm gonna try a 24V fan and see what I get. I think one of my caps is hotter, hard to tell with my finger.

[auto2]

darren, are you running 24volts?
I am running 14.8 and am using 12V fans .
I added a fan to the motor and one blowing on the caps and there IS a noticible difference. It is getting better.

I run 21.6V (18 cells) and a 24V was the closest to it.

When I race it and it goes all funky, I am only running 16.8V (14 cells)

I've yet to test the fan though, might get to this weekend if I can be bothered soldering it on.

Do you have any holes in your shell? My ESC is getting absolutely no air (Oops), gonna cut the shell and see how it goes.

[auto2]

update- I finally got a new controller. he traded me a 120 amp with dounle wires for the 99 amp.
Immeadiate improvment. it was definatlly a bad controller.

I was at rons and he showed me a lipo for his helicopter. Square in size( will fit on LSP and 22 volts at 4400Mah! 2 of them in parallel would be interesting.
will my new 12020 controller and 8XL like that voltage? I would have to do some serious regearing.LOL! from the 14.8 volta I have now.

[BrianG]

The 9920/12020 handle 20 NiMH cells. That's 24v so you should be OK. Just don't forget there is no LVC in the BKs...