BK warrior 9920 with 6S on 12Xl - RC-Monster Forums

hemiblas · **BK warrior 9920 with 6S on 12Xl -** 10.21.2007, 11:05 AM

Has anyone tried this combo on one of the larger monster trucks? It seems like it would be a nice setup that keeps the amps down and still get a good amount of power. I was thinking about running this combo in my Tower Terror. Right now I am running 4S with a 10L motor and it runs pretty good. I think the 6S power on a lower kv motor would pull less amps and I could get a bit more power out of it. Thanks for the help.

tashpop · 10.21.2007, 11:24 AM

sounds like a solid plan to me.

squeeforever · 10.21.2007, 12:54 PM

I wouldn't...I tried 6S/10XL/9920 and a 7020. Fried both almost right after I plugged them in. Something to do with the ESCs not being able to handle 6S I'm assuming. Even though there rated for it....

BrianG · 10.21.2007, 12:59 PM

That's kinda weird. Right off the charger, 20 NiMH cells is ~28v and 6s lipo is 25.2v. Do you remember exactly what blew on them?

othello · 10.21.2007, 02:19 PM

Same goes for a german guy with a BK9920, Wanderer 20xl10, 6s Flightpower 3700. He blew his ESC too in a 4.3Kg (9.5lb) Monster Truck. 6s seems to be too much for a BK9920 especially if you use it a lot at partial load. It will heat up quickly ...

aqwut · 10.22.2007, 02:50 PM

I ran 6S, 7XL, and 9920 on my LST...
and the 12XL on 6S is very nice... especially with the 9920...

squeeforever · 10.22.2007, 09:10 PM

I'm not really sure. I think its only select 9920's.

Brian, I'm not an expert, but from what I could tell, it was right at the battery leads on one, so I figured it was the voltage. The other just plain caugh fire...

BrianG · 10.22.2007, 09:34 PM

Wow, that is weird. Does anyone know the part numbers of the FETs and the ratings of the caps? That would necessarily define the V rating of the ESC, but at least it would narrow down the possibilities.

gixxer · 10.22.2007, 09:34 PM

I cant comment on the esc since I have never owned one. As for the motor I think 6s on a 12xl will work very well. I have a 12xl and run it on 5s with out any problems.

tashpop · 10.23.2007, 08:21 AM

i'm not sure if this fits in this discussion, but i'm running a 9920 with a kb08xl and it handles the current its pulling so far. it runs a little warm, but nothing i can't hold my hand on as long as i want. i don't have a temp gun yet to check it with that. i would think my motor would pull more current than a 12xl does.