Would this work?

[JOHNNYMAXXIMA]

I have a spare motor and a spare speed controller. The only problem is that the motor is a 18th scale Dynomite C4 9200kv and the controller is a BK 9920.
Over kill on the contoller I know but would it work?

[MetalMan]

It most certainly would.

[Serum]

that will work Johnny.

[JOHNNYMAXXIMA]

Thanks, I'll give it a shot.

[JOHNNYMAXXIMA]

Ok, that's not working out so well.
I give it a little throttle (maybe 5-10% and it works fine. If I go any more than that, it starts to pulse. On, off, on, off, on, off and motor starts to get warm. Tried it with a 2s and 3s...didn't make a difference. I am not running a ubec. Left the black jumper in. I did not hear any beeps when I programmed it.
What the heck?

[MTBikerTim]

Possibly rpm too high for the 9920? Was the motor unloaded?

[aqwut]

9920 can only take 40K rpms right?...

[What's_nitro?]

Yeah that's it. I was gonna say you need to keep the voltage under like 5 volts or it will over-rev the 9920. I believe the limit is 42k. That's a 1S motor!

[JOHNNYMAXXIMA]

Originally Posted by What's_nitro?

Yeah that's it. I was gonna say you need to keep the voltage under like 5 volts or it will over-rev the 9920. I believe the limit is 42k. That's a 1S motor!

Well I just tried it on a 1s that I had. Same pulsation. I will try to reprogram it and see if that does anything.

[jzemaxx]

Hmm, my buddy runs an 8XL with a 9920 on 6S in testing on the stampede. That is over 42K rpms I thought.

[brushlessboy16]

maybe not under load?

[lydiasdad]

I believe with a 2 pole motor the esc's limit is 100k

[jzemaxx]

I thought a 9920 would not run anything more then a 2 pole. I had understood it will not work with a Neu 4 pole.

[lydiasdad]

I think your right, but the instructions for my 7020 say 2 pole motors 100k, 4 pole 50k. ????

[What's_nitro?]

Maybe mine is an old version? It's actually a 12020, but same firmware. It had a 42K 2-pole limit. I ran a Lehner XL2800 on 4S and hit the rev limit at 3/4 throttle. It wasn't pretty.