Sounds like a nitro - why is my brushless RC sounding like this?

[Hector_Fisher]

I can't see any bent driveshafts. Gear mesh seems fine. Motor bearing seems fine. Nothings wobbling that I can tell. Spur assembly is shimmed to keep it in place. Other than maybe some drag, it drives fine, still good on power.

Maybe a bad bearing in the drivetrain that's causing a vibration? It seems to have gotten worse over time.

 

[GraniteFox]

Maybe busted some teeth on the spur or diff gears……..just a guess. It does not sound very happy.

 

[N.Mango]

I see a teardown in the near future.
Hopefully it's nothing too bad

 

[Warby]

Bent shaft?

 

[Jerry-rigged]

Maybe busted some teeth on the spur or diff gears……..just a guess. It does not sound very happy.

x2, sounds like a gear is missing a tooth or three somewhere...

 

[Hector_Fisher]

No clicking, and the front diff was just rebuilt (same noise before and after). So maybe the rear diff. Hmm, didn't think about the gear teeth...

Coincidently, at high rpms running passes on the street it actually sounds pretty wicked.

 

[Liquid SSSnake]

Motor bearings?

 

[N.Mango]

No clicking, and the front diff was just rebuilt (same noise before and after). So maybe the rear diff. Hmm, didn't think about the gear teeth...

Coincidently, at high rpms running passes on the street it actually sounds pretty wicked.

I know what you mean. I had a blown outdrive bearing and it would sound awesome at high speed but made me cringe at low speeds.