Krogers

I'm new @ rc cars. I started a couple of months ago with a Legend and been running on carpet ovals. My 2nd car got a new Reedy 17.5T and a Blackbox ESC. They came as a pair and have worked ok from day one. The only thing is the car makes a funny/loud sound the last couple of feet when coasting to a stop. It sounds like ratcheting. Everyone gets a good laugh the first few times they hear it. Not a soul at the two places I run have a clue what it comes from. All the experts who've looked at the car check the gear mesh. The 48P OEM set passed muster from 3 or 4 different experts. I've now got a 64P set installed that is quieter than the 48P was, but didn't affect the strange sound at all.

I've reset the ESC mode. Or more exactly I've "restored default' (the 6th MODE setting).

I've tried two different sensor wires from the Reedy motor to the Reedy Esc. Same sound happens.

I can adjust the TX's throttle and brake amounts and the car responds correctly. BTW, the car doesn't slow to a stop any faster or slower when the sound kicks in. The sound does taper off as the car comes to a stop.

Anybody experienced this and know the fix?????

frewster

iTrader: (1)

Don't worry about it. That's just the brake. Sometimes they get noisy at low speeds.

billdelong

iTrader: (33)

Any chance you might have dropped a small metal object into the motor or is the can fully sealed?
I would consider pulling the rotor out and inspecting for any loose screws or washers that may have inadvertently got sucked up into the motor through the cooling vent holes.

Krogers

A number of experienced racers thought that too, but the car is obviously coasting to a stop while making the noise.

I'm not on the brakes (or throttle) at all when it's coasting.
The ESC and TX has been calibrated by a number of different drivers who're Reedy fans.

billdelong

iTrader: (33)

Any chance the motor got any moisture in it? If so, then I wonder if the bearings in the motor might need to be replaced if any rust has formed and/or caused any of the bearings to go out of round/seize causing a screeching sound.Could be any bearing in the car for that matter.

frewster

iTrader: (1)

Do you have drag brake turned on?

Krogers

The motor and ESC are brand new. Only seen dry carpet.

I've got some BOCA bearings coming. Will find out in a couple of days. There is no indication from the rears that those are anything but free.

Krogers

According to the instruction sheet, the ESC comes with 0% drag brake.
The ESC is one of those "beepers" so it isn't easy to tell what the settings are, and harder to set them. A couple of Reedy 'experts' have restored the settings and calibrated the sucker. It's supposedly got NO drag brake and no optional settings. Just forward and brake from the throttle.

NoEffects6

simple

iTrader: (2)

6th Mode is Not default......
If you confirm that is in in fact in Mode 6, the sound you are hearing IS the drag brake and the resistance it is inducing in the gear.
6th mode has 25% drag brake

Try setting to MODE 1 instead.

JJ100179

I am running a 17.5 turn Hobbywing Bandit Gen1 in my Tamiya TB-03.
At ​low rpm, car sounds like a shaken bag of screws nuts and other metal stuff, just like yours. At higher speeds: silence.
I think this ist related to the high torque character of these Motors.

Regards,
Michael

Bry195

Kepner

Does the car make the noise if you roll it by hand? My new 13.5 Splus motor does the same thing. It is due to the motors magnetic "indents" if you turn the motor by hand you can feel the motor "slip" from one spot to another. So at low speeds that motion is transferred to the drivetrain and any slop in the drivetrain will kinda slap back and forth. Hence why it only happens under no load from brake or accelerating. or even light load during slow starts or stops.

morvlorv

iTrader: (14)

so, is this sound bad then?
I have it on two new build i just started running.
no brakes set, no drag brakes or any breaking.
and it only happens when coasting and almost stopped, or if I manually roll the vehicle slowly.
and like I mentioned, both new builds with new electronics.

I have a wheeler that I set up the same and have been racing for a bit now and it doesnt happen with that.
I did get the wheeler used.

The noise from my examination seems to come from the motor possibly, or when the motor rotates to the next magnet.
the magnetic force seems really strong on the two new builds. The wheeler, not as strong.

So im wondering if this is just new equipment and will not make the noise after its broken in a bit?