Hobbywing Max10 G1 cutting out / cogging issue

[DavidB1126]

Noticed this issue Sunday while at the park bashing. Also noticed it yesterday while also bashing in the yard.

It will run fine. And then cut out. The motor would cog very bad. And then cut out. The car and steering still works though.
Thought it was the LVC so I changed that from Auto Medium to Auto Low. At first at medium LVC with one of my Zeee packs, it cut out at 3.8v/cell. In the video with my hoovo pack it cut out 3.7v and 3.9v/cell. (I know its a huge cell difference but I'm just running till it gets worse and then ill take it to staples to get it recycled). So by this, I knew it couldn't be the LVC setting. Might take it back out today with LVC disabled but ill see. The ESC and motor are not hot at all. Checked the motor wires and bullets. Unplugged them and plugged them back in. Came back working but shortly after it cut out and cogs again. Maybe the motor bullets? Wire? Wire going into the motor? Or bullets on the esc side?

Tried recalibrating a bunch of times but still same thing. One thing to note is that if the motor doesn't beep, it won't work.
But overall, I had this combo for 2 years (October of 2022). Got it right before they discontinued it for the Max10 G2s. Planning on upgrading anyway to a 10BL120 G2 3660 combo and keeping this setup as a spare for another car possibly.

Disregard the other side noises in the video. New neighbors across the street and guess that their dog was having a fit.

 

[Greywolf74]

My guess is either your lipos are high IR and the voltage is sagging lower than normal causing it to LVC prematurely or the ESC is going bad. I'm betting it's a voltage sag from bad batteries though.

 

[DavidB1126]

My guess is either your lipos are high IR and the voltage is sagging lower than normal causing it to LVC prematurely or the ESC is going bad. I'm betting it's a voltage sag from bad batteries though.

Gonna charge up my good Zeee packs and see what it does. And I'll have my cell checker in and I'll see if the voltage drops when on throttle

 

[DavidB1126]

Tested it out. Duct taped my cell checker in there. Also figured out how to set the alarm on it today. Never knew I could do that lol.

My battery was at 3.75 both cells. Probably bout 10 seconds of full throttle down the alley the alarm sounded. Had it set for 3.60 volts so I guess after some full throttle action the volt drop was .15?

These were on my Zeee 5200 80C packs with a xt60. Cells are well balanced. Last time I read the IR, cell 1 was 2.1 and cell 2 was 1.0 milliohms.

Now here's my question. During full throttle which cell is dipping lower than the other, or are both cells dipping under throttle?

Edit:
Before going out and testing it in the alley I did a couple of full throttle tests on the workbench with the cell checker which the wheels were in the air so no load on them. I didn't notice any voltage difference.

Very weird since I had this esc for 2 years and never had any issues. Had these pairs of batteries since April and never had an issue til now.

Battery related or esc related?

Also noticing while testing in the alley, it didn't cut out or cog out. Guess the .15 volt drop wasn't enough to cut out the motor.

 

[WickedFog]

Tested it out. Duct taped my cell checker in there. Also figured out how to set the alarm on it today. Never knew I could do that lol.

My battery was at 3.75 both cells. Probably bout 10 seconds of full throttle down the alley the alarm sounded. Had it set for 3.60 volts so I guess after some full throttle action the volt drop was .15?

These were on my Zeee 5200 80C packs with a xt60. Cells are well balanced. Last time I read the IR, cell 1 was 2.1 and cell 2 was 1.0 milliohms.

Now here's my question. During full throttle which cell is dipping lower than the other, or are both cells dipping under throttle?

Edit:
Before going out and testing it in the alley I did a couple of full throttle tests on the workbench with the cell checker which the wheels were in the air so no load on them. I didn't notice any voltage difference.

Very weird since I had this esc for 2 years and never had any issues. Had these pairs of batteries since April and never had an issue til now.

Battery related or esc related?

Also noticing while testing in the alley, it didn't cut out or cog out. Guess the .15 volt drop wasn't enough to cut out the motor.

As Grey mentioned, I bet it's the voltage drop causing it. Your better battery worked fine, so that should be a bit of a clue pointing to the other batteries.

Another thing that may be contributing to it on weaker batteries that would normally be ok on a smooth running kit - is the truck in good maintenance? Bearings all ok?

And your alarm test, you're saying you had .15v drop while testing, on the bench. But did you lower the voltage alarm to see if was actually dropping more than .15v? No you didn't, did you huh? Did ya? Well did ya? Punk?? (Dory from finding Nemo). So it may be dropping more than that. And actually driving in the yard would drop it more as well.

 

[DavidB1126]

is the truck in good maintenance? Bearings all ok?

Yeah
Put new bearings in the rear wheel hubs bout 3 weeks ago? Can't remember but yea they are fresh and if I take the pinion off they roll fine

But did you lower the voltage alarm to see if was actually dropping more than .15v?

Well to be fair, I was on a fully charged battery and the alarm only goes up to 3.8v.

Fully charged it again and did another run in the alley. 4.13v a cell when I checked it after. Alarm sounded when under throttle.

Tomorrow I can test my old SMC packs I use in the slash. But I will have to use adapters for

 

[WickedFog]

Yeah
Put new bearings in the rear wheel hubs bout 3 weeks ago? Can't remember but yea they are fresh and if I take the pinion off they roll fine


Well to be fair, I was on a fully charged battery and the alarm only goes up to 3.8v.

Fully charged it again and did another run in the alley. 4.13v a cell when I checked it after. Alarm sounded when under throttle.

Tomorrow I can test my old SMC packs I use in the slash. But I will have to use adapters for

The alarm went off, but no problems with ESC?

And you can set the alarm voltage to whatever.

 

[DavidB1126]

Came back from another run

Motor cut out and cogged but the alarm didn't sound this time. Battery currently at 3.84v/cell. Alarm set to 3.5v

And you can set the alarm voltage to whatever

Alarm can be set to any voltage variables by 10. 2.9v to 3.8v

Should add
If the motor cuts out it will cut out and stay like that. I have to unplug the bullets and then replug them in and basically resets itself. It's weird

 

[WickedFog]

Came back from another run

Motor cut out and cogged but the alarm didn't sound this time. Battery currently at 3.84v/cell. Alarm set to 3.5v



Alarm can be set to any voltage variables by 10. 2.9v to 3.8v

Should add
If the motor cuts out it will cut out and stay like that. I have to unplug the bullets and then replug them in and basically resets itself. It's weird

Reset your ESC

 

[DavidB1126]

Reset your ESC

Same thing.

 

[WickedFog]

Stupid ESC's without actual LVC values. Try your SMC's in it.

 

[DavidB1126]

Another tests

I feel like the cogging and cutting out issue is a separate issue from the voltage drop issue. The cogs and cuts happen at random and right before it cogs out I don't hear the alarm.

The max drop I saw / heard today was .2 or .25 volt drop

 

[WickedFog]

Another tests

I feel like the cogging and cutting out issue is a separate issue from the voltage drop issue. The cogs and cuts happen at random and right before it cogs out I don't hear the alarm.

The max drop I saw / heard today was .2 or .25 volt drop

Repeat the test on the bench. Infrared temp gun in hand. Let her rip full blast and let it hit LVC. Watch your alarm to see where it cuts off. Watch temps everywhere. Maybe that will show you something with a more gradual battery drain. Don't wrap your shirt or anything up in the tires

 

[DavidB1126]

Repeat the test on the bench. Infrared temp gun in hand. Let her rip full blast and let it hit LVC. Watch your alarm to see where it cuts off. Watch temps everywhere. Maybe that will show you something with a more gradual battery drain. Don't wrap your shirt or anything up in the tires

Got back from another test (not on the bench) with the SMCs. Same voltage drop issue. Had 2 alarm sounds. Total I think like 6 passes back and forth. Motor didnt cogged out but did cog out as soon as I put it in the ground.
Same .2 or .25 volt drop as the zeees.
These SMCs are discontinued. 7200mah stick packs. 90C. I'll try it on the bench tomorrow and I'll use my Maclan shorty I had for the race buggy. If the Maclans do the same volt drop, guessing it can't be the battery?

 

[WickedFog]

Maybe it's the ESC going bad. You sure it's not getting hot?

 

[DavidB1126]

Maybe it's the ESC going bad. You sure it's not getting hot?

Motor ain't hot at all.
Esc Luke warm

I'll test it later

 

[DavidB1126]

On the bench. Let it ran for 10 minutes. Esc bout 77 degrees. Battery is 74 degrees. Motor is 115 degrees. Started at 3.65v/cell and now it's sitting at 3.55v/cell

 

[WickedFog]

On the bench. Let it ran for 10 minutes. Esc bout 77 degrees. Battery is 74 degrees. Motor is 115 degrees. Started at 3.65v/cell and now it's sitting at 3.55v/cell

Good time to check any bearing temps you can see too.

 

[DavidB1126]

Racing buddy of mine says it's either a missing pole in the motor or a bad bullet plug

 

[WickedFog]

Racing buddy of mine says it's either a missing pole in the motor or a bad bullet plug

Got another motor you can swap in?