Who was wrenching today??? What did you do??

[WickedFog]

The Cobra may have taken a hit, and is having a harder time pushing the load through it's circuitry. That would draw more amps from the battery, causing more voltage sag. That's my only guess. Take a temp gun to each motor and ESC after a brisk run (the trucks - not you) and see what you get. That is, if you can even get the Cobra to heat up. Report back what you find. Leave both bodies off so the electronis are still at temp when you read them.

Did you try the new batteries? Sorry if I missed that, or my brain deleted the info.

 

[Littlemotor]

For sure, the mt8 is still the rtr esc/motor. But it’s not much of a slouch

Weight wise the mt8 feels heavier (no scientific evidence just left hand vs right hand) performance wise the mt8 hangs with tekno and actually will outrun it given the driver (tekno is geared conservatively, has room for more but has been plenty for us ). The mt8 runs hotter it seems (again no evidence cause I’ve never taken the temp gun to the mt8, only the tekno but my finger says the mt8 is definitely hotter after a good run )

I’m sure there is more to it though. Just another note when the tekno was cutting out and beeping the low voltage tone within one full throttle run the battery showed over 4 volts per cell. After running it in the mt8 today to it’s cut off they were at 3.7 per cell. The tekno isn’t on a radio that has telemetry but the mt8 is and it never dropped out below 14 volts. The data log on the tekno showed it would hit 13.2 volts on one wide open burst within seconds when it was having issues.

hope maybe some of that makes sense, was interrupted multiple times tries to type and have had a few wobble pops

Ill have to hit ya back after I get some food in me-just about to start cooking..

 

[Lostinthewoods86]

The Cobra may have taken a hit, and is having a harder time pushing the load through it's circuitry. That would draw more amps from the battery, causing more voltage sag. That's my only guess. Take a temp gun to each motor and ESC after a brisk run (the trucks - not you) and see what you get. That is, if you can even get the Cobra to heat up. Report back what you find. Leave both bodies off so the electronis are still at temp when you read them.

Did you try the new batteries? Sorry if I missed that, or my brain deleted the info.

Yeah that’s what I was tryin to say I think the 410 with the cobra was fine with the new battery, it ran probably close to 45 minutes without an issue. It wouldn’t run more then a minute on the same battery I ran in the mt8 today that lasted probably a half hour or so which was pretty normal

 

[Lostinthewoods86]

And on temps, I’ve never checked the mt8 I assumed the rtr was equipped appropriately. The motor does get hot to the touch. The cobra though does have on demand fan on esc that hardly runs, the motor is never hot enough I can’t keep my hand on it. The times I’ve checked it was like 110-120ish, I’d have to look back but I think datalogger showed 130-140 max temps for esc and motor

 

[WickedFog]

And on temps, I’ve never checked the mt8 I assumed the rtr was equipped appropriately. The motor does get hot to the touch. The cobra though does have on demand fan on esc that hardly runs, the motor is never hot enough I can’t keep my hand on it. The times I’ve checked it was like 110-120ish, I’d have to look back but I think datalogger showed 130-140 max temps for esc and motor

Well, maybe it was a combination of crappy batteries with fairly high IR's and the Tekno pulling a heavy load.

 

[Lostinthewoods86]

Well, maybe it was a combination of crappy batteries with fairly high IR's and the Tekno pulling a heavy load.

It’s just weird the same battery was fine in the sct/buggy with tekin rx8, was fine in the mt8 with rtr esc, and had been fine in the mt410 until just last week.

 

[Doom!]

It’s just weird the same battery was fine in the sct/buggy with tekin rx8, was fine in the mt8 with rtr esc, and had been fine in the mt410 until just last week.

I'd blame sunspots. Probably had a bunch os solar activity.

 

[Littlemotor]

It’s just weird the same battery was fine in the sct/buggy with tekin rx8, was fine in the mt8 with rtr esc, and had been fine in the mt410 until just last week.

Electricity is funny like that…

 

[Lostinthewoods86]

I'd blame sunspots. Probably had a bunch os solar activity.

It’s climate change I knew that had to be the cause

 

[WickedFog]

It’s just weird the same battery was fine in the sct/buggy with tekin rx8, was fine in the mt8 with rtr esc, and had been fine in the mt410 until just last week.

That the battery that got the balance plug ripped off?

 

[Lostinthewoods86]

That the battery that got the balance plug ripped off?

Yes and no. We had 2 4s batteries, both identical and bought at same time. Cnhl 6600 mah, 120c racing series. One had the balance plug ripped off, the other didn’t. Both batteries did the same thing in the mt410 after they had have many good runs thru it previously. And I purposely ran the repaired battery in the mt8 to see. No problem.

 

[WickedFog]

Yes and no. We had 2 4s batteries, both identical and bought at same time. Cnhl 6600 mah, 120c racing series. One had the balance plug ripped off, the other didn’t. Both batteries did the same thing in the mt410 after they had have many good runs thru it previously. And I purposely ran the repaired battery in the mt8 to see. No problem.

Strange coincidence that two batteries started having a problem at the same time. That tells me something is different after the short. I'd contact Castle and see what they say. It may or may not have been damaged. But if it is working now with fresh batteries, no worries. But I would want to know what is going on.

 

[Littlemotor]

Yes and no. We had 2 4s batteries, both identical and bought at same time. Cnhl 6600 mah, 120c racing series. One had the balance plug ripped off, the other didn’t. Both batteries did the same thing in the mt410 after they had have many good runs thru it previously. And I purposely ran the repaired battery in the mt8 to see. No problem.

Strange coincidence that two batteries started having a problem at the same time. That tells me something is different after the short. I'd contact Castle and see what they say. It may or may not have been damaged. But if it is working now with fresh batteries, no worries. But I would want to know what is going on.

What’s not strange to me is that they were both CNHL packs, considering one was damaged, the other was not, and they were purchased at the same time.. Just my .02..

 

[WickedFog]

What’s not strange to me is that they were both CNHL packs, considering one was damaged, the other was not, and they were purchased at the same time.. Just my .02..

I don't think the balance plug being ripped off actually damaged the battery. The balance wires aren't big enough to carry more than about 10 amps or so. They would have fried almostly immediately, and a 10A load on a LiPo shouldn't even make it flinch.

It would be nice if Lost had a datalogger to see a bit more about what is going on.

 

[Lostinthewoods86]

What’s not strange to me is that they were both CNHL packs, considering one was damaged, the other was not, and they were purchased at the same time.. Just my .02..

But they both still run fine in other rigs and the new batteries are also cnhl Black Friday specials with lower specs

 

[Lostinthewoods86]

It would be nice if Lost had a datalogger to see a bit more about what is going on

I posted what I had off the cobra that had the problem. I don’t have Hotwire for the tekin that didn’t have issue and the mt8 doesn’t have it

 

[Suburban_Hooligan]

worked on the Losi XX buggy a bit. installed the DragonPunch RC chassis stiffener. then rebuilt the diff with a new NOS gear and rings. i need to find 1 part for the slipper clutch and ill have a complete car. (i think i have the part. if i don't i can make one)
the original gear

 

[WickedFog]

I posted what I had off the cobra that had the problem. I don’t have Hotwire for the tekin that didn’t have issue and the mt8 doesn’t have it

@Greywolf74 has some dataloggers he uses for his battery testing. I am pretty sure they generate more data than a Castle ESC does. But I don't know for sure.

Your graphs you shared might need to be displayed with the same resolution to get a good side-by-side comparison.

 

[Littlemotor]

I don't think the balance plug being ripped off actually damaged the battery. The balance wires aren't big enough to carry more than about 10 amps or so. They would have fried almostly immediately, and a 10A load on a LiPo shouldn't even make it flinch.

It would be nice if Lost had a datalogger to see a bit more about what is going on.

That’s exactly what I’m saying. I don’t think that either. I’m saying one had the balance plug ripped off, the other did not, and they are both doing the same thing. Seen it pretty often with the CNHL’s unfortunately.

 

[WickedFog]

That’s exactly what I’m saying. I don’t think that either. I’m saying one had the balance plug ripped off, the other did not, and they are both doing the same thing. Seen it pretty often with the CNHL’s unfortunately.

Greywolf has concluded their G+ series are good batteries. But their racing line is garbage. High IR's, voltage sag, etc. Just like a lot of the Amazon brands.

Maybe it is just both batteries went kaput at the same time. Maybe they were on the verge of not performing well enough for the truck, and maybe the short did cause something in the system to create a little more of a bottleneck somewhere.

Maybe you get some "bad gas" that clogged your injectors and now your vehicle gets 1mpg less from whatever gas you stick in it. Maybe the same thing is going on in the electric ciruit. Maybe it's not enough to cause better batteries to hit LVC, but the old batteries just can't handle that little bit of extra load. Hard to say without getting some good data. This whole thing has me curious as to what happened.

The IR's shown on the old batteries definitely wasn't great to begin with. @Lostinthewoods86 - what is your LVC set at in the Cobra again?