mamba monster issue

[CerberusVI]

So a while back i had a mamba monster that i had sent in for warranty replacement. I received a new one back, re-soldered my CC bullets, stuck it in its box and its been sitting unused for 4 months now.

I finally finished the project it was going in the other day and was doing some testing. Ran it on 5s with a turnigy 4168 2650kv motor and it ran fine with no issues, but my motor hit 170F and i stopped and put the truck away. Tested it again and the motor got hot again. Each time i ran it i only went for about 5-7 minutes.

I then took the CC1520 out of my truggy and tossed that in. I ran it once with no issues except traction, again 5-7 minutes. I swapped out the truggy tires and put on some big joes on i had.

Now i get really bad stuttering when i try and drive it. I can pull the throttle it moves 2 feet and stops, pull it again same thing. I recalibrated the ESC, Rebound my radio, tried a different receiver, Pulled the 1520 apart to inspect for any damage (Its brand new), No damage. I know your not supposed to do this, but without the pinion I'm able to rev it. as soon as i toss the pinion back on stutters. I've even tried with and without a servo. Took the motor out, Drive train spins freely, center diff spins fine, both front and rear diffs move freely and rolls fine also.

I don't know where to go from here, It had Firmware 1.32 on it when i got it back and that's what i had been running. I then downgraded to 1.24 and i still have the same issue. Thoughts?

Mamba monster V3- 1.24
CC-Neu 1520
Zippy 6s 5000mah 40C

[bdebde]

try the latest... 1.38?

[FG101C]

Does it only do that when the big joes are on? Maybe try to up the start power setting.

[_paralyzed_]

The fact it happened when you changed to big joes (larger diameter tire, higher overall top speed) tells me that you are geared too high.

Use a smaller pinion or switch back to truggy tires.

The high temps on the 2650kv motor also point to too high of gearing.

You should gear for a top speed of about 45mph or you will have temp problems with continuos running. Anything above that is considered "speed runs" and requires cooling down between runs.

[CerberusVI]

It did the same with the truggy tires, forgot to add that. I'm geared 12/51 and I have no smaller pinions, my diff ratio is 3.308, weigh maybe 10lbs? And iirc geared for low 40s

I'll try start power and then try a different firmware when I get off work tonight. Also I ran the turnigy motor on 5s and my truck is way to big for that little of a motor is why it got hot, I was just testing out the system and new back up motor.

[_paralyzed_]

I'd double check all of your solder connections. One bad solder joint can cause these problems.

Could very well be as the 1520 would pull a lot more current and highlight any bad solder joints...