you must be in the 98.5% that CC claims to not be having any problems.

LOL

Hmm.. Then why would Castle be gearing up to make a package deal with a MMM and NEU motor???:whistle:

Vintage...I was running my v1 mmm on 4s w/ a 9xl and a cc bec. I recently switched to a 5s, reprogrammed the esc for 5s, ran it on short grass to test and it lasted 3 min before cooking the cc bec..

I did rewire the fan to the rx and cut the grill above the fan out.

I run the truerc cells and have tested them with my wattmeter on various setups. I have the 10C, 15C, 5000mah cells, 4000mah cells and the 8000mah packs at all voltages. I can honestly say the batteries hold their voltage very well, even better than some 20C packs I have bought. Its not the batteries. If anything these things hold their voltage so well you are getting some serious power to the motor. My BEC failed on my MMM. I think it probably had more to do with the dual servos than the batteries being the problem.

You keep saying that but I posted how you were not. You used batteries that were not up to the task and a hot motor that without the proper airflow puts you way out of spec quickly. Without a data logger how can you be so sure you were in spec, how do you know you didn't have much higher spikes?

You also need to research ripple current as was suggested previously in regards to the batteries you used.

Again a fire is not a simple bec failure, it is caused by overload.

Don't forget that an ESC is worked harder on partial throttle, so you really need to know
how much current is being drawn at full throttle/load and allow some headroom above
that regardless of how much trigger is used.

I said.. I agree with the Ripple Voltage being a possibility.. But there is more and more data popping up that supports that the Batts shouldn't have been an issue. You are right without a data logger. there is no knowing.. What I DO KNOW.. Is that they are BRAND and were never used Lipos. That the airflow is bunk excuse because #1 the windshield is cut open a fair amount and 2. I never got more than half throttle and didn't run long enough to even heat up the motor let alone anything else. It flamed while at a walking pace for about 5 feet. I HIGHLY doubt I need a data logger to determine if I exceeded 300Amps, etc.. Obviously.. something went wrong.. I think that is in agreement. My point is.. On Paper.. It shouldn't have cooked. Not that fast, under that little use... Not unless the ESC failed and not because, solely, of ripple voltage.

I only posted this here to share info.
I can be honest that I am tired of being a beta tester for this ESC. I have spent(as many have) a lot of money. I didn't cut corners to try and tape together a rig that should go fast. I bought everything that I could find that was in the upper ratings of being preferred stuff. I have maxamps batts, NEU motor, Medusa Motor, Phatlines, Badlands, Hyperion DUO charger, etc etc.. I have not abused any of my stuff as I haven't had a chance to really even run it for any length of time. I have spent countless hours resoldering connectors to eliminate any issues there.
Between BEC failures, Flames ESCs and all the other wacky crap with the MMM V2, there is obviously more issues than CC is admitting. I think the mere fact that 2 other CC techs have joined in here to collect data supports that they know there are issues that they know nothing about the cause yet.
Again a fire is not a simple bec failure, it is caused by overload.[/QUOTE]

This is just my opinion, but the only 2 times I fried speed controllers is when I tried to do something similar to this. I overgeared and overvolted a couple of setups and I let the magic smoke out after running them for several minutes. I think this setup stressed the speed controller and caused it to fail. I dont think it was your fault though. With specs like "more than you can handle", it is implied that you can do just about anything and the controller should be able to take it. I have also read that the more efficient a motor is, the higher the instantaneous peaks will be.

any pictures yet

I still think you had a weak fet in there and you gave it a decent workout and it let go. There are going to be some fet issues, just a fact. If the MMMs were not having widespread bec failures, the few smoked escs would just be chalked up to having a few dud components.

The battery excuse is crap, all you did was give the esc a workout and it let go. I did the same thing to a MM once on 5s. I have a 7xl in a buggy geared for around 40mph. I decided that I would try 5s and did not gear down. I got a rock stuck in the spur and the esc fried. I had griffinru look at it and he seemed to think that a section of solder got too hot and bridged 2 phases on the board. He seemed to think that there was a bit too much solder on there. So a rock and some sloppy solder work caused mine to fail, but it was probably getting quite hot from the overgeared setup too. A collection of things were at fault.

sure... here is a picture of my simple one piece drop in solution for running 1/8 brushless:sarcastic:

http://i66.photobucket.com/albums/h2...M/CIMG3454.jpg

I think I have as much time in putting this together as the last buggy kit I put together.

Mods (all within warranty I hope) : Fan hole cut out in case, case bottom has hole cut so the fan plug and coil dont hit, extra thick foam servo tape on the bottom to help cushion it from shock, external BEC wired on, extra 2200mfd cap added.

I havent even plugged this on in yet. I will run the last V1 I have until it fails and then put this in. If this one fails I am giving up on the MMM. There is nothing left to do to it within warranty.

It looks like FrankenESC....:tongue:

well when i get moine back when it blow s up i hope your ready to mod it like that one

I would have to admit that the caps the castle uses are undersized. Novak uses fair sized capacitors on all their escs. I'm not saying it wasn't an MMM related problem that caused the failure, but if you think about it, even though the truerc packs may be true 15c packs, thats still only 75 amps continuous. Castle claimed they saw 800 amp spikes in their setups during prototyping and that was probably with a 1y which is even lighter than a 1.5D. From my experience, I noticed a huge gain in peformance when going from 20c 5000 mah maxamps packs to neuenergy 30c 4100 packs. My novak hv4.5 turned into a completely different motor. It suddenly had more punch than my 8xl did and i could gear down 2 teeth on the pinion gear without sacraficing any top speed. Before I made the change, I totally judged the motor based on peformance since the packs were barely getting warm. Once one of the cells puffed, and then two more while the rest of the pack was sitting on the shelf, I soon realized that batteries are a HUGE factor in determining performance. This was only in a 7lb 8ight, so think of how much of a difference there would be in a monster truck that requires even more power for even higher speeds, with say 125 packs verses 75 amp packs.

SpeedyBL, You are right. Batteries do make a big difference. I had a setup on an 11.1V lipo and the wattmeter measured 10v dip on an 11.1v lipo. I tried a better battery and the wattmeter measured 10.5V dip. The total power difference ended up being 100watts. It was something like 550w vs 650w just from a different battery at the same voltage. I can only imagine if I had one of the neu packs, I could have picked up another 100w of power.

Jhautz, You should see the mtroniks truck esc. You have diodes and a cap all on top of the esc. Looks sort of like your creation. I like it though.

SpeedyBL, Thats a good point on the battery limitations. Even though the truerc packs are great cells, they are only rated for 75amps. Maybe as the pack drained a bit the cells had trouble keeping up wih the peaks and were no longer sufficient for this setup. I dont think truerc posts a peak for those cells either, but I think we can all agree that they would have exceeded what the pack could produce. Even their 10C 5000mah packs though outperform my 20 5000mah packs that I bought from another manufacture, but ya in this case it might have been asking a bit much.

Good info.. Thanks. Learn a little more each day.. with hopefully less fire! :)