RC-Monster Forums - PLEASE HELP ME!! (pick out setup)

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- - PLEASE HELP ME!! (pick out setup) (https://www.rc-monster.com/forum/showthread.php?t=20812)

Just try a new battery... Might cure all of the esc heat issues.

Quote:

Originally Posted by E-Revonut (Post 287982)

Well you already have a mmm right? Even if it's out of warranty it's $70 to get it fixed. A neu 1521 1y is $275 new, so for $345 you'd be set. The rx8 combo is the same price but doesn't come with the hotwire, that's like an extra $35.

My MMM is for sale no matter what; I know people love them and they work, but I'm just tired of it. Yes, Castle is a great company, and yes, Patrick always does the right thing, but no, mine never really worked, AND it took out a $135 servo with it once. The MMM literally MELTED a Futaba S9351! Turns out I don't really need hotwire - I now know what it does, and I just don't really need all that.

As for pricing, I figure I can sell my Tekno Neu and MMM (it would be a new unit) for about the same price as an RX8 combo.

Quote:

Originally Posted by JThiessen (Post 287991)

I think you are looking for a technical excuse to buy yourself an RX-8. Nothing really wrong with that at this point - we have all done it when something new comes along. I'd just hate to see you posting on here in two months with the same symptoms on your new system. I too am tempted to come up with a reason to buy one of them!:intello:
You have been given many examples of similar setups that run the way you want yours to, I think maybe the key is driving style as you seem to run yours somewhat different than most of us. I'm also suspicious of when you stated it really is dependant on ambient temps. Unless you are running in 100+ degree temps (and on hot pavement) for an extended period, it shouldn't put your system into an overheated state. I havent re-read the thread to check this, but how well is your body vented? Maybe its something as simple as that? Try doing a few runs with the body off and measure the temps.

Like I said in my pm to you, my Flux runs very well on 6S, and its about as close as you can get to weight and motor set up to your muggy, and its geared for about the same speed.

You're right; sort of. It's not that I'm looking to buy the RX8; I'm looking for someone to tell me I shouldn't, and for what reason. I'm DONE with the MMM! I suppose I lack the patience of others? And don't worry, if I'm posting about the same crap in 2 months from now with the RX8, NASA's telescopes are gonna see my Muggy flying into outer space after I punt the damn thing!

My body is not vented well; I can't keep a working MMM long enough to start playing with that stuff. It does need to be vented. Temps aren't too different with body on and body off. Also, I can't comment on how much ambients have truly affected my temps, as I rarely have a working MMM. In 12 months of initial ownership, I only have maybe 10 packs through all 5 or 6 controllers.

Quote:

Originally Posted by mk351e (Post 288069)

You're right; sort of. It's not that I'm looking to buy the RX8; I'm looking for someone to tell me I shouldn't, and for what reason. .

And we'd be hard pressed to give any valid reasons to not get that system - looks great so far. I've seen your frustrations with my B'in Law and his HV system - its hard to keep him patient, and help him keep his costs down. It's definitley very frustrating to have gone through the issues you have. Hope it works out....

You want frustrations? Try electric boating... LOL I sold off almost all of it because of the frustration and wasting of money...

Good luck with your setup!

Having one, maybe two ESCs go bad could be attributed to faulty units (especially if they were v1 or v2). But more than that and I'd start looking really close at the setup itself and maybe even the component choice. Heck, unless I know the specific cause of a failure, I'd be taking a hard look at the setup after one failure. The MMM is rated for 120A @ 6s, with higher current bursts. That's a lot of power. But if some other part is causing them to burn up/go bad, chances are the same thing is gonna happen no matter what you get.

If all components are fine, and it's just a matter of really high currents, then I'd say to step up to an 8s+ ESC with the proper motor kv to match. That way, you get equal or more power with less or equal current. High current is the killer; it creates more heat (losses) which can be difficult to shed with low airflow and/or high ambient temps.

Your trouble could simply be a combination of a faulty ESC or two, low airflow, and maybe overzealous gearing. Each one of those not enough to cause a failure by itself, but together...

Alright, so I had a close look at your gearing and whatnot, and it is on the high side. However, I can't see that destroying 6 MMMs. As said, the setup is used in other places with success (tho is aggressive.) The MMM is good for 2500W or so, and lots alot of power.

Something else seems wrong, either a truck issue, setup issue, or driving issue. I would def get a ET to look at the power levels. I would def turn punch control off and learn to use finger control and even radio settings. Be triple sure there is no binding, and that there is not something else wrong, like way too light of oil in the C.diff causing too much unloading. You just can't fubar that many MMMs so fast with what you are doing (as least as it looks on paper.)

One thing that is often overlooked is extreme servo draw due to improperly set epa or binding in the steering system. Remove the pinion, power up the truck and try to manually roll the truck while holding the steering wheel full lock both ways. Also set you epa so that the servo is not pushing the wheels past the travel. A faulty servo can also overdraw the MMM internal bec. I have seen this happen 1st hand. Try removing the red wire and then powering the rec/servos with a rec pack.

Well, I will try to talk you out of the Tekin system. First off, I love Tekin stuff, I used to run that for racing as I never had any love for the "other" guys. i also am looking at the new Tekin system for another project (certainly not for my Muggy). I know you say you don't want to spend the money on a HV system and 1521. If you get the Tekin system and have the same problem, you will be spending more money than doing it right the first time (hv and larger motor).

As others have said, check the rest of the rig for problems. Too light of center diff oil can cause a lot of heat in your electronics.

I was thinking about this today (again), and considering which system I am going to put in my 8T. I could pull the MMM/Neu out of my Revo, and use it. But now-a-days everyone and their mother has a MMM/Neu. One of the neat things that "we" used to have was a uniqueness that has now been lost with the spreading mainstream popularity of brushless.
So for me, getting the RX8 would only be a step towards being "unique" again - not necessarily for any performance improvements.