Blown MM, MMM upgrade?
 

Hi, I have been running a MM in my lightning 2 pro 1/8th buggy for a long time now and although it runs very hot even with a fan It has been very reliable for approx 250 runs until now.

I was running on road in front of my dad's house, and towards the end of the run the (ESC) brakes failed and I crashed headlong into a kerb at near full speed, trying to drive away did nothing, not sure if the ESC died leading to the brake failure and crash or if it just thermalled (for the first time, but by how hot it ran I couldn't have been that far off) causing the brake failure and the impact of the crash broke it whichever way round it was it doesn't work any more.

It's over a year old and I ran it on 12 cells originally then 4s, so I know it is not under guarantee, here is the rub, getting castle products locally is not easy and RCM is out of stock of MM, but even if it was in stock its $135 and he has the MMM at only $145, Even before my MM went south I was tempted to get an MMM when the wait (first for the MMM then for a reliable version) was over to bring the temps down, but now the time has come and I've seen that lots of folk have been having problems with the internal BEC even with V2, I have a UBEC that I used with the MM and don't really have a problem with doing Brian G's mod and continuing to use it with an MMM, IF the MMM is otherwise all we were expecting it to be.

I'm sure there are plenty of people that have upgraded from the MM to the MMM, if anyone had an MM that was fan cooled and still running hot like mine and you swapped it for a MMM with no other changes did the MMM run cool? or was it still hot? or with that case all around it and fan on the top is it too hard to get a reading of the heatsink so you only know what the case/fan temp is?

I will be using it on 4s for now but plan on another vehicle at some point that will want more voltage, Is it really good for 6s or is it like some previous "6s rated" controllers from other company's that gets very hot when actually used at 6s.

Castle replaces or repairs the MM for $50 no questions asked even if you pluged into the wall socket to power it and it fried. So dont just throw it away. Send it in and get a new one.

That said RCMonster sale on the MMM at $145 its pretty hard to resist.

I would do both the things jeff suggested - Flip the MM back to castle for repair and buy the MMM from Mike!...

I will say that i have run 4s setups with the MMM that the MM would not be able to had, even with the mods (fan ubec, extra cap, etc). It really is a good esc, just the bec problems have tarnished it a bit. I have 3 MMM at the moment, a V1 that still runs fine (on 4s and a 1515 1.5d in an erevo, about 3-4hrs on it), a V2 that I had to do the BG mod cause the bec died (running 6s in an aftershock with a hacker c50 11xl, and soon to be used with a 1521 1y). I have not used the 3rd for more than a few mins, and it seemed to work fine...

I would say to send the MM in for repairs, and order the MMM from Mike, just as jhautz recommended...

Hmm, I only have 1 brushless car at the moment so if I get both I am either wasting $50 getting the MM fixed or $145 on the MMM plus the postage, unfortunately I need to keep an eye on my expenditure so I still have some money to build the Fast Electric model boats that are my real passion.

send in the mm then resell it.

that way you will save some money buying the mmm from mike.

?

I say just sell the MM broken to someone and tell them its broken. People like to tinker with them. You will still get money for it and use it to pay for your MMM.

Thanks Tmaxx, why didn't i think of that.