MMM v3 flameout - 2nd drive EVER??? :(

[primus95]

Hi All,

I am gutted, this is the second drive of my 8ight-T and the MMM has burst into flames about 5 mins into my second drive EVER?

I test drove my car this morning and checked temps twice to make sure everything was running as expected, temps all OK (motor ~150 at hotest spot, ESC & lipo ~ 100), documented in my thread in the Truggy forum.

I took the car back out this afternoon and after about 5 mins of driving, getting the feel of it, and the car stops, then smoke and flames. I freak and run to pull the car apart thinking the lipo's puffing (as all temps were OK this morning) and check this out.....

battery wire has completely un-soldered from the ESC.....something blown in the ESC????





My setup was MMM 2200 combo, 14/48, Neu 5s1p 6500mah Lipo

I've sent an email off to castle support & repair as I'm in Australia, otherwise I would ring them. Is this a common thing?? I've been reading for a long time prior to my build and beleived I had a fairly conservative setup with a high quality lipo and all would be OK???

[slimthelineman]

bummer dude dont feel like your the only one. i had a v2 that lasted long enough to turn it on and set the car down on the floor before it died. yes its frustrating but castle is great at taking care of their customers who have legitimate problems. setup sounds good to me but how long does it take for you to hit those temps? just to be safe i would check for binding in the driveline and all your connections good luck!

[Snipin_Willy]

You are not alone. I had one burst into flames and the cables desoldered just like that. It happened within the first 5 min my truggy's maiden run.

[suicideneil]

Hmm.

Setup is for ~47mph, fairly fast but not unreasonable by any means.

I agree, check for any binding in the drive line and gear mesh, but this looks like another random failure for no particular reason...

[primus95]

Originally Posted by slimthelineman

setup sounds good to me but how long does it take for you to hit those temps?

I hit those recorded temps @ the end of the 6500mah pack. The only temp that seems a little high is the motor but I got different temp readings all the way along the can in the range of 50 (front of can) -65 celcius (rear of can) which is 133-149F. Wasn't quite sure which reading to use, so used the highest and also used Castle's recommendation of "Never allow the motor to exceed 170F during runs"

Originally Posted by suicideneil

Hmm.

Setup is for ~47mph, fairly fast but not unreasonable by any means.

I agree, check for any binding in the drive line and gear mesh, but this looks like another random failure for no particular reason...

Thanks Neil, realise it was geared for around 47mph but also thought that if temps were in check then this wasn't an issue. No binding in the gear mesh from engine to centre diff, very aware of this process after owning a Rustler VXL for 18 months. I'm not sure how hard it should be to turn over the front and rear diffs from the centre diff of a truggy however, I have no other car to reference here?

[primus95]

Originally Posted by Snipin_Willy

You are not alone. I had one burst into flames and the cables desoldered just like that. It happened within the first 5 min my truggy's maiden run.

Hi mate,

Was yours replaced under warranty and how was the next one your received?

[suicideneil]

With the pinion moved away from the spur, you should be able to roll the truck along back & forth in a smooth motion, no jerkyness or sudden stopping when you let go- it should roll to a gentle stop if pushed across a hard floor for example.

[primus95]

Originally Posted by suicideneil

With the pinion moved away from the spur, you should be able to roll the truck along back & forth in a smooth motion, no jerkyness or sudden stopping when you let go- it should roll to a gentle stop if pushed across a hard floor for example.

Excellent thanks for explaining that , yep does that no problems. I though I might have to like manually rotate the spur in the centre diff and guage it like that. I bought the truggy second hand but based on the bottom of the chasis it looks like it had like a single race meet in it. I pulled all the diff's apart and inspected all gearing, then refilled with diff oil (7/30/5).

cheers

[emaxxnitro]

yeah i had mine die this weekend too. bad week for mmm's

[primus95]

what went down with your's emaxxnitro?

[emaxxnitro]

same thing

[Semi Pro]

Originally Posted by emaxxnitro

yeah i had mine die this weekend too. bad week for mmm's

sad


my buddys v2 died last nite and took his bran new lipo with it

[primus95]

Originally Posted by Semi Pro

sad

my buddys v2 died last nite and took his bran new lipo with it

How many cells were you guys running when it smoked?

[fastbaja5b]

I'm starting to think that over 4s lipo the MMM is simply a

Don't get me wrong, great unit if and when it works, but we're now at the stage where you need to bring a fire blanket and extinguisher with you just to run your r/c

Any other toy on the market would have consumer protection all over it like a rash.

I've had 2 * Sidewinders, 5* Mamba Max's all have been brilliant, but I'm nervous about running my Flux, even on 4s!

Although think yourself lucky compared to this one:

[suicideneil]

Thats not an MMM though, looks like a Castle boat or plane controller that was pushed too hard