I killed it... MMMv3 bit the dust
 

Well I received my v3 replacement about two days ago and fired it up today.......

e-revo
1515/1.5d
no external bec just the internal one
two 3s zippy 4800mah packs in series

it started right up the first time and hooked up to my futaba 3pm 2.4 no problem......like a charm for about 15min..... real fast and suddenly just quit...I had it set custom at 19.2 volts cutoff....low timing......everything else was default except for soft start...kept checking temps after every two runs....batts werre about 150 esc was about 170....motor 150


took it in the house and hooked it back up to my pc and couldn't get it to recognize the monster....but notices that programmer thingy got real hot


real depressing

Wow..... That is exactly what I did not want to here; a MMM v3 failure. Hopefully it was just a quirk.

Overgeared? MMM at 170 makes me think so. Your batteries weren't enjoying the punishment either, apparently.

That's the first confirmed death of a V3.

I think we are all just a wee bit over-sensitized to any MMM failure, but there are bound to be failures here and there, even with a solid product...

I too think the ESC was a tad hot, especially considering it has a fan. The fact that the link gets hot when you plug it in leads me to believe you smoked part of the brains.

24/58

no smoke or fire...just quit

Wow batts at 150* That is way hot for lipos.

hey man,
I'm gonna go out on a limb here and say that gearing a 12lb truck for over 70mph....
...you're only gonna be able to do a few speed passes before a need for cool down.:whistle:

dude:diablo: you're mean to your electronics.

Differential Ratio: 2.8461538461538462
Transmission Ratio: 1.8333333333333332
Other Ratio: 1
Spur Tooth Count: 58
Pinion Tooth Count: 24
Total Voltage: 22.2
Motor KV: 2700
Tire Diameter (inches): 5.9
Tire Ballooning (inches): 0
Motor Current Draw: 120
Motor coil Ω: 0.004
Spur/Pinion Ratio: 2.42 : 1
Total Ratio: 12.61004 : 1
Tire Circumference (inches): 18.54 inches (470.8 mm)
Total Motor Speed: 58644 RPM
Vehicle Speed: 81.63 mph (131.12 km/h)
Estimated Adjusted Speed: 72 mph (116 km/h) - 11% loss
Effective KV Value: 2641.62
KT constant: 0.5 oz-in/A
Motor Torque: 0.31 ft-lbs
Final Torque: 3.95 ft-lbs
Final Power: 2664 watts (3.6 HP)


not to say I wouldnt still hold the camera and wear the shin guards:lol:
call me up if you need a videographer!

Jesus!!! And I though my 1521 1y on 6s would be a bit much... The tires must have been 8" diamter minimum at those speeds...

Just for comparision I run a 1515 1.5d in my erevo on 4s lipo geared 19/50. It does over 40mph and never breaks a sweat. It does work a pair of trakpowers pretty good though... I have a pair of fp 4s 3700 packs that I plan to run in parallel, that should provide plenty of juice.

yea, a 1515 1.5d on 6s is a bit much...ESPECIALLY AT THAT GEARING!

I run the 1515 1.5d on 4s with 24/62 is goign 45+...

and are your batteries the 15c zippy? sounds like they are COOOOKING

yea overgearded BUT a MMM should shut itself off if it gets too hot no matter what is going on wrong around it.right?

Ouch, that sucks. Those temps are way too hot, though! The MMM doesn't thermal until it hits around 220F, but judging by the temps of those cells, I'm thinking that maybe ripple voltage killed the MMM? They must've been really struggling to provide the current required to get that hot, so the first thing that comes into my mind is bad ripple; and Patrick has said before that high voltage ripple from overstressed LiPos can kill an ESC.

Just an idea, but given that there haven't been any other V3 failures...I'm not sure the MMM is at fault here.

My only question is why stress a speed control only hoping that built it safety features save it? Asking for trouble if you ask me.

Those 4800 packs are 25C const. and 35c burst I believe? I'd say you were definitely punishing them! That thing had to be a bullet on wheels while it was running....

I'm going to have to side with the others here. Running a 2700kv motor on 6S and gearing for 80+mph is just crazy.

I concur, you are looking to fry something at that point.

any gearing that will bring lipos up to 150 is way to high.

HA...this from a guy who opens his beer bottles with his MMM:tongue:


she handles like a dream though....flew over the speed bump like a bird and landed like the space shuttle

just hoping that its castle link that has broken down, not the monster...

I'm going to blame it on Larrydino over at traxxas....I was trying to win the $20 for the first guy to hit 70 with the mmm...not really for the money...for bragging rights mostley

anyway ya I wont be trying that again

hmmm....you think that could be possible?.......I will try another one

I don't think it is the link, when my v1 died it did just that, heated up the castle link. that link still works fine to program my mamba25

"I'm going to blame it on Larrydino over at traxxas....I was trying to win the $20 for the first guy to hit 70 with the mmm...not really for the money...for bragging rights mostley

anyway ya I wont be trying that again"


Hmm.. maybe you should have provided this info in post that started this thread..

Did you pop the case and make sure the fan wires didn't get shorted together? It's worth checking to see.

been trying to figure out how it opens ..but those wires sure look squeezed

why?

You should just have to pull the label off and depress the tabs on the sides for it to pop apart.

I with the rest, I think this one is the fault of the "ahem" user and not the MMM. :na:

I am glad I am not a speed freak, it keeps me out of trouble. :diablo:

Bustitup,

The title of this thread is somewhat misleading based on what took place. I'mean sure, the MMM "bit the dust". But most who chimed in (myself included) think that your set-up was bit extreme.

I like to push the limit on some things, knowing the results could sometimes mean complete failure. Heck, I've been told that I have this weird sadistic laugh when one of my "experiments" goes awry. Still, I'm the first to admit fault when doing so amidst the carnage.

At least he lived up to his name!

I'm with you.

This is definitely a case of operator error.

The title of this thread should read "I Killed My MMMv3"

:oops::whip:

If possible when you send the Monster in, put a note in it for them to send it straight to Mike. I am curious to see what failed. We have been pushing these things in some really extreme setups for the last couple of weeks with no failures. (other then broken cars from driver failure :) )

I thought y'all had stopped letting Patrick drive! :lol:

Will do sir....you guys are the greatest


can a mod please change the title of this thread to "I killed it"......I would say its my fault also but you would think if the esc only got to 170deg. that it should have lived?

We only let him drive when he holds that "I'm the owner of the company" thing over our head. :rules: We did figure out that doing 60+mph speed runs in a small parking lot full of cars is kinda stupid. I have had to replace the front end on our RC8 conversion 3 times in the last couple of weeks.:oops:

Not sure how you was getting the temp readings, but if you was reading 170 outside the case it was probably way over that for actual temp. Still should not have failed for that reason though. I would guess the overstressed batteries were more the factor then anything else. Send it in and I'll figure out what failed on it and get you fixed back up.

well I'm making an attempt to see if the wires are pinched....I took off the bottom label sticker and there is an oily rust colored residue seeping from the seams of the esc....but I still cant figure how to get it to pop open ....I dont want to break anything

How's that?

used this mike PE1 INFRARED THERMOMETER TEMP GUN

take a look...see the oil droplets on the cover and the inside of the case has like a sandy gritty substance...you can see it good on the wires where they run out the case

http://www.rgcbuilders.net/esc.jpg

http://www.rgcbuilders.net/esc2.jpg

Wtf?