mmm + fiegao + Nue + muggy = hot hot hot
 

Ok im new to posting, but have read just about every thread i could for the last yr or so.

I am not new to brushless conversions. I have about 9 or so under my belt.

Here is my problem:
first conversion on muggy:
stock losi muggy
fiegao 10xl
12t pinion
max amps 5cell 6000mah lipo
MMM

This resulted in fried motor on second run. (smoked alot) The motor and RCM heatsink was so hot i could feel the heat from about 5 in away.
The first run was smooth, the motor was hot, but nothing hotter than what the fiegao normally gets.(i have had a few of these motors)

Battery was hot also. Sorry not temp gun.

So at this point i just thought i had a bad motor so i emailed Mike, but he seems to be busy. So no problem, i ordered another motor. This time a Neu.(from another site, mike was out of stock)

Setup #2.

Same as above ,but now with the Neu 1515/2.5d with out fins.(only one i found in stock)

Now i took it out and felt the motor every min for 4 min. The MMM fan kicked on and stayed on within the first min. The motor at end of min 4 was just hot enough that i could only hold my hand on it for a few seconds.

This is my problem.
There is no binding rolls smooth.
Pinion is set perfect.
The pig comes in aroung 12lbs.

MMM settings are set to low everything.(i thought it would run cooler, i could be wrong)

Any help would be great.

Oh yeah, both setups are as per MIke. So i trust them. ???

Michael

Try a 10t pinion and see if that helps temps...

What about MMM settings? I have read people running this setup with great success. Are my setting correct at low or should i set them high since i now have all highend componets?

I usually leave the settings at all stock settings.

Well Neus don't really like much timing, but you could try to raise the start power see what happens.
Oh and i like your Av pic funny stuff.

Think that may help? LOL

my first love is heli's. Yes there is a heli in my Av. LOL

my timing was set to low (0) its now set to normal (10) (stock setting)

Ok i just got back in.

Changes-
start power to medium.
all other MMM set to stock

4 min run and i could only hold my finger on motor for a sec or 2

MMM fan was running during most of the run. ???

What weight oil are you running in the center diff, and do you notice the front tires ballooning much more than the rears?

Also, what tires are you running?

The center diff is almost locked. When it had 30000 wt the front tires would balloon like crazy and it would be like a front wheel drive truck. LOL

I think they are stock. (bought the roller used)

I don't know much about a Muggy, but does it have a center diff? Brushless has a lot more torque than a nitro so it is much easier to have the front unload a lot on take-off. This basically unloads the motor to where it spins relatively unloaded making it hot. I would try some thicker oil in there, 50k as a minimum IMO.

That could explain motor temps, but not ESC temps. That usually means you are overgeared when both are hot. Have you tried gearing down as Lincpimp suggested? You may not like the resulting lower top speed, but it's a place to start.

Also, I would set the punch control as high as possible before you don't like the loss in take-off punch. This will help tame that initial high current burst and should lower temps.

Usually, in such a heavy vehicle, I would suggest 6s on a 1800kv motor, but that combo you have should be perfectly fine geared right.

I used the super heavy diff locker stuff. (doesnt fully lock it, but its pretty good)

I just upped my punch control to 50%.


The wheels are stock but the tires are not.

Just as a small test of the MMM fan, i just flipped my buggy over and ran it unloaded till the fan kicked on. (not to long) The fan kicked on for about 15 sec and shut back off. So its working right.

more testing tomorrow.

Thanks all!!:wink:

Looking at the motor, on 5s it is spinning at 30k max. Seems a bit slow to me. I prefer a higher kv motor on a heavy truck with lower gearing. Seems to work better than a slower spinning motor with high gearing. The muggy has quite high gearing stock, nitro users have clutch problems due to the load of the heavy chassis and tires. Diffs are 11/45, but it really needs a bigger center spur, at least a 50t like the hb lsp truggy...

Mike recommed this setup. I may go with the poline tires and rims to save some weight.

Also, check all of your connectors, battery to esc, and motor to esc. If you have a bad connection somewhere it will cause more resistance, heating everything up in the process...

Get a temp gun, it may not be as hot as you think. And as Linc said a bigger spur helps. I run 48t in my Muggy.

which spur?? Linky please

The motor and gearing sound fine to me(I run a nearly identical setup in my truggy) - only 38mph or so on 5s isn't asking for too much. I would look elswhere as the pimp suggested(solder joints, etc.). The fact that the fan on the mmm comes on after a very short period of time with no load indicates to me that something is amiss somewhere. Others are running for 15 minutes with the fan never coming on.

Also - the proline tires will help - the muggy tires are large, heavy meats and suck up a lot of power. You could easily lose a pound of rotating mass, which will feel like 2 pounds to the motor and controller in terms of their work load. :)

I just checked every thing. All seems well. No soder joints or deans got "hot" ??

I just got back in from a late night test and well lets just say i forgot to loctie the grub on my pinion. LOL

I have the punch control set up to 60% i think and she seems driveable now. But i only got a couple of min. But nothing was hot in the couple of min. LOL

More testing tomorrow.(not 15min tomorrow, 8hrs from now. LOL)

waiting for me at my LHS. $97 for rc tires and rims:surprised:. lol You gotta love this hobby.
( i do)

It is the 48t spur for the Losi 8ight-T, it may take some filing around the chassis opening to fit in the stock chassis (I have Innovative-RC chassis designed to use 48t spur).

And I run 40 series bowties, which are smaller and lighter than the stock wheels/tires.

Ok tested this mourning. Still getting hot, esc not so much. Motor is still hot darn hot after about 7min.

No go on the wheels, they were the 23mm wheels. errrrrrrr

Took wheels off and weighted them.

RTR muggy w/o wheels- 9lbs 1 oz
rims and tires. 4 lbs LOL wow!!!!!!!!

Anyone know how much the proline tires weight?

I use the 23mm wheels (need hubs as muggy has 20mm stock).

I have one set of 40 series bowties that weighs about 9 oz each and another set about 10 oz each (different wheels). My stock muggy tires/wheels weigh about 12 oz each.

as per pm, i am going with truggy wheels till i get my 40's.

proline velocity with badlands and 17mm adaptors. Only $67 shipped so its worth a try.

I have been thinking about trying the badlands myself as everyone seems to like them (i already have the 17mm hubs for my Phaltlines).

I had badlands for my Baja 5b and i liked them. SO i thought i would give them a try.

I don't know really, i would have to see your helicopter avatar closer.:lol::yes:

too much heat often comes from a under rated li-po, and you can fix it without buying a new battery, and if you keep doing what you've been doing with it, then you probably won't need a better battery. The new wheels and tires are going to help a ton, they're the same kind i have, but you'll also want a better spur gear. 48T 50T

with a monster like the muggy I think that you should consider at least a 6S pack for your next battery, but not a maxamps, lincpimp said he's had 12 different maxamps batteries and he's had to send them all back, he recommended for me to go with anything that uses enerland cells, I think you should too, he said that any flightpower, neuenergy, thunderpower, polyquest, or poly rc pack will be exceptional, they use enerland cells. This is the one i'm getting: http://www.amainhobbies.com/product_...ducts_id/17987

Edit: and that is a truly awesome avatar

I have 6 cell 5000 tp v2 for my heli. But i like to have seperate lipos for each vehicle. This way i can keep track of the cycles and how hard they are used.

I think my maxamp is rated for 120a. All i used to use is them andi never had a problem. Then again, i never used one with the MMM.(power hungry S.O.B.) Only the MM.

I just clicked your link. LOL I have 3 of those TP for my heli. LOL

lincpimp also mentioned that the maxamps are usually optimistically rated, and even though it says 120a, it Probobly isn't really living up to that. You ought to try your tp in the muggy

I guess, but its against my lipo beliefs. "One lipo, one use" :lol::rofl:

Hey your in pa. Me to, Pittsburgh!!

sweet, we're like 5 hrs apart!:lol::rofl:

meet ya half ways. LOL Muggy must be a PA thing. LOL

what charger do you have?

Tp 1010c/210 and 205 balancer and the tp 610 for all my small stuff.

I dont use the 205 if you know someone who needs one.

that's what I just ordered, the TP1010c and 210 balancer