View Full Version : Mamba Max + Lipo cooked my Feigao 380c 8t
I ran my rustler yesterday. It was about 95*F. Ran it like I normally do. The motor usually gets pretty hot since I've got 7.4v 6400 mah. at the end of the run it was 277*F :eek: . Normally it gets to about 215-220*. I know that is pretty hot but I've tried gearing up gearing down. I mounted a fan on it which worked, but It ended up breaking into pieces.
Today I ran it half way through one pack then it started acting like a phase wire came off. When I opened up the can everything looked normal, but the magnet no longer had much magnetism. It's weird that it lost its magnetism so instantly. Well, time to open up the wallet again. I think I will get a Mamba Max motor this time.
tcolesen
08-20-2006, 07:23 PM
Generally 180 deg. is considered the max. temp. due to the loss in magnet strength at higher temperatures. But 277 deg.?!?! Are you sure there isn't something binding in your drivetrain? I had no idea such a high temperature was even possible...
ElectricThunder
08-20-2006, 07:28 PM
Whoa....that's HOT! :eek: I run an HV maxx and gear it 23/87 in my Rustler with 6 GP3300s (in a MEC SPT now) and my motor has yet to get above 135 after a full 15-20 minutes of just running in 90 degree weather.
Did you run until the LVC kicked in? Maybe it got so hot just from running it for so long, or due to something in your setup (like drivetrain binding, gearing, tires size, etc.). :eek: :eek:
No, nothing binding. I think just from long runs it would get to 210* to 220*. I think it got to 277* because it was already damaged at that point. I have an extra motor, I think I will try going up a couple of teeth again. It's at 18/87 right now. The 380c motors just seem like they run hot. The ESC is at 120* with a fan on it. I'm kind of hoping that the Mamba motors run cooler.
starluckrc
08-20-2006, 08:47 PM
I generally recommend the 6L for Ruslters and Stampedes as they tend to be heavier than the Associated and Losi trucks. The Mambas should work fine as well as the 540-S Feigao motors. Consistently running hot will demag the rotor. Best to keep it under 180 for safety.
chilledoutuk
08-21-2006, 12:21 AM
heat will build up in motors over long runs especially if there is not very good airflow.
For long runs i highly recomended using a fan to keep the motor cool as heat seems to always build over long periods even in light cars.
xhumeka
08-21-2006, 11:36 AM
I run the mamba max/feigao 7T combo in my b4 - I know it's lighter than the rustler, but it runs STONE COLD no matter how long I run it.
I took it racing this past weekend, and after a 5 minute qualifier/main with HARD DRIVING on a tight technical track it still ran stone cold. I didn't have a temp gauge with me, but I could hold my finger on the ESC or motor as long as I wanted without hurting.
It surprised me really, cause I'm so used to my ESC and motor being VERY hot from running a 9t team checkpoint motor - the fact that this ran so cool blew me away.
So I really think there must have been something else causing the heat, because I'm sure I could throw this combo into a Rustler and it wouldn't overheat.
I'm running at least 20 min all out flying the whole time with decent traction. Winter time hasn't been a problem but I've consistently been overheating in summer time and I just kept going anyway. Outdoor temps are very hot here too. 98*F is an average summer day. I run a similar setup up in a TC3. The temps are very cool "stone cold" like you say. So the weight must make some difference.
SpEEdyBL
08-21-2006, 10:29 PM
All you have to do is gear lower and the motor will act as if it's pushing a lighter vehicle. I wonder if it's the esc that could cause a motor to run inefficiently and heat up. When I eventually get a mamba max I will find out because my motors are all running hot on my mgm 12012 these days.
"Generally 180 deg. is considered the max. temp. due to the loss in magnet strength at higher temperatures. But 277 deg.?!?! Are you sure there isn't something binding in your drivetrain? I had no idea such a high temperature was even possible..."
No kidding, it's not like you've actually got any much world experience with high power BL systems. Reading message boards all day will leave you dry in real world experience.
"Generally 180 deg. is considered the max. temp. due to the loss in magnet strength at higher temperatures. But 277 deg.?!?! Are you sure there isn't something binding in your drivetrain? I had no idea such a high temperature was even possible..."
No kidding, it's not like you've actually got any much world experience with high power BL systems. Reading message boards all day will leave you dry in real world experience.
TALKING TO ME!!!
Ha Ha Ha. You are hilarious. I guess you are the NEW board joker. I'm guessing your the one with no real world experience. So you belittle others to make up for it.
I have been around long enough to know that I was doing damage to my motor by constantly overheating it. I choose to ignore it and ultimately it cost me a motor. Oh well. Stuff happens.
You seem to be so far above everybody else, why don't you go ahead and dazzle us some more with your infinite wisdom. We are all awe struck by you. Please tell us more about the dozens of lipos you own and the dozens of BL systems you own and the many years of experience you have.
billmck
08-22-2006, 06:03 PM
Muck - sorry for the ot
why not just ban him already....it would be justified according to the rules
tcolesen
08-22-2006, 06:23 PM
"Generally 180 deg. is considered the max. temp. due to the loss in magnet strength at higher temperatures. But 277 deg.?!?! Are you sure there isn't something binding in your drivetrain? I had no idea such a high temperature was even possible..."
No kidding, it's not like you've actually got any much world experience with high power BL systems. Reading message boards all day will leave you dry in real world experience.
I'm still curious why you think I am guilty when in a court of law I am innocent until PROVEN guilty?
I've got plenty of experience with high power brushless. Just yesterday i was out driving my Rustler withe the 4600 and 4s Lipo. Can't keep the front wheels on the ground with that thing.
Earlier yesterday I also had my first semi-normal run with my recently-converted PRP Swift (1/8 buggy, Feigao 8L on 4s LiFePO4 batteries, with Mamba Max ESC). It was fun to drive a BL 1/8 again.
Rtsbasic
08-22-2006, 07:28 PM
OT: What did you think to the Swift? I purchased one last year with the intent of converting it, but never completed it because I couldn't work out what spur gear I could use, and at the time didn't have a drill press for modifying the chassis much.
I'm still curious why you think I am guilty when in a court of law I am innocent until PROVEN guilty?
I've got plenty of experience with high power brushless. Just yesterday i was out driving my Rustler withe the 4600 and 4s Lipo. Can't keep the front wheels on the ground with that thing.
Earlier yesterday I also had my first semi-normal run with my recently-converted PRP Swift (1/8 buggy, Feigao 8L on 4s LiFePO4 batteries, with Mamba Max ESC). It was fun to drive a BL 1/8 again.
I thought his comments were directed at me. I still stand buy my comments and I also stand by tcolsen as well. He has helped me numerous times and many others. He is a good guy. JCSS, go bug some body else!
SpEEdyBL
08-22-2006, 09:04 PM
JCSS is just asking to be banned from the forums. So the more he posts, the sooner he'll have to leave.
ElectricThunder
08-22-2006, 09:16 PM
I thought his comments were directed at me. I still stand buy my comments and I also stand by tcolsen as well. He has helped me numerous times and many others. He is a good guy. JCSS, go bug some body else!
Seconded. Now quit frying motors...:D
billmck
08-22-2006, 09:25 PM
just to clearify my post...
i think that its very distracting to post the mud-slinging garbage and disturb the topic at hand, and im sorry if my post helps dirty up the place, but JCSS needs to know that its getting old!!!
tcolesen
08-22-2006, 09:44 PM
OT: What did you think to the Swift? I purchased one last year with the intent of converting it, but never completed it because I couldn't work out what spur gear I could use, and at the time didn't have a drill press for modifying the chassis much.
The details will follow in another thread. I just can't wait to see the reaction of JCSS when I post it if he's still around. :p
bxpitbull
08-23-2006, 05:22 PM
Man o Man and I thought I was the master of stirring up a hornets nest. JCSS has never come off pompous towards me, but to some of you other guys, he rubs you the wrong way. Oh well. Those with delicate feelings should refrain from speaking and running the risk of getting their feelings hurt.
neweuser
08-24-2006, 09:32 AM
From reading what he wrote it just sounded as though the real world is different than what is suppose to be "the specs" of things. Electronics are weird that way. You can get the specs of a motor and it's capabilities, but when you actually put it in a car or truck, it may not be that way all the time, i believe that is the point in his comment. Although, if it's said he's down falling all the time, then maybe well......there is always Traxxas! LOL Anywho, over 200.00 is way too hot imo, i never run my system over 160 at all costs if i can help it.
Man o Man and I thought I was the master of stirring up a hornets nest. JCSS has never come off pompous towards me, but to some of you other guys, he rubs you the wrong way. Oh well. Those with delicate feelings should refrain from speaking and running the risk of getting their feelings hurt.
While we are banning people, lets ban this guy too! :D (just joking).
I'm going to try a Mamba Max motor this weekend. I'm taking wagers. I bet it will do a lot better as far as temps go. I just don't think a 380c 8t can cut high outside temps and push a rustler around for 20 minutes. The lowest gearing I tried was 17/90 with no effect on the heat. It was still like 219* after a long run.
neweuser
08-24-2006, 01:54 PM
The mamba in a rusty should be great! Just not in like say, an emaxx!! Teh 380 c's run hot as it is....let me know how the mamba goes! ban me, i like getting into trouble!!!! J/K! LOL ;)