Couple of issues wih my Mamba Max

[Serum]

'The problem is, the sensor doesn't monitor every part in the esc.'

Nope, that's a fact. an immediate temperature rise isn't coming from over gearing though.. many other factors might give an immediate rise in temperature.

I drove my schulze 18.97 with bigmaxx on 16 cells geared for 115 km/h.. guess what.. No thermal, and no burned esc.. (surprising, since schulze jumps every occasion it can to burn..) With brushless you never know..

Best way to monitor your system is by observing the amps it takes, the temp of the speedo, batteries and motor..

But Hippie; i personally think it's either your esc or your receiver that is giving you your head-ache..

It will cause an imediate increase in temperature from overgearing. LOL.

Tell me your setup you are currently running Serum, the highest voltage system you have right now thats ready to run. Tell me your current gearing, I will tell you the gearing to run and run one pack through it. If you are correct, everything will be fine and you will get a thermal. This will be an excellent test, please get video as well. This will end all question.

My personal tests ( to compare to your results)
1.Aveox -overgeared, 6 cells, no thermal, smoked. Regeared for replacement, ran excellent.
2. Hacker- overgeared, 12 cells, thermalled several times, smoked
3. Shulze 88ce, 10 cells, thermalled dozens of times, never smoked.(BEC overheated)
4. Hacker- battery bar broke on dually, single motor overgeared, smoked
5. Mtronik truck- Rx wire unplugged on dually, single motor overgeared, smoked
6. Mtronik truck- Rx wire unplugged on dually, single motor overgeared, smoked
7. CC Barracuda- overgeared, ran 2 minutes, smoked
8. BK 3095- overgeared, burnt high end FETs, wouldnt get full throttle over it overheated, melted shrink wrap, never thermalled.

[Serum]

I don't know what your point is bomb, but i don't like your approach nor your attitude. (this is my opinion, judged on other posts you made, and this last one)

I won't bother going into this useless discussion with you. (with you it's more of a monologue IMO) To remind you; I told you that preventing an overgearing is better than running it. But there is a difference in OVER gearing and overgearing.

BrianG has made a neat calcultor to help you preventing overgearing. (if you used it, you probably could have saved quite some of the controllers you listed) (it also includes a neat warning feature if your motor is running at a high RPM)

But in this movie i had my savage geared 26/47 on 16 cells. (115 km/h) Guess what, the controller survived.

The reason why controllers burn, due to overgearing is because they current it needs to handle is too big. It doesn't overheat, it simple hasn't got time for it; it's just used beyond specification. if a fet is pushed beyond it's specification. Another problem with fetts and the earlier controllers, is that when they where rated at a 20 degree C temperature. If you take a look at the datasheets of most fetts, you'll see a drop in current it can handle when the temperature goes up. if a fett does 50A at 20 degree, it's not odd it does a 15 at 60-70 degree C or such.

As far as i can see, the setups you used aren't very capable of high currents.

I am sure that if i used 2P 16S GP3300's on that setup (bigmaxx/18.97) it would have burned.. No doubt..

If you would have came here in the first place and asked what gearing you needed for the listed vehicles many others, including me, would have helped you with picking the right motor and the right gearing.

Now, if i ever need help in ruining a controller, i know who to contact now.

this is a nice guideline to determine if you are on the right track.

Its quite easy to take a off the shelf vehicle and a proven combination(such as a castle motor/esc combo) and make it work, and find gearing that works.
However, when you build a custom vehicle from scratch, you have nothing to go by. You can ballpark it, and judge weight and get close. But, most of these were smoked before anyone was running brushless, in any ground vehicles. In 1999, you couldnt go on a forum and ask what gearing to run. We had to start somewhere. Chances are most of you guys wouldnt be running brushless had we not spent all the R&D for the various companies. We brought the cheaper Feigao motors to the market. Before that, you couldnt buy a brushless motor below $150. We have been pushing the limits to push the industry further. We are the reason ultramaxxed gears came to be, we did the R&D for them and we gave the specs of what they needed to be.

I agree, try to avoid a thermal at all cost to prevent a failure. But you are giving false information reguardless if you believe it or not.

I dont know you from Joe Schmoe, I dont have a thing in the world against you, or anyone here. I see some good info you give, and some that I know are false...and this one will cost some kid hundreds of dollars if he trusts your theory. So I felt the need to correct it. Sorry to get off track Hippie.

As far as saying I need help gearing....I am sure HiAmplidude,305997,EmaxxJeremy and Promod need the same advice. We have all smoked similar systems at about the same time. We did get an e-maxx to 40,50,60, and 70mph before anyone else though.

[Serum]

I don't think the information was false. You know Hippie too, it's not his first BBQ either. and that was the person i was talking to in this thread, and putting your false information down that if it's overgeared, it will burn.. It's not like that.

His gearing is not completely wrong, or too high.

One thing i want to get straight; if a UBEC fails, it doesn't mean it will start glitching 100 percent sure. (and that's exactly what you say, which is plain rubbish/false information) and obviously, you feel too experienced to take anything from anyone else. And that's exactly my point.

Now back on-topic, because this is something we won't get over anyway, and it's not helping Hippie in what way ever.

My goal is to help others when they have got a problem, and i hope you have got that same intention.

these words passed here before, this forum is not about bragging about what you achieved, or bragging with your knowledge, it's about helping others out.

if you change the frame on a vehicle, i don't call it 'built a custom vehicle from scratch' it's just a conversion, and if you look around here, you will see many, many others have converted an awful lot of vehicles with great success.

The guidelines that Batfish wrote in the FAQ offer great help, as well as the experience of many other users.

I'm getting sick and tired of this 'look at me, look what i did' attitude. Act normal, please..

if you change the frame on a vehicle, i don't call it 'built a custom vehicle from scratch' it's just a conversion,

It was not a conversion. A gmaxx is a conversion. My revo is a conversion. You know I know better than this. When I say custom vehicle from scratch, thats what I mean.

Hippie, give us an update so we can see where we are at.

One thing i want to get straight; if a UBEC fails, it doesn't mean it will start glitching 100 percent sure. (and that's exactly what you say, which is plain rubbish/false information) and obviously, you feel too experienced to take anything from anyone else. And that's exactly my point.

you said it wont. I know for a fact it will 100%. I didnt say 100% of the time, but I know 100% that it does happen and that was a side effect on my application.

[glassdoctor]

You know what guys?

You are too busy arguing to see that you aren't really that far apart i swhat you are saying.

BP says it's overgearing that smokes a controller...

Serum says it's not gearing, but the current that kills.

Pretty much the same thing... except one is the cause and one is the effect.

Overgearing causes a massive amp increase... so you are both right.

And both wrong in being so absolute about it....

Which is what I tried to say a while ago :) :)

[rchippie]

Cant we all just get along :005: .


Okay here i go my first setup was as follows MM controller with 7XL with 14 3800 cells & a 13/46 gear or a ( 3.6) ratio with ubec. & fan. After about 5-6 min of running it would just stop. By the time i got of the drivers stand & got my car back to the pit table & temped the speedo it was 140 & was working again.

Set up #2 was same as above except for the ubec was replaced with a reciver pack. It did the same thing.

My MBX4 buggy that rene owns know used a 7XL on the same cells but had a 12/51 gear or a (4.25) ratio & a warrior 9920 had know issues what so ever.

After talking to leroy & jeremy on the phone i think it's over geared.

Jeremy orderd some century haredned pinions from tower for his crawler. He's going to let me borrow the 11t pinion so i can try it in my buggy to see if it is the gearing causing the issues im having. This pinion will give me a ( 4.1 ratio) which is a lot closer the ( 4.2 ratio) i had in my mbx 4 with the same motor.

[MetalMan]

That's strange... With that gearing you are looking at about 40mph or so, which I wouldn't think would be enough to cause the MM to thermal. Do you have a fan to try out? I was having the same problem with my MM in my Revo with a 7XL (5s2p A123), and a fan fixed it.

[rchippie]

Originally Posted by MetalMan

That's strange... With that gearing you are looking at about 40mph or so, which I wouldn't think would be enough to cause the MM to thermal. Do you have a fan to try out? I was having the same problem with my MM in my Revo with a 7XL (5s2p A123), and a fan fixed it.

Yes it has a fan, but you guys have to remember im carring almost 2 pounds of batteries :005: .

Rene that video is cool you gave that dog a good work out LOL. Is he or she a jack russel ?.

[coolhandcountry]

Keep us posted hippie.

[Serum]

Yeah Hippie, that's a Jack Russel.. these dogs are hyper-active.. In fact, it's one of the few dogs that isn't scared of the car..

[Serum]

One thing i can tell you about that 7XL, is if you use the KV values of wanderer (under load that is) speed will be higher;

I calculated the 7XL on the MBX4 with 14 cells; it should go about 60 or 62 km/h. But it did a 71 km/h. that's quite a difference, something i have yet to experience with another motor.

[rchippie]

Originally Posted by Serum

One thing i can tell you about that 7XL, is if you use the KV values of wanderer (under load that is) speed will be higher;

I calculated the 7XL on the MBX4 with 14 cells; it should go about 60 or 62 km/h. But it did a 71 km/h. that's quite a difference, something i have yet to experience with another motor.

So would that affect my gearing choice ?.

[coolhandcountry]

What happens if you put a 6xl in the calculator rene?
Does that match up better? Could you have a 6xl instead?