How about tearing out the red wire of the receiver's connector and use an external bec, instead?

That might help.

I really do not depend on the bec of the brushless controllers that much.

I did pull the red wire when I used the ubec on the Mtroniks. Wierd but it didnt like it.

Like I said before, try loading the internal BEC with a resistor. It might simply not like having too little of a load. Usually, using a minimum load is a switching supply issue, but who knows what MGM uses for their BEC...

I would try programming my Compro using the internal bec, but after the experiences that others have had, I'm afraid too. As it is, I'm contemplating having to get another ESC, but if I had to get a new Spektrum receiver and JR Z9000T servo too, I think I'd hang it up for a while.

So, does that mean your MGM is not good?

I've paid a damn $450 for my MGM and I'm afraid it will fail me as much as yours did.

I'm not saying that my MGM is not good. I'm just saying that I'm having trouble programming it. I'm also afraid the use the internal bec, because some have had problems with the bec blowing a frying receivers and servos. Since I have an external bec, I have to need to even risk using the internal bec.

AAngel, from what i've gathered through research, the higher total system voltage, the harder the hit on the internal BEC. I think thats where mine went wrong. I was right at the threshold voltage of abusing the BEC. Luckily my ESC is ok and my expensive radio equipment is ok. Unfortunatly my $100 servo is toast along with a stock traxxas servo. I'm also a little annoyed that along with buying the replacement servo's, i'm going to have to sink another $40 into a UBEC.

$280 - Neu 1515 1y
$235 - MGM 16016
$185 - 2 x 6000mah 2s2p lipo
Burning up on board electronics because of cheap internal BEC components - Priceless (or in this case, $100 for UBEC and new servo's)

Well,

Get this, the 5S2P 8Ah pack that I ordered from truerc on Saturday, showed up this morning. That guys doesn't mess around. Anyway, running on 5S, I have to use the external bec.

I'm still messing with it. That clacking sound that I was hearing was my front diff. The case cracked. I replaced the case and it cracked again. I'm hoping that there was a high spot on one of my gears causing the cracking. If not, then either the compro system is too powerful or too abrupt, since I never had this problem running my MM on 4S with the same motor.

When the bec fried in my Mtroniks... all I got was a roman candle under the body, lol.... a little flame and a lot of smoke. At least it didn't take anything else with it...

GD, it sounds like you lucked out. With my luck, the esc would have flamed the lipo and then there would have been some real fireworks.

That's true - you DO seem to have poor luck! You need to go outside and find a couple 4 leaf clovers or something! :)

Well, I think I'm in for a change of luck. I'm due one anyway. What do you guys think of my charging my 5S lipo pack to 95% capacity (my charger will do that) and putting it on one of my Mamba Max controllers with the 8XL?

Does anyone know what the actual maximum voltage is for the MM?

BTW, Mike emailed me today. He seems to be a helluva guy. I'm going to give him a call. Although I'd feel like an idiot, I'm hoping that I'm doing something wrong with the Compro.

I dont know of an actual voltage limit, I do know that my MM does not like the 5s when it comes off the charger. I usually just end up holding the car in the air and giving it full throttle for like 30 seconds to bring down the voltage. after that everything seems to work fine.

gixxer,

What do you mean that it doesn't like it? How does it behave?

I also spent some time on the phone with Mike today. He walked me through the programming procedure and still no dice. I'm pretty sure that it's the controller and not me. It looks like I'm going to be waiting for my Compro to make an overseas trip, unless Mike proposes something else.

That sounds a lot like I've heard the Quark operates at 6s...

the esc just cuts out and I have to turn it off and back on again. once the voltage drops a little the esc acts normal. I know someone else said they were using 5s and theres didn't do this. So I think its just right at the edge of what the esc can handle. I was actually going to go back to 4s because of this but have desided to just deal with it until the new esc's come out(mmm or the tekin).

I would try the battery on the MM since you already own one. if yours acts like mine then just set your charger to cut off early.

Well, the 5S on the MM with the 8XL and 9/46 gearing with the stock 40 series tires works. I've only been able to run it around my sun room, but it cogs very rarely and then not badly at all. I wish I had know, I wouldn't have gotten the Compro. I could have held out for the MMM.

I guess, where the MM on 4S with the 7XL was giving me trouble, the 5S with the 8XL has a lower amp draw and it working.

I'm just waiting to see what Mike proposes that I do with this Compro. If I have to wait for it to get back from the Czech Rep, I might just sell it cheap when I get it back.

good to see that you finally found something that works for you.

So i figured i'd post in this thread since it was already going.....

I installed my new servo's last night and strapped everything down. came home from work today and put it to the test.

it doesn't seem to like full throttle. i can gradually increase the speed all the way up to about 80% throttle, but when i go that last little bit, it starts to randomly pulse the throttle and sometimes just goes neutral and won't accelorate until you return the throttle stick to neutral and try again.

I've reprogrammed it a couple of times and it doesn't seem to help. I have the timing advance set to automatic.

when it does go, its got a superb amount of power, it just won't let you stay on the throttle.

Anybody have any suggestions?

When you say "reprogrammed" do you mean you recalibrated the controller to your transmitter? I was thinking that the ESC was taught that 100% throttle was actually 80% trigger throw and now when you go to 100% on the trigger, the ESC doesn't know how to handle 120%...

I can adjust endpoints (MX3 radio setup). This radio combo is the only one i've programmed/used with the ESC. I tried backing the EPA on the transmitter to 90%, the difference was almost none

Does anything need to be changed when using a 4 pole motor? I had that BEC problem with it but i don't think it would have effected the controller (seperate circuit), besides, the BEC still works.

Also, the MGM manual states that automatic timing should not be used with high inductance motors (5 or 10 deg should be used). Is the Neu 1515 1y considered high or low inductance?

Don't know if there are special settings for certain pole motors. I also don't know exactly what the inductance rating for Neus are, but I would say they ARE high inductance since their operating resistance is normal, yet they have very few winds when compared to similar kv motors. Which means most of the "resistance" comes from inductive reactance rather than pure resistive resistance (if that makes any sense).

captain, did you get your Compro in? If so, how is it working?

I really wish that I had just gotten the Quark. I've sent mine off to Mike and now there's no telling how long it will be before I actually get to run something that will accommodate a four poler.

At this point, I've almost lost interest in being able to go with the Neu. Actually, I've almost lost interest in this whole thing. I'm just going to bide my time until I get the Compro replaced with something. If I have more problems, I may just dump the whole thing and move to helicopters. LOL. It's what one of my friends did, and he's been bugging me to get something to fly.

Hey man

What's your full setup? Have you considered a Kontronik Jazz? I've just started testing a 40-6-18 in an RC10 and it is working pretty darn well. I was planning to use a 55-10-32 and Neu 1900 in my 1:8 conversion with some hesitation, but now I'm really amped to try it.

I'm into helis too, and they are my fall back option if the Jazz doesn't work in the car. It is one of the best heli controllers out there, so for me the money won't be wasted if it doesn't work out in a car. They're also a heck lot cheaper than the MGMs!

I know how you feel with the ESC and Neu motor situation. The only reputable car controllers are either limited to 5S lipo or 2 pole motors. People wanting to run 4 or more poles and HV have to experiment. :(

Aragon,

I remember checking into them, but didn't give it much thought. I didn't think that they would work well in a truck. What about brakes and reverse.

Edit- I just went and checked them out. The highest current rating is for like 55A continuous. I don't think that it will even come close to meeting the demands of an XL class motor in an 1/8th scale truck. For my comfort, I'd prefer something that can live with over 100A constant.

Depends what your truck needs. At 55A and 37V, that's 2000 Watts continuous, which is a helluva lot. That controller has been seen to achieve split second bursts of over 3000 Watts in large heli setups...

Proportional braking is working great for me. If anything it's too strong for my car! Reverse... I would not program that in. The Jazz makes no attempt to brake the motor before putting it into reverse. :)

Just noticed you had the 16016 MGM, so I guess your truck components are already all setup for 5S? The Jazz 55-10-32 will definately be too small on 5S. Maybe an 80-6-18? Or a Quark?

Mike had me send mine directly to MGM last time. Wonder why the difference?

Anyways, I got mine back repaired after just five months. I hope yours goes smoother.