Mamba Max Cogging

[Rcaddict]

I'm runnning a Mamba Max with 4s lipo, UBEC and a Neu 1512 in an MBX 5. Every now and then the motor will cog so bad that I cannot get going without pushing the car. Are there any settings on the ESC that are better to reduce the cogging? I set the start power to high and that seems to help.

[BrianG]

There's a thread on the Castle forum for this type of thing under "Mamba Max Quirk". So far, no one has been able to find a definite solution. Your situation sounds a little worst than other though. Have you also messed with the motor timing?

[Rcaddict]

I'll try experimenting with the timing. It's not real bad, maybe 1 time out of 10 from a standstill I'll get the cogging. I can usually get going by easing into the throttle, but sometimes the car just sits there stuttering.

[BrianG]

From what I've seen/heard, your brand of cogging seems to be when the MM ESC is used with a Neu motor in a heavier vehicle, like a buggy. People, such as myself, running the MM in a Stadium Truck or similar vehicle, only seem to have the quirk I pointed out (where it cogs from reverse to forward).

What you describe sounds a lot like what glassdoctor has noticed. I wonder if the MM has a hard time with 4 pole motors?

What someone needs to do is make some kind of spreadsheet listing each setup for all those with MM problems. Once enough data is collected, maybe a common demoninator will be evident.

I wonder if the information in this thread should be merged with the "Quirk" thread so all the info will be in the same place? I guess that's a decision a mod has to make.

[glassdoctor]

I have seen this, yes. I haven't found a setting that cures it either. And I got conflicting suggestions from Castle depending who I talked to.

One thing I can say for sure is that if it coggs bad like that so that the car just sits there..... DO NOT stay on the throttle. If it happens, let off throttle immediately and try to give it just a little throttle like you said, ease into it.

If you mash the throttle when it's just sitting there stuttering it will get VERY hot VERY quick. The thing is though that sometimes that's what makes the car go... I have seen many times when I give a full throttle take-off and it cogs just for a second and then takes off. But sometimes it won't go and the longer you stay on throttle the more it will heat up, if the car doesn't GO....

This hasn't really been an issue for me when racing because it's rare to have the car stopped. Only when getting marshalled, etc... so the odds are it won't be cogging during a race. But still it's a possibility and I have had it happen a couple times while racing.

[Rcaddict]

That's good to know. I did have it happen in a qualifier and it cost me 2 positions, but I was stabbing the throttle which was probably aggrivating the situation. There have only been two occasions where the car just wouldn't go.

How do start when you run a main? Do you start from a standstill or do you have someone hold the car up in the air while you spool it up like a nitro. I did the spool up method and it worked pretty well. I was in the first position and could not risk having a hesitation and causing a big pile up.

[Serum]

I am using the MM with a 6 pole motor, it goes okay, Brian

[zeropointbug]

What 6-pole motor, that interests me so.

[Serum]

An inrunner.

[glassdoctor]

I just start with the car sitting there... it normally doesn't cog and I just hope that it won't happen at such a bad time.

I guess eventually it will happen at the start of a main.

But you only do that once per race day and odds are it would only happen maybe once in a season of racing??

Right now it's the off season for me... maybe next summer I'll get to do a lot more racing with it and get a better handle on the issues. I'm hoping there will be a MMM by that time but who knows?

[Dafni]

Yeah, Glass, the money is on the MMM. But we can hope for a software-update for the MM too.

[Serum]

Daf, speaking of which;

how is the rc10t2 doing? you must get serious runtime from it with that 12Ah pack?

[BrianG]

Originally Posted by Serum

I am using the MM with a 6 pole motor, it goes okay, Brian

Well, there goes that theory...

[Serum]

But perhaps it's the rough startup of the neu's which makes it worse. My 6 poler isn't that hard to turn than the 4 pole Neu..

[BrianG]

I guess that's why we need some sort of spreadsheet to document everyone's setup and the problem they are having. It still seems the MM has more issues with the Neu motors than others...