I don't know about all of this. It was not long ago that everyone was praising the MM controller because they were capable of so much more than they were rated for.

As time has past and these controllers are being used more widely in applications for which they were never designed, I believe that we may just be discovering the limitations of the MM controller.

I've exchanged emails and have had conversations with the guys at Castle. I've asked many questions and have gotten answers ranging from "the MM was never designed for that application" to "it must be something else because it couldn't be our controller." On my last contact with them, I was told that my cogging problems were due to my battery not being able to supply the needed current to the esc. He told me that before he asked me what batteries I was running. I happened to be running a Kokam 4S 4.8Ah pack, and I think that I'm pretty safe in saying that the battery wasn't the problem. I've also heard the connector bit too. I was direct soldering for a short time too. This did help with the cogging, or it seemed that it did anyway (I was using 4mm connectors). Since then, I've gotten some of the 6mm connectors from Neu. When measuring the resistance across a piece of wire and then comparing that to a piece of wire with a 6mm connector in it, I got no measurable increase in resistance. I've gone and re-wired all of my setups with the 6mm connectors and haven't seen or noticed an increase in cogging.

Things that I have seen that I know will cause problematic cogging is running the MM in a heavy vehicle or a vehicle with large diameter tires. I have a Muggy that I converted and the Muggy seems to be heavier than other truggies by a pound or two. It is a beast of a truck if you compare it to a real truggy, like an 8ight. When I first got the muggy I put a 7XL into it and with the 40 series tires, I had to run a 9T pinion just to be able to get it to go at all. I'm now running it with an 8XL and a 10T pinion with 40 series mashers, which are very big tires and it's doing ok, but I really can't gear for any speed. If I go up to a 12T pinion, I start getting the cogging problem again.

On the other side of the spectrum, a friend of mine had a MM 5700 system in his 1/10th scale dragster a few weeks ago. He was running with a matched pack of GP3700 cells (I think they were 3700s) and when the light turned green, his car lept backwards. This only happened once that day, but it did happen. He subsequently called Castle and told them what he was doing and they said that they would send him a new controller without any other questions. I wonder if there is something particular that is causing this that castle is aware of.

If you are having a cogging issue, try dropping your pinion by two teeth and see if it gets better. If it does get better, perhaps your setup has the esc on the ragged edge of what it can comfortably handle. I don't know, it's just a suggestion. I know that after all of the issues that I've had with my MM controllers and the lack of support for them (with the understanding that we are running them out of spec), all five of mine are going to be retired at some time in the near future, in favor of something that can comfortably handle the 1/8 scale conversions.

I know that the Compro that I got recently wasn't what I expected. I believe that I got a defective unit, but I can say this. On 4S or 5S lipo with either a 7XL or an 8XL motor, no matter what gearing I used, it never cogged or ran hot.