MM Pro enough for a savage?

[scarletboa]

after FINALLY being offered a refund for my defective EZrun 150a speed control, i am considering getting a new MM Pro. i will be running a 1400kv KB45 motor on 6s geared for ~40mph. will this esc have enough guts to push the truck nicely? i've seen people use the original MM escs to push savages on 4s without issues, and the MM Pro has better FETs and obviously, a fan and higher voltage rating. i don't see any problem with the setup i want to use, but i would feel better with some kind of confirmation.

edit: my savage is a converted x 4.6 and besides the whole BL setup, it is stock and i will be using stock tires and old t-maxx tires. it's not like i will be pushing an integy truck with moabs.

[brushlessboy16]

Seems like it should, but no one has run the esc.

On paper it could work

[Snipin_Willy]

Why not go with the MMM? It is made for 1/8's after all.
If it's the reliability your after just remember how many times the MM and MMM have been revised since their original release.

[scarletboa]

Originally Posted by Snipin_Willy

Why not go with the MMM? It is made for 1/8's after all.
If it's the reliability your after just remember how many times the MM and MMM have been revised since their original release.

the MM pro is cheaper and i am only getting $100 back for the EZrun return. i also plan on running it in my rustler and possibly a hyper mini ste some day. i know the MMM doesn't fit under the ste body, but the MM pro should.

also, does anyone know what the warranty will be on the MM pro? will it be like the v1 and v2 MMM where you can just send it in anytime for upgrade?

[Thomas]

I just got out of my time machine and can tell you MMP v2 came out in January 2010 and every v1 got replaced for free.

Oh wait, the MMP isn't available yet

[Happywing]

I would use the old MM. The MMP has less FET's... Someone more knowledgeable than me told me that it might be a 50-65amp controller at most. It is made for 1/10 scale.

[J57ltr]

Originally Posted by Happywing

I would use the old MM. The MMP has less FET's... Someone more knowledgeable than me told me that it might be a 50-65amp controller at most. It is made for 1/10 scale.

Care to elaborate? Don’t name names if you don’t want, but what did you hear? As I recall reading there are about 18 FETs form ON semi form what I remember, and they were lower on resistance (less voltage drop and heat), and are just released. That may only give you 3 fets per phase conducting at a time, but they are better fets. I remember the days when IRF was dropping the Rds on their fets in half almost every year. And that was back when the best Rds you could get was 28 milliohms.

Jeff

[TexasSP]

So the fact the the new FET's are better doesn't even matter? Who knew?

FET count is not everything.

I would think conservatively geared it will be fine. Besides, the MM cannot be run on 6s. Some survived on 5 with mods.

[nitrostarter]

I would honestly opt for the MMM to be on the safe side.

[BrianG]

I too would go with the MMM for the Savage. The MMPro might be able to handle it, but I think it would be stressed doing so.

[Bondonutz]

M.M.M. save some more $$. You'll be better of in the long run.

[Pdelcast]

Originally Posted by Bondonutz

M.M.M. save some more $$. You'll be better of in the long run.

Agreed -- The MM Pro handles 1/10th and 1/8th buggies, but isn't intended for monster trucks. The MMM is a much better choice.

The MM Pro has 18 x 1.2 milliohm FETs (.0004 ohms), and the MMM has 36 x 1.8 milliohm FETs (.0003 ohms.)

So the MMM has lower resistance, a larger fan, a larger heat sink, and a larger circuit board (for heat spreading.) The MMM will handle the current level on your Savage better than the MM Pro.

In our testing, the MM Pro handles about 2/3 the current of the MMM.

Thanx!

Patrick

[BrianG]

So, since the MMM is rated for ~120A (according to the castle special projects page), that would mean the MMPro is good for ~80A? So, about the same current rating as the regular MM, but with higher voltage (and therefore power), and a switching BEC.

Speaking of the Special Projects page, someone needs to update the voltage rating of the MMPro; it says 12v.

[Pdelcast]

Originally Posted by BrianG

So, since the MMM is rated for ~120A (according to the castle special projects page), that would mean the MMPro is good for ~80A? So, about the same current rating as the regular MM, but with higher voltage (and therefore power), and a switching BEC.

Speaking of the Special Projects page, someone needs to update the voltage rating of the MMPro; it says 12v.

Remember, those are continuous duty specs -- in most applications the MMM will handle significantly higher than 120A.

[BrianG]

Of course. Just trying to get a feel. Even though we never run continuous current to those levels, everything else in the world is rated continuous, so it just makes things consistent for comparison purposes.