MBX-5 going BL. Center diff question.
 

Hello all,
I've been using this site for research for well over a year now and just now registered(bout time eh?). I will be following up with a full report after my initial question in the coming weeks. I'm converting a Mugen MBX-5 to BL LiPo. I know I need to swap out the Mugen diff for a plastic spur compatible diff. I would like to use the stock center CVD's. What would work as far as drive cup dimensions and length, or are they all the same?
Preliminary plans are MM controller, 5S MaxAmps 10Ah and NEU 1515/2.5D but more on that later. Thanks, Stephen.

welcome... jeeze it's about time, lol.

I'm not sure exactly what the differences are in a Mugen. I would think there is a way to use the stock diff, CVDs etc. You may have to change out the one bearing that fits on the center gear, if you use a Kyosho plastic one, but that should be it.

Maybe I'm missing something?

That will have some killer runtime.... +30 minutes easy.

Should be wicked fast too... 5s and that 1515.... :004:

i believe the holes in the moogen diff cups are located different then the ones in the mp7.5/777 cups.

Use a hot bodies buggy/truggy diff(which accepts the kyosho plastic spur) and the Hot Bodies center bulks(same hole pattern as the Mugen). This combo will drop right in. Drop me an email if You would like me to provide these parts for you. :)
rcmonstermike@gmail.com is the quickest way to get me through email. :)

And welcome to the forums. :)

Yeah, you must likely need the diffs internals as well, since the HB uses 4 mm cross pins. (i thought the Mugen used 3mm X-pins?) anyway; the HB uses 4mm pins, and 6mm outdrive cups.

yes - the whole HB diff is needed to make it work. :) Mugen diffs are smaller overall (shorter end to end, as well as smaller shafts, etc.). Fortunately, they use offset center bulks, so the HB bulks allow a direct drop in of the HB diff. :)

Can the MM handle 5s for the long hall. I heard of a few people using 5s but, will it hold up over the long run?

We'll see if my E-lst will outrun your buggy. Ha ha. :)

If you are planning on running 5s as your every day setup IMO you would probably be better off with something designed for that voltage. The MM will run it, but thats pushing it. There are a few on this forum that run the MM on 5s regularly, but for relaibility you should go for something rated for higher voltage.

The MM and the Neu isnt necessarily the best combo either. The MM can have some cogging problems with the Neu motors. CC is working on a software update for the MM to fix this, but no ETA on that yet. IMO the MM is best paired with a standard 2 pole motor until they get that ironed out.

Thanks to Mike and everyone else. I'll get the HB stuff on it's way. Now to the fun stuff. First off I should point out this will be a race buggy for racing with the "nitro guys". I really want to run the Neu motor because of their efficiency and US made. I also think the MM is the cats meow. Ya I've also been waiting for the MMM but want to be rolling by late march or so of THIS year LOL. Well I guess I will stick with the Neu. So is the Quark monster pro 125B(heat sinked) and the Neu 1515/2.5D the ticket or is there a better setup for the money? I want to be able to run a 20 min. main so I figure the 5S 10Ah will be more than enough. I take 4200Mah on 4S in a 10 Min race with my 10.5 lb G2R with the HV6.5 and I'm sure it's not near as efficient.

If you definitely want to run 5s, then an ESC like the Quark125B or one of the BK Warrior ESCs might be a better choice (need an LVC for the Warriors though). Like was said, the MM will run 5s, but you're pushing it. The Quark has an easy to mount case, has a lot of programming options, built-in LVC, etc. There are some people (me included) who have issues with cooling, but an extra heatsink is easy to add. And it runs the Neu perfectly fine. Downside is the price.

If you're running 4s, the MM would be the best bet, providing Castle comes out with the software fix when using Neu motors.

I'm sure I don't need 5s for racing. I just figured the higher voltage would be more efficient and run cooler. What's the word on the update for the MM 4 pole compatible? If they come out with it soon I would consider running 4S with it. MM is great let alone Castles customer service.

The only thing I've heard about the MM update is "soon". Then again, the MMM was supposed to be released "soon" as well, and we know how that's going...

it will be worth it tho, id rather have it be right from the first one sold over tere wrong and need updates and all that

i do hope tho the mmm is here soon, and the mm with 4 pole will be sooo cool