Noob Question for you tech guys.

[Rivermaxx]

Is there a way to run 2 smaller brushless motors with 1 mmm esc. Can you run them in parralel or series or something or would it not work and fry the ecm or batteries. The reason i ask is i just bought a used g-maxx chassis and a single speed converted tranny and I want to use both side of the motor plate instead of one off to the side. I have seen some of the vtwin setups but apparently its not the way too go.

[JERRY2KONE]

A lot of guys just do not like or recommend V-twin setups due to the added weight issues. The arguement is why put two motors on when you can purchase one motor that will give you the same or more power than a v-twin system. You can use the Novak Super Duty XR ESC to run two motors. There are a few other ESC's that will work, and I am sure that you will soon get a ton of responses for this both good and bad points. Good luck with that RIver. You may have read some of my responses as I am building a SuperMaxx right now with Twin Dewatl 18v 970 motors. It has been done before, but I wanted the experience with that setup anyway. I am using the super duty myself.

[Dagger Thrasher]

Nope, that's not going to work I'm afraid. In a nutshell, sensorless brushless ESCs use back-EMF pulses from the motor in order to know what position the rotor's in, so that they can drive the motor. Trying to run two motors on one ESC would result in two "sets" of back-EMF pulses, which would totally confuse the ESC and probably end up frying it. In theory it's possible if the motors were completely synchronised (identical KV and rotor start position), but simply getting hold of two motors with identical KV is nigh impossible.

In short, two motors on one ESC isn't going to happen I'm afraid. Twin VXL systems work, but they're an inefficient way of doing things; the two motors will always be fighting each other slightly because they're running on the same spur, and it's also a heavier solution. Plus, with two motors, you'll always get lower total efficiency than with one high-quality motor...and the VXL motors are already run hot. Lastly, it's more expensive.

Besides, two motors are completely unnecessary; one large motor can easily provide enough gumption. It might not look perfectly symmetrical, or as "cool" as two motors do, but you'll enjoy the lower cost, higher efficiency and greater simplicity of just one motor. Efficiency is *everything* in a brushless setup.

Edit: Just saw Jerry's post. RiverMaxx, the SuperDuty XR speedo that Jerry's talking about is a brushed-only controller. You can run twin brushed motors easily, but not brushless. I thought I'd try to avoid any confusion there.

[JERRY2KONE]

[QUOTE=Dagger Thrasher;254006]Nope, that's not going to work I'm afraid.

The Novak Super Duty XR is a brushed sensorless ESC

[Dagger Thrasher]

[QUOTE=JERRY2KONE;254007]

Originally Posted by Dagger Thrasher

Nope, that's not going to work I'm afraid.

The Novak Super Duty XR is a brushed sensorless ESC

Sorry Jerry, I was referring to RiverMaxx's first post. I must admit, I always thought that, for two brushless motors on a single ESC that the KVs had to be identical (e.g: if one motor was 2253KV exactly, then the other would have to be also), but obviously I'm wrong on that part. Still, it's tricky and a bit impractical to do.

Originally Posted by RIVERMAXX

I found some spec on that novak jerry. Maybe someone can interpret it for me. Will it even work with brushless what would be a good set of brushless motors too run? I am just exploring all my options this is not a for sure thing. How about 2 2200kv motors?lol
SPECS: Voltage input: 6 to 14 cells (7.2-16.8V) On-resistance:0.0011 ohms
BEC voltage: 6.0V/3A Weight: 4.03oz (114g)
Maximum current: (forward) 400A (reverse) 180A
Case size: 1.75" x 2.17" x 0.85" Rx wire length: 10.5"
Batt wire length: 7" (both) Motor wire: 13"
Wire Gauge: 14 Yellow (+), Blue (-)
Single motor limits @ 6 cells: None
Single motor limits @ 10 12 or 14 cells: None (550 size only)
Dual motor limits @ 6 cells: 10 turns
Dual motor limits @ 10 cells: None (550 size only)
Dual motor limits @ 12 and 14 cells: 12 turns (550 size only)

RiverMaxx, the Super Duty XR is a brushed-only ESC; totally different technology to brushless. It won't run any brushless motors I'm afraid. You're wanting something along the lines of a Mamba Monster, which is a big, powerful brushless ESC (but can also run brushed motors if you wish).

[JERRY2KONE]

Don't worry River you will get the hang of this all in good time. It is a little bit overwhelming at first, but some of it starts to sink in as you try different things on your own. Good thing is that there are quite a few very knowledgable guys on here that have already been through what you are feeling right now. Lean on them and they will lead you in the right direction. Trust in them and try the single brushless motor setup first. Then if you still want to explore the V-twin setup you will have learned enough to go that route with little trouble. I am glad to see that you are digging into this though.

By the way has anyone noticed the thread on (New parts). I posted up in there to let everyone know that UE is back in business. I know some of you know this, because I saw you on UE earlier. He is making up some monoblocks to start with to see how the response goes. He is being bonbarded with requests for other parts as well. We shall see.

[Rivermaxx]

With the toque these brusless engine make I didnt think weight was reallly an issue especially if you put the engines towards the front where its needed most because of the excessive wheelies.

[lincpimp]

You can run 2 bl motors off one bl esc. They have to run the same pinion size on the same spur, so in an emaxx it is doable. You do have to sync them to each other, I am a little fuzzy on the technique. The up shot is that it is simpler and often the same price to run one motor with one esc. A dual motor dual esc setup like the vtwin is an option. Most do not care for it, and a MMM combo with the 2200kv motor is a better choice.

[brushlessboy16]

Even if you were to run the motors on a common spur gear, the minute differences in gear mesh, kv values and other minute differences when the esc is switching 2 motors at hundreds of times a second... If you want to run 2 motors, your going to need 2 speed controllers... The Only problem is that you now have 2 systems transforming your battery power to heat (esc and motor), limiting runtime compared to that of a single system.... Best bet is to get a high efficiency motor (neu, CC, Medusa) and be done

[Rivermaxx]

I found some spec on that novak jerry. Maybe someone can interpret it for me. Will it even work with brushless what would be a good set of brushless motors too run? I am just exploring all my options this is not a for sure thing. How about 2 2200kv motors?lol
SPECS: Voltage input: 6 to 14 cells (7.2-16.8V) On-resistance:0.0011 ohms
BEC voltage: 6.0V/3A Weight: 4.03oz (114g)
Maximum current: (forward) 400A (reverse) 180A
Case size: 1.75" x 2.17" x 0.85" Rx wire length: 10.5"
Batt wire length: 7" (both) Motor wire: 13"
Wire Gauge: 14 Yellow (+), Blue (-)
Single motor limits @ 6 cells: None
Single motor limits @ 10 12 or 14 cells: None (550 size only)
Dual motor limits @ 6 cells: 10 turns
Dual motor limits @ 10 cells: None (550 size only)
Dual motor limits @ 12 and 14 cells: 12 turns (550 size only)

[Arct1k]

Not true - Linc is correct - You just need to sync the motors and esc.

I believe you mount the motors to the spur with pinions attached but not tightened. Then use a 1.5v battery accross two phases to align the motors - Only the shaft should rotate as pinion locked agains spur.

Then tighten the pinions down.

[BrianG]

IMO not worth the trouble unless you happen to have the motors laying around. Not only do you to do this on setup, but anytime a you change the spur and if a pinion grub screw comes loose - pretty much anytime the mesh changes at all.

Is it possible? Yes.

It is practical? Not really.

Better off getting a single motor setup that is the right size. Setup and wiring is much simpler.

[Rivermaxx]

So let me guess that novak i posted specs on wont work with a brushless setup. What brushless motor is equal to a 12 turn 550? Because I have know idea what those numbers mean. Sounds like I am going to go with the mmm combo and wait till the slipperential comes out so It can be symetrical. Thanks guys Btw will a g2 chassis work with a UE mono block?

[George16]

Originally Posted by Rivermaxx

Thanks guys Btw will a g2 chassis work with a UE mono block?

Only if you use the G1 rear end or cut the G2 rear end. I have a G1 rear end with mono. The driveshaft you'll need is 110mm. You can buy the titanium 110mm shafts from UE.

[Rivermaxx]

Yea I will pick it up sooner or later. Yea he must need money. He made a batch about 1 1/2 years ago and they sold out. I will believe it when i see it if he makes other parts.