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R/C Tech Forums Thread Wiki: Official Team Associated RC10 B5m Mid-Motor Thread
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Old 11-04-2014, 10:33 AM   #8926
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Rotating mass will be negligable IMO. This is simply going to change which direction the motor torques on both acceleration and braking.

4gear on-throttle = weight is transferred to the rear tires creating an on-power push

3gear on-throttle = weight is traferred to the front tires creating on-power steering (less forward traction)

The same opposite affect will be felt with braking. One will put more pressure on the rear tires under braking, and the other will put more pressure on the front tires. Although I haven't thought about it enough to know which does which.

My prediction is that if you run on a high-grip track where forward traction is in abundance, the MM3 will be THEE setup to run.



May be an interesting to try on my car. I jump between dirt and carpet over the winter.


Part #: 91606 MSRP: $15.99
FT Aluminum Top Shaft, B5M, 3 gear

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FT Front Motor Plate, black, 3 gear

Part #: 91604 MSRP: $3.99
B5M Gear Cover, 3 gear

Part #: 91607 MSRP: $6.99
B5M Gearbox, 3 gear

Total: $42.96
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Old 11-04-2014, 10:59 AM   #8927
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I think you all are going to hate mm3 on anything other than carpet. The b5m just doesn't have enough static weight over the rear to generate traction. You'll have to add a ton more weight to the rear than you'll save by going to the 3 gear to get it to work. I know, as I've had the option to run mm3 on my durango since I bought it three years ago. You guys are late to the party!

With that said, an mm3 car with enough weight over the rear drives like a dream
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Old 11-04-2014, 11:07 AM   #8928
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My MM has plenty of rear bite as is on a med-grip dirt track. The 3 gear will be interesting to see in action. I'm sure the stock guys will be testing is out soon enough.
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Old 11-04-2014, 11:40 AM   #8929
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My MM has plenty of rear bite as is on a med-grip dirt track. The 3 gear will be interesting to see in action. I'm sure the stock guys will be testing is out soon enough.
I should clarify that mm4 transfers weight to the rear of the car via the rotation of the motor. That weight transfer generates grip. Without that weight transfer, you have to add weight weight to compensate to maintain the same grip you had before.

I think stock guys will hate it the most.
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Old 11-04-2014, 11:49 AM   #8930
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I suppose it'll depend on the track conditions. I could see it working well around here, but we'll see.
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Old 11-04-2014, 12:22 PM   #8931
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I suppose it'll depend on the track conditions. I could see it working well around here, but we'll see.
the durango MM3 didnt make enough traction to get around the track on outdoor sugar. Maybe the b5 is different but i woudlnt even consider trying it unless i saw the top guys start running it first.
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Old 11-04-2014, 12:45 PM   #8932
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Anyone else find it odd that the RM3 and MM4 gearboxes use the same motor plate, gearcover and topshaft, but the MM3 needs special parts?
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Old 11-04-2014, 12:52 PM   #8933
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Anyone else find it odd that the RM3 and MM4 gearboxes use the same motor plate, gearcover and topshaft, but the MM3 needs special parts?
the motor plate is on the other side of the diff case with the MM3
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Old 11-04-2014, 01:07 PM   #8934
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the motor plate is on the other side of the diff case with the MM3
*Facepalm* Yep, that would explain the motor plate and gear cover. They are probably identical or nearly identical but mirrored. I still don't understand why the topshaft has a new part number. Are they lengthening it to help center the motor?
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Old 11-04-2014, 01:10 PM   #8935
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*Facepalm* Yep, that would explain the motor plate and gear cover. They are probably identical or nearly identical but mirrored. I still don't understand why the topshaft has a new part number. Are they lengthening it to help center the motor?
It's the aluminum topshaft and it uses the 5mm bearing vs. the standard 6mm. it's all stated in the write-up.
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Old 11-04-2014, 01:11 PM   #8936
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*Facepalm* Yep, that would explain the motor plate and gear cover. They are probably identical or nearly identical but mirrored. I still don't understand why the topshaft has a new part number. Are they lengthening it to help center the motor?
looks like they are going to a smaller bearing to further reduce the rotating mass.
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Old 11-04-2014, 02:08 PM   #8937
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Designers at MIP have to be pisssed they missed the launch of this....
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Old 11-04-2014, 02:32 PM   #8938
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the durango MM3 didnt make enough traction to get around the track on outdoor sugar. Maybe the b5 is different but i woudlnt even consider trying it unless i saw the top guys start running it first.
Mine works just fine on non sugar tracks but I also tune my own cars rather than copying someone else.
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Old 11-04-2014, 02:34 PM   #8939
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Mine works just fine on non sugar tracks but I also tune my own cars rather than copying someone else.
Well.. its not possible to copy a durango MM3 setup :P
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Old 11-04-2014, 02:53 PM   #8940
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looks like they are going to a smaller bearing to further reduce the rotating mass.
Yep, *now* I see that. Don't know how much I believe the "less rotating mass" or how much of an effect it'll have. It's just one more part you have to buy. The more interchangeable the parts are, the better.
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