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  1. #1
    RC Competitor
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    Question Gearing for a Mamba X 2400kv?

    With the project I'm working on, I'm building an anza chassis slash with a mid-motor mod, and plan to get the Mamba X 2400kv setup soon. I was wondering, what gearing would be best? It will be 4S with a 54t spur, and I want to buy two pinions, one for normal street driving/sliding and one for high speed runs (not going for any records, just something to hit at least 80 when I want it to).

    Suggestions? I'll be picking from the Robinson racing lineup:
    http://www.robinsonracing.com/catalo...nion.html#86xx

  2. #2
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    The biggest you can fit. I think 28t with 32p was what i used. It gave the car less
    Torque. I gave up with the 2400 too much breaks, and i had a very loose slipper.
    The diff gears always broke even with the max punch control. Get a smaller motor.
    I run a a 2680 kv on my car on 4s it has just enough torque. or try a 2 pole motor

  3. #3
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    Dont even try metal drive shafts its too much weight on the brittle diff sun gears. Use the 4x4 ones and put a 8/32 bolt in the shaft hole and cut it off. This strebghens them a bit without lots of weight

  4. #4
    RC Turnbuckle Jr. jvogel's Avatar
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    I have this exact system in my Sla2h that I run on my technical off-road track. I use these 32 pitch gears: 15/58. The only way to know what is right for you is by taking temperature measurements. I can send you, via PM, more info if you need it.
    Obstacle Magnet

  5. #5
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    I can see that the diff gears are the weakpoint on this vehicle class, but I find it hard to think that a 2650kv motor would be better at saving parts than responsible driving. Also the larger can size of the 2650kv means that I would have to cannibalize my transmission case and possibly have to raise the entire rear assembly just for it to fit, which seems like a no go. I will most likely get 3s and 4s packs to test strength/drivability between the two, and I'll definitely be picking up the largest 32p pinion I can find.

  6. #6
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    It MIGHT just barely fit without raising anything, but I would still have to dremel the case and possibly shave a millimeter deep rut on the chassis

  7. #7
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    Not a castle motor a smaller one with a 3660 can size not the large castle 2650kv, something like a g force 2700

  8. #8
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    I have been heat treating my diff gears too harden them. It's helped a bit. Torch them until red and put them in oil 2xs. Bad horse diff lube has also helped slow down the gears a bit. Just be careful or you ll break them fast. I did love the 2400 motor though.

  9. #9
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    Interesting approach. If I break them I’ll look into that. I will be using heavy silicon oil.

  10. #10
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    By that I mean in the diff, not cooling. Is there accurate data for cooling periods with hardening these gears or do you just do trial and error?

  11. #11
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    Heat until red then put in oil , repeat check hardness with file , done

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