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  1. #1
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    EREvo with MM 2650 System !

    EREvo with MM 2650 System !
    will it work good
    as a matter of fact i m stuck with it ask my brother to order a 2200kv system and he ordered 2650 !
    what will be the best gearing for it !

  2. #2
    RC Turnbuckle Jr. vxlrocket's Avatar
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    Quote Originally Posted by reddy View Post
    EREvo with MM 2650 System !
    will it work good
    as a matter of fact i m stuck with it ask my brother to order a 2200kv system and he ordered 2650 !
    what will be the best gearing for it !
    yes, it'll work great in it. i run the 2650 in my revo and i love it. I run 54/22 (sometimes 24) for gearing on 4S and it's as fast as a 2200 on 5S. no worries at all, it's a great system for the revo. i actually prefer it over the 2200 for this truck.
    ERBE, 8ight, 8ight-t, b4,b44, scte, slash 4x4

  3. #3
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    HEHEHEH !!! thanks ! my worries r over !
    but mine is with Proline 40 series 3.8 tires
    Last edited by reddy; 10-24-2012 at 01:23 PM.

  4. #4
    RC Turnbuckle Jr. vxlrocket's Avatar
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    Quote Originally Posted by reddy View Post
    HEHEHEH !!! thanks ! my worries r over !
    but mine is with Proline 40 series 3.8 tires

    me too. i run the 40 series badlands
    ERBE, 8ight, 8ight-t, b4,b44, scte, slash 4x4

  5. #5
    RC Turnbuckle Jr. 87 GN's Avatar
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    lower the kv the more torque....

    On 2/2S lipo with the 2650kv motor:

    18/68 = 35mph
    18/62 = 38mph
    18/58 = 41mph
    18/54 = 44mph
    20/54 = 49mph
    Would you go flip my truck back over??

  6. #6
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    i think i will go for 20/54

  7. #7
    RC Turnbuckle Jr. vxlrocket's Avatar
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    with my old e-maxx tires (5.75's) and a 24t pinion, the speed calculator says i'm doing 64mph. with the 22T, 59mph.

    here's the variables:

    Enter Front/Rear Differential Gear Ratio:
    Traxxas E-Revo - 2.85:1

    * Enter Transmission Gear Ratio:
    Traxxas E-Revo - 1.83:1

    †† Enter Additional Gear Ratio :1

    * Enter Spur Gear tooth count :
    Traxxas E-Revo/3905 E-Maxx - 54T

    * Enter Pinion Gear tooth count:24T

    * Enter total battery voltage :
    4.2v Lipo max
    4 cells
    * Enter kv rating of brushless motor :
    Castle Creations 1512/1y 2650kv - 2650kv

    * Enter tire diameter in inches :
    Traxxas Maxx (old) - 5.75"

    Spur/Pinion Reduction Ratio :2.25 : 1

    Total Reduction Ratio :11.74038 : 1

    Tire Circumference :18.06 inches (458.83 mm)

    Rollout :1.54:1

    Total Motor Speed :44520 RPM

    Theoretical Maximum Vehicle Speed :64.87 mph (104.2 km/h)
    http://scriptasylum.com/rc_speed/top_speed.html
    ERBE, 8ight, 8ight-t, b4,b44, scte, slash 4x4

  8. #8
    RC Turnbuckle Jr. 87 GN's Avatar
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    * Enter total battery voltage :
    4.2v Lipo max 4 cells


    I figure the Volts at 3.7v nom = about 5 mph difference


    20/54 2/2s 48.86 mph 3.7v
    20/54 2/2s 55..47 mph 4.2v

    copy paste in link above ~ import
    change cell count & gearing

    Differential Ratio: 2.8461538461538463
    Transmission Ratio: 1.8333333333333333
    Other Ratio: 1
    Spur Tooth Count: 54
    Pinion Tooth Count: 21
    Total Voltage: 22.20
    Motor KV: 2200
    Tire Diameter (inches): 5.9
    Tire Ballooning (inches): 0
    Motor Current Draw: 0
    Motor Coil Resistance: 0.006
    Spur/Pinion Ratio: 3 : 1
    Total Ratio: 15.65385 : 1
    Tire Circumference (inches): 18.54 inches (470.8 mm)
    Rollout: 1.18:1
    Total Motor Speed: 48840 RPM
    Vehicle Speed: 54.76 mph (87.97 km/h)
    Effective KV Value: 2200
    KT constant: 0.61 oz-in/A
    Last edited by 87 GN; 10-27-2012 at 02:30 AM.
    Would you go flip my truck back over??

  9. #9
    RC Turnbuckle Jr. vxlrocket's Avatar
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    I'm wondering why you chose 3.7? My lvc i set at 3.6. Now i understand your variables as to how you calculated your speed. Perhaps a mid range voltage would also be a good representation since we were calculating both ends of the spectrum of possibility.
    Last edited by vxlrocket; 10-28-2012 at 03:18 AM.
    ERBE, 8ight, 8ight-t, b4,b44, scte, slash 4x4

  10. #10
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    my MM system came with M 0.8 pinion can i use this with erevo ?

  11. #11
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    Quote Originally Posted by reddy View Post
    my MM system came with M 0.8 pinion can i use this with erevo ?
    mod.8 and 32 pitch are the same so, yes you can use that pinion.
    | Rally GT8 Powered By CC |

  12. #12
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    Technically speaking under load lithium batteries provide approximately 3.7V (nominal voltage).

    Realistically using 3.7V as a battery voltage for those calculators is far more accurate than full charged voltage as there is serious sag under the loads the power system draws.

  13. #13
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    Quote Originally Posted by humayrayakongkinaon View Post
    mod.8 and 32 pitch are the same so, yes you can use that pinion.
    18t pinion came with system have to buy a new 1

  14. #14
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    at last it arrives time to go monster mad !

  15. #15
    RC Turnbuckle Jr. humayrayakongkinaon's Avatar
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    picture not working, let me know how this motor perform i might consider getting this for my build.
    | Rally GT8 Powered By CC |

  16. #16
    RC Turnbuckle Jr. 87 GN's Avatar
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    Quote Originally Posted by vxlrocket View Post
    I'm wondering why you chose 3.7? My lvc i set at 3.6. Now i understand your variables as to how you calculated your speed. Perhaps a mid range voltage would also be a good representation since we were calculating both ends of the spectrum of possibility.
    3.7 v per cell so on so on.. Don't really have a good answer that is the preset voltage. I agree that is a bit low, but at the same time 4.20 is not a true voltage either, voltage drop. A happy medium say 4.10 or 4.0v maybe...?? What do you think. Might have to start posting the V, when posting gearing speed....
    Would you go flip my truck back over??

  17. #17
    RC Turnbuckle Jr.
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    on my merv and neu 1110 1/y i was seeing drops below 3.4 and with the 9000kv motor to 3.2v
    when i do some testing with the erbe with my eagle tree v4 /gps i will post some numbers running stock motor stock gearing and spc 5000 50c batteries

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