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Thread: Gear question

  1. #1
    RC Racer
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    Gear question

    So I have stock revo motor and esc wise and I have the stock gearing, I did change the 65t spur to the supply 54t but I was wondering if I can change the pinion gear up a tooth or two to get little more top speed with out having to go to 6s due to have stock diffs
    Slash 4x4 & E-revo brushless

  2. #2
    RC Qualifier
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    Yes you can, I run 20, 21or 22 tooth pinion on 4s with the 54 tooth spur! 21/54 seems to be a very popular gearing setup just check the motor and ESC temps while running really hard off road.
    Last edited by JJ1224; 08-11-2014 at 08:43 PM.
    Erbe, Merv Vxl, Rusty Vxl.

  3. #3
    RC Turnbuckle Jr. 87 GN's Avatar
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    I run Badlands 21/54 on 4s, high 40 mph. nothing wrong with gearing up, if your batts can supply the amps and these are the temps to watch for



    A temp gun is kind of a must have.....
    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..

    Motor ~ 180/190*F (82/88*C) maximum, ideally 140/160*F (60/71*C), temps can be 10*F higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F (65*C)
    The MXL-6S / MM2 fan runs non-stop, also should be taken off when driving in wet conditions.
    Lipo's ~ 140*F (60*C) max, ideally 100/120*F (38/49*C).........
    Would you go flip my truck back over??

  4. #4
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    these should be useful to you for gearing questions. good luck

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    Erbe, Merv Vxl, Rusty Vxl.

  5. #5
    RC Racer
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    Quote Originally Posted by 87 GN View Post
    I run Badlands 21/54 on 4s, high 40 mph. nothing wrong with gearing up, if your batts can supply the amps and these are the temps to watch for



    A temp gun is kind of a must have.....
    Hot motor + cool esc = under geared.
    Cool motor + hot esc = over geared
    Everything warm just right..
    I
    Motor ~ 180/190*F (82/88*C) maximum, ideally 140/160*F (60/71*C), temps can be 10*F higher inside the motor
    ESC ~ pretty much same temps / Fan comes on @ 150*F (65*C)
    The MXL-6S / MM2 fan runs non-stop, also should be taken off when driving in wet conditions.
    Lipo's ~ 140*F (60*C) max, ideally 100/120*F (38/49*C).........
    So I order a 21t not thinking different shaft size so one I ordered didn't fit what part number is a 21t pinion that fit the 2200kv mamba monster shaft
    Slash 4x4 & E-revo brushless

  6. #6
    RC Turnbuckle Jr. 87 GN's Avatar
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    Mar 2010
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    kansas
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    8,683
    you need


    Part Number: RRP8721 (last two numbers are the tooth count)
    Manufacturer: Robinson Racing
    Hardened .8 mod 21T Pinion Gear with 5mm Bore (32 pitch)
    Would you go flip my truck back over??

  7. #7
    RC Qualifier
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    Victoria, Australia
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    i have a variety of Hot racing pinions they have worked great for me

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