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  1. #1
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    Gearing down my 8s X-Maxx

    While working on winch powered snowplow project Ben1272 asked about my gearing...
    I knew nothing about lowering or raising gearing so I went to the school of Google and did some research.
    I am now running on stock metal 54t spur gear and lowered the pinion gear from 18 to 16t .
    Huge difference! On take off, it isn't reaching for the sky anymore.
    So really, thanks for the tip Ben (and I am really jealous of your snowblower project as well as your transmitter project!!)
    This new gearing also gave me the power I was missing on takeoff to pull 2 of my 3 sons around on their sled... not sure who thinks its cooler, me or my kids lol



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  2. #2
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    hah, that's awesome! I wasnt sure if you could get gears to gear it down, but it is good to know! I am still planning to get me XMAXX....it is just taking longer than I hoped!

    Thanks for the kudos!

  3. #3
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    Any chance someone has an idea how this happened?
    Since I lowered the pinion gear I have run about an hour, mostly plowing. I moved the pinion pins to correspond to my setup...16t/54t.

    So before I go out and replace the spur gear, any suggestions for better quality brand for this part? Whoever said simply "metal is better" was wrong in this case lol

    Also, I guess my X-Maxx will be down for a while as I now have to take much of it apart to get out all those broken metal teeth.
    Should be fun

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  4. #4
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    WOW, I have no clue on how that happened. These come highly recommended by quite a few of the forum guy's, but do your home work on sellers you might find them cheaper.
    https://www.amazon.com/GDS-Racing-Mo.../dp/B01EFCFBNE
    https://www.ebay.ca/itm/GDS-Racing-4...-/283443830167

  5. #5
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Funny, I've always seen when you lower your gear ratio that you have a better chance of popping wheelies. Anyway, to answer your question; it sounds like you are using the stock pin system for adjusting your gearing mesh. If true, I'd consider going to a motor mount, and hand adjusting your gearing mesh.

    I'd do this for two reasons: One, because it a better way to do it (if you know how), and two, because you are towing your youngsters around with your Xmaxx. An Xmaxx isn't really designed for that, so if you want to do it, it's important to be "dead nuts" with all your maintenance and adjustments to eliminate (or at least minimize) any weaknesses in your Xmaxx.
    The ReglarGuy is kid tested and father approved.

  6. #6
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    Also their is no slipper clutch system. There really is no protection from sudden stopping of the tires while under power. You found the weak spot of your driveline. You are plowing with it (Causes extra stress,wear and tear). While moving along (plowing) the whole driveline is turning, when you hit the end of where you plowed that is a shock to the drive line. The stress of plowing is similar to the self-righting feature. If you upgrade the spur gears you could move the weak spot farther down the driveline.

    .

  7. #7
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    Quote Originally Posted by grizzly03 View Post
    Also their is no slipper clutch system. There really is no protection from sudden stopping of the tires while under power. You found the weak spot of your driveline. You are plowing with it (Causes extra stress,wear and tear). While moving along (plowing) the whole driveline is turning, when you hit the end of where you plowed that is a shock to the drive line. The stress of plowing is similar to the self-righting feature. If you upgrade the spur gears you could move the weak spot farther down the driveline.

    .
    Looking at the condition of the spur gear, that really makes a lot of sense. I'm gonna check my LHS to see if they have a spur gear to match the pinion gear I changed... It doesn't even have a scratch on it so I assume it's stronger than the stock material.
    It gave me the reason to take it all apart for the first time. Took me 8 hours to completely strip, clean and reassemble slash 4x4... can't wait to see how long for x-maxx
    I swear upon reassembly there won't be any additional upgrades...

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  8. #8
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    Quote Originally Posted by ReglarGuy View Post
    Funny, I've always seen when you lower your gear ratio that you have a better chance of popping wheelies. Anyway, to answer your question; it sounds like you are using the stock pin system for adjusting your gearing mesh. If true, I'd consider going to a motor mount, and hand adjusting your gearing mesh.

    I'd do this for two reasons: One, because it a better way to do it (if you know how), and two, because you are towing your youngsters around with your Xmaxx. An Xmaxx isn't really designed for that, so if you want to do it, it's important to be "dead nuts" with all your maintenance and adjustments to eliminate (or at least minimize) any weaknesses in your Xmaxx.
    When researching the gearing this is what I took out of it...
    It seems counter intuitive when looking at the result of lowering/raising gears vs. Type of surfaces each should be done for.
    So I kinda guessed and chose lowering it due to the driving style of plowing and the terrain.
    So logically faster acc and less top speed would lead me to beleive it would pop wheelies. But it was a good guess because it really smoother out the torque on takeoff.

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  9. #9
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Quote Originally Posted by B-stinga View Post
    When researching the gearing this is what I took out of it...
    It seems counter intuitive when looking at the result of lowering/raising gears vs. Type of surfaces each should be done for.
    So I kinda guessed and chose lowering it due to the driving style of plowing and the terrain.
    So logically faster acc and less top speed would lead me to beleive it would pop wheelies. But it was a good guess because it really smoother out the torque on takeoff.
    Your paper looks correct to me. Plus, if I was doing with my Xmaxx what you are, I (like you) would lower my gearing too. And, like I said above (and, what your notes show with "Instant Acceleration"), lower gearing ratio's gives you a better chance of popping wheelies. (IMO) you're on the right path by keeping your gearing low and getting a stronger spur gear. The only thing that can stop you (IMO) is if no one makes gears strong enough for what you are wanting to do with your Xmaxx.
    Last edited by ReglarGuy; Today at 04:15 PM.
    The ReglarGuy is kid tested and father approved.

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