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  1. #1
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    XO-1 Telemetry Math Gone Crazy

    I discovered this a while ago. I didn't really say anything, because at the time I didn't think anyone would be interested. Now though, with the new crop of XO-1 owners wanting to get into Traxxas telemetry, I wanted to point out this little telemetry boo-boo.

    It all started when I wanted to change my gears, but not my gear ratio. The reason? I wanted bigger gears that would give be a bigger space between my motor and my driveshaft. Why? Because, little rocks was tearing up my driveshaft, and I wanted to see if a bigger motor/driveshaft gap would help. I went to the owners manual, and here's what I saw.



    If you only use the (above) formula and gearing chart, you would never see the problem. The problem came when I went to the (below) Traxxas telemetry "GARAGE" and the "MODEL SETUP."



    What is the correct gear ratio for a 14T pinion gear, and a 46T spur gear? Is it 2.846 or 9.35? I plugged in both numbers (even though the 2.846 is a telemetry default) to see what would happen.

    The telemetry default gear ratio of 2.846 was definitely a good number. The owners manual's final gear ratio of 9.36 for gears 14/46 made my speedometer go crazy.

    So, here's what I did to correct this.



    We know that 46/14 is a good number. The number 9.36 proved to be a bad number when used with Traxxas' telemetry. And, 2.83 proved to be a bad number in our owner manual's formula, but is a good number when used as or final gear ratio default setup.

    So, what needed to be done was to take our Traxxas formula, use the 46/14, make 2.85 unknown (or X), and use our proven 2.842 telemetry number as our formula's solution.

    If we do that, our new corrected formula for our owner's manual is: Spur/Pinion (times) .865 = Final Gear Ratio

    Now, when we use our new corrected formula for our first step: 46/14 = 3.2857

    And, for our second and final step: 3.2857 x .865 = 2.842 (the number used as our default final gear entry, in our Traxxas telemetry setup)

    In conclusion, I have the spacing I wanted, and am able to keep my original OEM gear ratio. I had my choice of using either 54/17 = GR 27476 or 54/16 = GR 2.919. I went with the gear ratio of 15/17. When I plugged in all the numbers into my Traxxas telemetry program, everything worked very well, my top speed was 58mph, and no more shredding of my driveshaft from rocks.
    Last edited by ReglarGuy; 02-24-2018 at 06:29 AM.
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  2. #2
    RC Qualifier kzsteve's Avatar
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    WOW you spent some time on that . I haven't got that far yet , but thank you for the effort . should help many users ... steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  3. #3
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    so if I use the 34t pinion and 46 spur I should put 2.11 in my final drive on link app?
    Last edited by cliffr17; 02-24-2018 at 02:28 PM.

  4. #4
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Spur/Pinion (times) .865 = Final Gear Ratio
    46/34 = 1.3529

    1.3529 x .865 = 1.170 Final Gear Ratio for the Traxxas Link
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  5. #5
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    ok thanks. I actually got that number first, but thought that can't be right.lol.


    thanks again for all your help.

  6. #6
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    You're very welcome.
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  7. #7
    RC Qualifier kzsteve's Avatar
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    does anyone make a 3 pin telemetry expander ? or adapters for 4 pin ? ......... thanks .. steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  8. #8
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    For inexpensive and simple installation, all you should ever need is the Traxxas telemetry stuff. They make everything you could possibly ever want for telemetry.
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  9. #9
    RC Qualifier kzsteve's Avatar
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    yes they do . the expanded telemetry I got is all 4 pin , my stuff is all 3 pin . thanks ... steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  10. #10
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    What's 3 pin?
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  11. #11
    RC Qualifier kzsteve's Avatar
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    my telemetry box . plug ins are 3 pin , but my expanded telemetry is all 4 pin . ........... thanks .. steve

    -- all my plugins are 3 pin . servos , etc .
    XO-1 GUY GETTING OLDER BY THE MINUTE

  12. #12
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    If you have and are using all Traxxas electronics...everything fits. The 3 pinned servos and basic temp/volt and RPM sensor all go in the 3 pin area of the receiver; and the expansion modules 4 pin cable goes in the 4 pin slot of the receiver and in the 4 pin slot of the expansion module (along with any smart sensors which are also, 4 pinned).
    The ReglarGuy is kid tested and father approved.

  13. #13
    RC Qualifier kzsteve's Avatar
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    thanks . I think I got that . new problem . LOL seems all I have are problems . when trying to bind transmitter to receiver .........
    red light goes to fast blinking red but never goes to green ............. thanks again .... steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  14. #14
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Assuming you're doing everything right, I would swop out your receiver with a known good. If no results, then the transmitter. It's got to be one or the other. Note: make sure you don't use your telemetry to bind. Use only your Tx and Rx buttons the way the owners manual tells you.
    Last edited by ReglarGuy; 03-09-2018 at 07:56 PM.
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  15. #15
    RC Qualifier kzsteve's Avatar
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    that is a major assumption . I have 2 transmitters & 3 receivers , the one I have in is the best effort so far . I think I have unhooked all the telemetry , but will go over it again tomorrow . staring to feel really stupid about now , but I do preserver to the end . thanks once more ................ steve ................... if I figure it out I will let you know !
    XO-1 GUY GETTING OLDER BY THE MINUTE

  16. #16
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Make sure you consult your owners manual, and (if need be) you can look up how to do it on YouTube. I use YouTube a lot with computer, home networking, and iPad issues I can't figure out on my own. It's comes in handy.
    The ReglarGuy is kid tested and father approved.

  17. #17
    RC Qualifier kzsteve's Avatar
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    ive been using some tutorials on line . down loaded manual for xo-1 . working on my hot rod today , but later on xo-1 ........... thanks .. steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  18. #18
    RC Qualifier kzsteve's Avatar
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    got my control & receiver working together . all green lights , but no steering or motor functions . any ideas appreciated ........ thanks .. steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  19. #19
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Unfortunately, we can't get together for me to see exactly what you have, and exactly what you're doing. I suspect that due to your experience level you may be overlooking tidbits of information that might be important in solving your problem. Not a big deal, let's see if we can go another route that might get you better results...quicker.

    A forum isn't bad for simple questions and answers, but for trouble shooting serious problems a telephone is much better and faster. I suggest calling your nearest hobby store, Traxxas, or me. With that said, let me tell you how I get to the bottom of my RC electronic problems fast.

    I use the substitute method. I keep in a box a new, known good transmitter, receiver, 4 servos, 6vdc battery pack, a servo tester, MM2 ESC, an extra iPod, a smart temp sensor, and a brushless motor tester. Also, all my surface vehicles' electronics are the same (Traxxas), and all my air vehicles electronics are same (Spectrum).

    You may want to do this for yourself (in the near future) for your trouble shooting needs, but until then I think you should do as I suggested above. You should call your nearest hobby store, Traxxas Customer Service, or me; because I think your needs are more than what can be efficiently done on a forum. If you need/want to get a hold of me by phone, I don't mind and we can Private Message the necessary arrangements.
    The ReglarGuy is kid tested and father approved.

  20. #20
    RC Qualifier kzsteve's Avatar
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    REG GUY .. I finally got the car sorta out . ive run it some & no problems so far . apparently my esc was bad . 2 of them in a row . blx-180 blx-185 (replacement for blx-180). I'm going to stay with GOOD parts rather than cheap parts . I want to thank you for your help & info . apparently I bought a USED & mismatched left overs . the learning curve took me awhile to grasp ................. thank you again .... steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  21. #21
    RC Qualifier kzsteve's Avatar
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    I now have a Bluetooth transmitter . I can hook it up to the traxxas app & modify it thru my phone , but it will not read temp or rpm , nothing . what do I check or do to fix this ? ............ thanks .. steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  22. #22
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    I want to thank you for your help & info. Apparently, I bought a USED & mismatched left overs.
    You are very welcome. But, yes, I knew you weren't trouble shooting with components that were 100% good, because if you do in the future what I wrote to you above you will always get to the cause of your problem.

    I use the substitute method. I keep in a box a new, known good transmitter, receiver, 4 servos, 6vdc battery pack, a servo tester, MM2 ESC, an extra iPod, a smart temp sensor, and a brushless motor tester. Also, all my surface vehicles' electronics are the same (Traxxas), and all my air vehicles electronics are same (Spectrum).
    Above is what I wrote you.

    It will not read temp, rpm , or anything.
    I would call Traxxas on that one, because I know there was an update a little while ago, and people have been having issues with it.
    Last edited by ReglarGuy; 04-16-2018 at 06:36 PM.
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  23. #23
    RC Qualifier kzsteve's Avatar
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    again thank you . I'm learning from the forum , slow learning curve , but getting there . when I got the car running again , I set it on normal mode , darn fast until I hit the tree . no harm but reset it to training mode . LOL I will call traxxas this morning . thanks ............ steve
    XO-1 GUY GETTING OLDER BY THE MINUTE

  24. #24
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    So since I switched to a 18t pinion with the stock 46 spur I came up with 2.210 does that sound about right to you?

  25. #25
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    I was looking in the telemetry after reading this post and noticed a help button, it says “drive ratio refers to the transmissions gear reduction ratio. Unless you have changed the internal gears of your transmission, you will not need to alter the drive ratio value. Drive ratio represents the transmissions gear reduction. So would this math still apply since all we really need to do is input the pinion and spur size?

  26. #26
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Yes, if you change your pinion and spur you will need to use the above corrected formula to get your telemetry to report correctly. The reason for this is due the original Traxxas formula having a incorrect multiplier. So, if you change your pinion/spur be sure to use the corrected formula Spur/Pinion (times) .865 = Final Gear Ratio instead of Spur/Pinion (times) 2.85 = Final Gear Ratio, and your Traxxas link app will work right.
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  27. #27
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    Iím pretty sure the 2.865 is the math to get the overall ratio, it says in the app that unless youíve changed the internal gears (ring/pinion) this number isnít to be changed just the pinion and spur numbers are all it says we are to adjust, I swapped my 14t pinion to a 18t and only changed those values in my app and it reports back correct speeds showing around 65mph. Go into your app on the page that you change the value on and click help then select the ratio, theyíve made this more confusing than it needs to be but that explains it pretty well.

  28. #28
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Glad to hear it. I think you should do what you think is best. For me, the original formula didn't work, and if you read my initial post I mathematically show you why it didn't work for me. One thing about math is it doesn't fib.
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  29. #29
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Quote Originally Posted by ReglarGuy View Post
    Glad to hear it. I think you should do what you think is best. For me, the original formula didn't work, and if you read my initial post I mathematically show you why it didn't work for me. One thing about math is it doesn't fib.
    Take a closer look at the picture (photo #1) of the Traxxas owner's manual gearing chart for 46/14 gearing, and use its' 9.35 final gear ratio value in your Traxxas link. If you do your Traxxas Link app won't work.

    Next take a look at the picture (photo #2) of the Traxxas Link's final gear ratio of 2.846 used with 46/14 gears. If you use this 2.846 value with 46/14, your Traxxas app works. Right there, that should tell you something's wrong. Why the two (one working/one not working) published values? The good news is; as long as you use 46/14 gears in your XO-1, use your Traxxas Link's default values of 46, 14 and 2.846 in your Traxxas Link app, then you're good to go.

    The problem is when you change your XO-1 gears, and use the Traxxas owners manual's formula (photo #1) for figuring out the new final gear ratio needed for your Traxxas Link app. Using the owner's manual's 2.85 multiplier mathematically can't work. To get the proper final gear ratio value for your Traxxas link app you have to use .865 instead of 2.85. I mathematically prove this in (photo #3).

    One thing about math; it never lies. However, if you are able to change your XO-1 gears, use the original Traxxas gear ratio formula "Spur/Pinion (times) 2.85 = Final Gear Ratio," and can get your telemetry to work right...God bless you, brother. I personally couldn't. I had to correct the math and use Spur/Pinion (times) .865 = Final Gear Ratio to get my telemetry to work right after a gear change.
    Last edited by ReglarGuy; 11-18-2019 at 05:47 AM.
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  30. #30
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    Hey ReglarGuy,

    The gear ratio of the diff and drive shaft pinion, is 2.846, which is the result of dividing 37 (diff gear teeth) by 13 (pinion teeth).

    Are you saying that the Traxxas Link app does not properly utilize this ratio with all possible combinations of motor pinion and spur gears? That the app has some sort of mathematical error in itís logic when something other than 46 spur / 14 motor pinion is used?

    Just trying to understand your position on this. Thanks.

  31. #31
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    How/Why do you have two "drive ratio gears" on your Traxxas Link app? All mine have one "drive ratio gear". Looks like you have two gear reductions.
    Last edited by grizzly03; 11-18-2019 at 02:41 PM.

  32. #32
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    Oh yah, just noticed the same thing. Mine has only ever referenced Drive Ratio Gear 1.

    My app version is 7.2.0.10671.


  33. #33
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Quote Originally Posted by grizzly03 View Post
    How/Why do you have two "drive ratio gears" on your Traxxas Link app? All mine have one "drive ratio gear". Looks like you have two gear reductions.
    I don't know why that is. It's my default setting, though. The only thing I can think of (if I have one and you have two) is I don't update my iPods or Traxxas Link. They haven't been updated since the Xmaxx came out. Once I got the RC vehicles I wanted (and, I got all my stuff working with Apple and the Traxxas Link) I left it alone. That way I don't have to worry about a bad update from Apple or Traxxas screwing up all my telemetry stuff. I have iPods rather than iPhones, so I can do that. The only thing I use my iPods for is my Traxxas link...nothing else. Since doing that I haven't had any telemetry issues. Which make me happy.
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  34. #34
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    Glad it works for you. Just odd yours shows two reductions. Do all your vehicles show two?

  35. #35
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    Quote Originally Posted by ReglarGuy View Post
    I don't know why that is. It's my default setting, though. The only thing I can think of (if I have one and you have two) is I don't update my iPods or Traxxas Link. They haven't been updated since the Xmaxx came out. Once I got the RC vehicles I wanted (and, I got all my stuff working with Apple and the Traxxas Link) I left it alone. That way I don't have to worry about a bad update from Apple or Traxxas screwing up all my telemetry stuff. I have iPods rather than iPhones, so I can do that. The only thing I use my iPods for is my Traxxas link...nothing else. Since doing that I haven't had any telemetry issues. Which make me happy.
    Itís almost as if the app thinks youíre running a transmission with a high and low gear option. Like the Summit. Strange but glad you got it working with your setup.

  36. #36
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Quote Originally Posted by grizzly03 View Post
    Glad it works for you. Just odd yours shows two reductions. Do all your vehicles show two?
    Nope, just the OX-1 link.
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  37. #37
    RC Turnbuckle Jr. ReglarGuy's Avatar
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    Quote Originally Posted by gusd2 View Post
    It’s almost as if the app thinks you’re running a transmission with a high and low gear option. Like the Summit. Strange but glad you got it working with your setup.
    It is weird. What I do is set both to the same value.
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  38. #38
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    Quote Originally Posted by gusd2 View Post
    Hey ReglarGuy,

    The gear ratio of the diff and drive shaft pinion, is 2.846, which is the result of dividing 37 (diff gear teeth) by 13 (pinion teeth).

    Are you saying that the Traxxas Link app does not properly utilize this ratio with all possible combinations of motor pinion and spur gears? That the app has some sort of mathematical error in it’s logic when something other than 46 spur / 14 motor pinion is used?

    Just trying to understand your position on this. Thanks.


    No, if you use the Traxxas formula for 37/13 it is: Spur (37)/Pinion (13) multiply by 2.85 = Final Gear Ratio (8.11).

    If you use the Traxxas formula for the stock gearing of 47/14, then Spur (47)/Pinion (14) multiply by 2.85 = Final Gear Ratio (9.56) which is what is GREEN on the gearing chart (above).

    If you plug in the either one of the above two above examples into the Traxxas Link you will give you a crazy result with the speed/RPM telemetry. That's the problem I'm speaking of. I came a crossed it when I wanted to change my gearing from 47/14 to 50/17.

    Looking at the above chart and formula I should plug in 47, 14, (gears) and 9.56 as my final gear ratio, but when you do it doesn't work.



    You have to use 47, 14, and 2.846. (above) So, which is correct? The 47, 14, 9.56 (chart) or the 47, 14, 2.846 (Traxxas Link). The 47, 14, 2.846 works. The 47, 14, 9.56 doesn't.

    Do to this, I did this (below).



    I know that 47, 14 and 2.846 are good numbers, because it's 47 and 14 are the gears that come stock with the XO-1. I know 2.846 is a good number, because it's my default Traxxas Link setup, and it works with XO-1's stock gearing. The questionable number is the Traxxas multiplier 2.85 (shown below in GREEN).



    Converting 2.85 to an unknown, and solving for "X". My new multiplier is .865 instead of 2.85 (below).



    Now when we use our corrected formula we get:

    47/14 (times) .865 = 2.90 Final Gear Ratio (which is a lot closer to the Traxxas link value 2.846 (that works) than the chart value of 9.35 (that doesn't work).

    Your example: 37/13 (times) .865 = 2.46 Final Gear Ratio.
    And my gear change example, 50/17 (times) .865 = 2.54 Final Gear Ratio.
    Last edited by ReglarGuy; 11-19-2019 at 06:45 AM.
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  39. #39
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    In Conclusion



    If I use the Traxxas formula (above) for my final gear ratio's, I get:

    Stock gearing 47/14 (times) 2.85 = 9.35 Final Gear Ratio
    Your example 37/13 (times) 2.85 = 8.11 Final Gear Ratio
    My gear change 50/17 (times) 2.85 = 8.38 Final Gear Ratio

    If I use the corrected formula (below) for my final gear ratio's I get:

    Stock gearing 47/14 (times) .865 = 2.90 Final Gear Ratio
    Your example 37/13 (times) .865 = 2.46 Final Gear Ratio
    My gear change 50/17 (times) .865 = 2.54 Final Gear Ratio



    I can't speak for the 37/13 and 2.46 final gear ratio (I never used it), but I can with the stock gearing 47/14 (times) .865 = 2.90 Final Gear Ratio, and the 50/17 (times) .865 = 2.54 Final Gear Ratio (which uses my corrected formula). They both work with the Traxxas Link app.

    The 47/14 (times) 2.85 = 9.35 Final Gear Ratio and the 50/17 (times) 2.85 = 8.38 Final Gear Ratio (which uses the Traxxas owner's manual formula) doesn't work with the Traxxas Link app.
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  40. #40
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    P.S.
    I made a couple slight typing boo-boo's. The stock gearing is 46/14 not 47/14, but the mathematical principles used to correct the Traxxas owner's manual's formula are still the same.

    Also, in Green on the gearing chart is 9.35, and the Traxxas multiplier is 2.85 and is not in Green on the gearing chart. It's used in the formula on the right hand side of the gearing chart. I'm sure, even with these few little boo-boo's, members should be able to see what's goin on between the two formula's. Sorry for the boo-boo's fella's. I started my reply at 4:00 am. I guess I wasn't quite awake yet. (lol)
    Last edited by ReglarGuy; 11-19-2019 at 11:16 AM.
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