Results 1 to 9 of 9
  1. #1
    Junior Member
    Join Date
    May 2012
    Posts
    7
    My ARRMA vehicles

    Fury

    Arrma transmission gear ratio.

    What is the number of teeth of all of the gears on the Arrma Fury (and all other Arrma vehicles if different)?

    I'm talking about the input gear, idler gear, and diff gear. I'm using this website (http://scriptasylum.com/rc_speed/top_speed.html) to calculate the speed of my RC and I cannot find this needed information anywhere.

    Thanks.

  2. #2
    Senior Member
    Join Date
    Jan 2012
    Location
    Euless, TX
    Posts
    106
    My ARRMA vehicles

    Fury
    Maybe JAM can help out here if he is still reading these forums.

    Dtown

  3. #3
    Junior Member
    Join Date
    May 2012
    Posts
    7
    My ARRMA vehicles

    Fury
    Nevermind, I found it right on the Arrma official website. The internal gear ratio for the Fury is 2.8, probably the same for all Arrma models. Strange how they didn't put that rather vital piece of information in the manual!

  4. #4
    Junior Member
    Join Date
    Apr 2012
    Location
    Aurora, CO
    Posts
    26
    My ARRMA vehicles

    Raider
    So, let's say I replace the stock motor on my Raider with a Leopard Skyrc 3930kv 10T motor and new ESC. Should I gear down my car at all? I have no idea how to determine if I need to and if so, what I should gear it to.

  5. #5
    Member
    Join Date
    Jan 2012
    Location
    Green Bay, WI
    Posts
    59
    My ARRMA vehicles

    Fury
    Quote Originally Posted by hawkbug View Post
    So, let's say I replace the stock motor on my Raider with a Leopard Skyrc 3930kv 10T motor and new ESC. Should I gear down my car at all? I have no idea how to determine if I need to and if so, what I should gear it to.
    My stance is that whern starting with a new motor speedo combo, start geared down (high ratio of pinion to spur) then gear up based on temp at the can. You can always add gearing, but if you fry a motor, your done. :-)
    Thomas

  6. #6
    Junior Member
    Join Date
    May 2012
    Posts
    8
    My ARRMA vehicles

    Fury
    I agree with slider. Especially if its a nonsensored system its best to just start with a small pinion since this will minimize cogging. If the temps are cool and you want more speed, then you can just bump up the pinion incrimentally. If cogging on a nonsensored system is going to be an issue, you will see it when you you gear up.
    Its all a personal preference. I just get super annoyed by cogging so I try to minimize it.

  7. #7
    Junior Member
    Join Date
    May 2012
    Posts
    8
    My ARRMA vehicles

    Fury
    Also, if you are running the stock diff you will likely break it with A 4000 kV motor. That is a lot of power for a 2WD SCT. I run an HPI diff in my Fury. Fits great with a few extra shims over the outdrives (between the outdrives and the tranny bearings). Just an fyi.

  8. #8
    Junior Member
    Join Date
    Apr 2012
    Location
    Aurora, CO
    Posts
    26
    My ARRMA vehicles

    Raider
    Thanks for the info guys. Yes, I have a feeling the diff will go bad quickly with this motor. I'm not going to be running a 3S lipo, so hopefully that will help? I'm not sure. Where can sombody just buy an HPI diff to throw into the chassis on these cars? I have read about how to improve the ones in the car already with thicker washers and thicker pins, but it sounds like a lot of work.

  9. #9
    Super Moderator Jam's Avatar
    Join Date
    Dec 2011
    Posts
    248
    My ARRMA vehicles

    Raider
    Fury
    Vortex
    Mojave
    Granite
    ADX10
    The internal gear ratio for the ARRMA 2wd transmission is 2.6

    The diff gear is 52T, the idler gear is 28T and the input gear is 20T.

    The standard fury gearing is 87T spur and an 18T pinion.

    Start with the standard gearing with a brushless conversion, a 3930kv 2 pole Leopard motor may run quite hot, check your motor temps regularly, if cool go up pinion size or two, if hot - go down slightly.

    Gearing all depends on use, a really good tool for helping set up gears is a infared laser thermometer, I bought one for less than $10 and use it all the time.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •