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  1. #1
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    Question Bump steer (suspension steer) problem!

    Emaxx 3906....when the front suspension compresses, the wheels both turn to the outside. The left to the left, and the right to the right. I've tried rearranging the turnbuckles on top, bottom, and every which way where they connect to the bellcranks and the knuckles and I still acn't fix it. All that did was make it even worse.
    Is this normal? I want to make it so the a arms are flat, to improve handling, but I can't because when they get to that point the wheels are pointing out in opposite direction. It's not huge, but its enough to be an annoyance and prevent the truck from rolling good. And it will probably cause a ton of bump steer, too. Can you guys please help me out here? All of the parts including the turnbuckles are stock.
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  2. #2
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    Just throwing an idea out there. What if you leveled your A-arms then tried to adjust the depth the pivot balls on the axle carrier are set? I know that the axle carriers/pivot balls are more for setting camber but maybe the angle they are at when the A-arm is level, they are pulling at your turnbuckles and forcing your wheels to toe out.

    Just a thought.

  3. #3
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    They toe out quite a bit that little bit of adjustment won't fix it. Thanks much for the effort though.
    In fact I have them all the way in so it wouldn't make any difference.
    Is it normal for the wheels to toe out when the suspension compresses?
    Where do I find an assembly diagram for the steering assembly or the whole truck?
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  4. #4
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    That's normal.
    Here's how I adjust mine.
    Best to put your batteries in the truck. Use the shock spacers to get the arms sitting where you want them after you've compressed and released the trucks suspension. Arms level (flat) is how I run mine.
    With it still compressed adjust your camber with the pillow balls, I like about 1 degree camber all around.
    With it still compressed adjust your toe, I like 0 degrees in the front and about 3 degrees toe-in for the rear.
    That should get it running straight and handling will be excellent.

  5. #5
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    I figured it out! I got it so the wheels stay straight no matter how high or low the suspension is!
    Thanks for your help, guys.
    After I get my new motor, driveshafts, and spur gear in the mail It will be up and running! It will be the first time I will have driven an emaxx. (besides once in the snow). Can't wait
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  6. #6
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    Quote Originally Posted by upbasher View Post
    I figured it out! I got it so the wheels stay straight no matter how high or low the suspension is!
    Thanks for your help, guys.
    After I get my new motor, driveshafts, and spur gear in the mail It will be up and running! It will be the first time I will have driven an emaxx. (besides once in the snow). Can't wait
    Well... how did you do it??

  7. #7
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    I made it like this.(remeber I have a 3906 maxx)
    Turnbuckle goes on top where they connect to the bellcrank, and put the other end on the bottom where they connect to the knuckle!
    Then I just adjusted the turnbuckles' toe in an out.
    Works perfect the wheels stay perfectly straight no matter where the suspension is!
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  8. #8
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    Cool, glad it worked for you.

  9. #9
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    Pics please, i think i get what you'er saying, but i want to be sure.
    "American Muscle beats import any day of the week"

  10. #10
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    Quote Originally Posted by upbasher View Post
    (remeber I have a 3906 maxx)
    Turnbuckle goes on top where they connect to the bellcrank, and put the other end on the bottom where they connect to the knuckle!
    Just checked my 3906 and you have it correct now. You'll still have a little bump steer because it's the nature of turnbuckle suspension but I bet it will drive much better .

    You'll have a Blast with the Maxx!!!

  11. #11
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    Great! I can post pics if Someone is willing to post them for me, powertothemaxx. I don't have a photobucket account.
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  12. #12
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    Quote Originally Posted by upbasher View Post
    Great! I can post pics if Someone is willing to post them for me, powertothemaxx. I don't have a photobucket account.
    Their free for a basic account. It's what I use to post pictures. But, yeah, I'm sure we can help you post up some pictures.

  13. #13
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    Quote Originally Posted by M n M View Post
    Their free for a basic account. It's what I use to post pictures. But, yeah, I'm sure we can help you post up some pictures.
    Okay if you pm your email address I will send them to you so you can post em. But I don't think pictures are necessary to explain what I mean here.
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  14. #14
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    PM sent to you Upbasher.

  15. #15
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    Quote Originally Posted by M n M View Post
    PM sent to you Upbasher.
    responded thanks M n M
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  16. #16
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    I've never noticed my wheels pointing out/in when the truck is pressed down. hmmm i need to check.
    Problems.The manual's good starting point. Simple

  17. #17
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    Ya, I've never noticed being enought that it interfered with my truck anyway. It might just be a 3906 thing
    "American Muscle beats import any day of the week"

  18. #18
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    Posted for Upbasher:


  19. #19
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    thats how mine is set up, isn't that the normal way.
    mine moves slightly but not a great deal.
    If you have your truck sittin very high it will have a greater effect when compressed. as the toe link pushes out when it's level with the bellcrank, then back in again above that point.like this shape ).
    Get a good suspension so there more resistive travel keeping the arms level and below or above to shorten the travel and you shouldn't really notice it running.
    Last edited by trax de max; 04-13-2012 at 04:25 AM.
    Problems.The manual's good starting point. Simple

  20. #20
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    Those look like different knuckles than what come on the 3908.

  21. #21
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    Quote Originally Posted by bentrocker View Post
    Those look like different knuckles than what come on the 3908.

    They are different the ones that come with the 3908 are much bigger and heavier and they have those rubber boots on the ball joints. The bearings are also different.
    This is a 3906 emaxx.

    Quote Originally Posted by trax de max View Post
    thats how mine is set up, isn't that the normal way.
    mine moves slightly but not a great deal.
    If you have your truck sittin very high it will have a greater effect when compressed. as the toe link pushes out when it's level with the bellcrank, then back in again above that point.like this shape ).
    Get a good suspension so there more resistive travel keeping the arms level and below or above to shorten the travel and you shouldn't really notice it running.
    It goes all the way up and down without moving at all.
    Last edited by cooleocool; 04-13-2012 at 04:08 PM. Reason: post merge
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  22. #22
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    i'd like to see a vid of that. and how it's set up. If it's not moving then the pressure is going to the bellcrank and pushing in there.
    Maybe it has a crack in it.or the hollow balls is missing leaving the movement in there.
    Problems.The manual's good starting point. Simple

  23. #23
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    Quote Originally Posted by trax de max View Post
    i'd like to see a vid of that. and how it's set up. If it's not moving then the pressure is going to the bellcrank and pushing in there.
    Maybe it has a crack in it.or the hollow balls is missing leaving the movement in there.
    No not at all nothing is broke I know for sure. I just took the entire truck all apart and NOTHING was broke in any way.
    Everything is in great shape no cracks at all and the balls are tight.
    And the bellcranks do not move the servo is in there. It would move the servo if tehy were and its not. I also watched very carefully and no movement whatsoever.
    "I like rc cars"....."WHAT? YOU'RE KIDDING!"

  24. #24
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    Quote Originally Posted by upbasher View Post
    Works perfect the wheels stay perfectly straight no matter where the suspension is!
    Cudos for this! Indeed works perfect for the stock suspension!
    Recovering Nitro Addict...

  25. #25
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    Tinpic.com works great no account needed.

  26. #26
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    Those look like different knuckles than what come on the 3908.
    Last edited by lbourgoin4; 04-20-2012 at 01:51 AM.

  27. #27
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    Quote Originally Posted by lbourgoin4 View Post
    Those look like different knuckles than what come on the 3908.
    Indeed they are. The ones pictured are the original Maxx knuckles.

    The 3908 knuckles first appeared on the Revo and Traxxas adapted
    them to other models.
    Recovering Nitro Addict...

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