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  1. #1
    RC Racer
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    Need some help with the 3.3

    My 3.3 after a high speed pass will not die down to idle right away, and will idle kind of rough for a little while any ideas of what it could be

  2. #2
    Marshal Double G's Avatar
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    When you let off the throttle and it sounds like Chewbacca then the LSN is lean.
    The Super Derecho

  3. #3
    RC Racer
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    Hahaha chewbacca is one way to put it, thanks for the help Double G

  4. #4
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    Quote Originally Posted by slash4x4baja View Post
    My 3.3 after a high speed pass will not die down to idle right away, and will idle kind of rough for a little while any ideas of what it could be
    If richening the lsn doesn't solve the issue, try this.....

    Get the hsn and lsn to perform good in all areas of acceleration and die at the appropriate time with the pinch test. Then close the idle gap exactly 1/2 turn. At first it will seem like it's idling to low, but that's where it's supposed to idle. The lean condition that causes that problem can be caused by the lsn being closed to far and not getting enough fuel. Or the idle gap being open to far letting in to much air.

  5. #5
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    Quote Originally Posted by Double G View Post
    When you let off the throttle and it sounds like Chewbacca then the LSN is lean.
    If he lets off the throttle and right away it picks up rpm's it means the HSN is lean
    Not LSN. If the LSN is
    Lean after A high speed pass the engine will drop to a idle then begin to
    Pick back up rpms and sound like "chewbacca"

  6. #6
    Marshal Double G's Avatar
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    I see what you're saying, however, I've cut my teeth on a 3.3 engine and did a lot of reading here when I was new. These threads helped me out and I'm pretty sure seasoned veterans would not have steered me wrong:


    http://traxxas.com/forums/showthread...=1#post4019246
    http://traxxas.com/forums/showthread...=1#post4162160
    http://traxxas.com/forums/showthread...78783-New-Revo
    http://traxxas.com/forums/showthread...5185-tunning-s
    http://traxxas.com/forums/showthread...=1#post3759904
    The Super Derecho

  7. #7
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    This is the best tuning guide I have found by far. I've even seen you
    Post it a time or two. (last paragraph)

    http://www.rcnitrotalk.com/forum/showthread.php?t=76808

  8. #8
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    Quote Originally Posted by Kyleb View Post
    This is the best tuning guide I have found by far. I've even seen you
    Post it a time or two. (last paragraph)

    http://www.rcnitrotalk.com/forum/showthread.php?t=76808
    I've never had the hsn cause that problem. When I was first learning to tune and had this issue, the hsn was the first thing I went for. When I richened the hsn enough to make the rpm's drop fast enough, It would just bog. So I put it back where it was pulling strong. So then I tried richening the lsn just a little bit and it would bog on take off then die and not want to start, like if the engine was worn out or something. So I put it back where it launched the best. And out of frustration I turned the idle gap screw like 1/2 turn closed from the factory 1mm and yelled at it, idle right or I'm trading you in. And BAM it was running perfect no matter how I drove it. I thought I scared it. And ever since then after realizing it took all three screws to do it right, I've been able to tune any nitro motor in a couple of minutes and make it run, well, perfect.
    Last edited by Mark Ball; 06-05-2013 at 08:14 PM.

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