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Featured KTuner: It's Official... Rev Hang Defeated

Discussion in 'KTuner Discussions' started by KTuner, Aug 7, 2017.




  1. KTuner

    KTuner Senior Member Elite Sponsor

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    Hello fellow Civic X enthusiasts,

    *UPDATE*
    Thank you to everyone that tested and provided feedback. This is officially available today from the KTuner downloads page as an update.

    Some testers noted that the aggressive on/off throttle without any rev hang was a bit much for their driving style, so we've also included a new Throttle Padding Quick Adjustment which allows for a medium and soft throttle padding setting beyond the standard one.

    We're also testing these settings on CVT to aid with decel and may make that available if the feedback is good. Thanks everyone!
    *END UPDATE*

    It brings us great pleasure to announce a resolution to one of the most annoying issues plaguing all manual Civics... "Rev Hang". You all know what I'm talking about. This has been one of the most mentioned/asked about items we've seen to date!

    CivXRevHangFactory.jpg
    After the throttle has been released completely the throttle plate is commanded to stay open a nominal percentage and slowly come back down to a point where idle control takes over. The blue arrows show the Throttle Plate Command decent after the throttle has been released.

    At higher RPM after the clutch has been engaged there is a slight upswing in RPM (Red Arrow) due to the throttle remaining open this way. At lower RPM it may just hang at that RPM before RPM starts to decent. This creates the sensation of "Rev Hang", a nickname that has been rightly assigned to this behavior.


    We have eliminated this behavior by adding a simple checkbox within the KTuner software.
    CivXRevHangRemoved.jpg
    The blue arrow points out that the TPS and Throttle Plate take an almost identical path after the throttle has been released. With clutch engagement there is no longer a kick upward or hanging of the RPM beyond normal inertia. It is an immediate kick into high vacuum which slows things down and with this higher vacuum this will decelerate the vehicle faster as well.

    We have tried several different approaches to rev hang removal and feel this latest iteration is the least invasive approach to the way the overall system works together. It requires no other adjustments to settings and works well with all of our quick adjustments. It makes shifting in regular and aggressive situations much more natural, like it should be.

    As expected with higher vacuum it does make the transition into deceleration more aggressive and going from deceleration back into normal operation more aggressive as well.

    With this great news we'd like to open this feature up to the Civic X community for user feedback today with a beta version. If you're interested in providing feedback for any of our supported manual transmission CivicX ECUs - Si, Civic 1.5T MT, and Civic 2.0 MT, please contact us directly at Info@KTuner.com

    And for those of you who don't have a manual transmission, we're working on plenty of other options for this platform. Stay tuned!

    Thanks for your support!
    KTuner
     
    Last edited: Aug 9, 2017
    das borgen, NT413, CE1_nobling and 28 others thanked this.
  2. VitViper Senior Member Elite Sponsor

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    A+
     
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  3. 360glitch

    360glitch Moderator Moderator

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    Huge news. Way to go! :drive:
     
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  4. Metal_Hatch Member

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    This sounds awesome!! I will now be seriously thinking about trading in my CVT Sport for a 6MT...if I'm lucky enough to find one!
     
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  5. nathanzachary Senior Member

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    Definitely interested in testing!
     
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  6. KramVT0215 Senior Member

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    You guys make it look so easy! thanks! can't wait to get my V2 on the next batch!
     
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  7. JDM_DOHC_SiR

    JDM_DOHC_SiR Senior Member

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    Awesome!! one of the things I was waiting for!!

    Can't wait to see what else you guys are cooking up @KTuner @VitViper :thumbsup::hmm:
     
    Last edited: Aug 7, 2017
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  8. davemarco Senior Member

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    I was just driving my SI home today, and thought about how strange it was that my car didn't seem to slow down right away when downshifting. If anything, it seem to continue at the same speed for several seconds. This was a sharp contrast to my Prelude, in which I can control my speed very precisely just by shifting. This sounds like one of the few remaining pieces needed to permanently retire the 'lude in favor of my SI!
     
    Last edited: Aug 7, 2017
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  9. cmwalton16

    cmwalton16 Senior Member

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    Email sent guys, thanks for the awesome work!!
     
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  10. cmwalton16

    cmwalton16 Senior Member

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  11. VitViper Senior Member Elite Sponsor

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    Oh so sick!

     
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  12. davemarco Senior Member

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    Do you think that it would be possible to swap to a Single Mass Flywheel in the future, to further decrease the remaining rev hang?
     
  13. VitViper Senior Member Elite Sponsor

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    Yes, but it will require disabling the misfire detection system which will make you non-compliant when it comes to emissions (will fail a readiness test). Thank the EPA for that bullshit.
     
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  14. dallasjhawk

    dallasjhawk Senior Member

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    thats some awesome shade at that dude who got banned on the 10thgen facebook page
     
  15. davemarco Senior Member

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    Man, that blows. Surely there must be other dual mass flywheels lighter in weight than ours though?
     
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