Consistent feedback knock/fine knock when depressing throttle.
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This is a discussion on Consistent feedback knock/fine knock when depressing throttle. within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; I'm running Cobb OTS Stage 1 91v300 on 93 octane fuel. Tune has been running fine, no knock on WOT, ...

  1. #1
    Registered User olenderc's Avatar
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    Consistent feedback knock/fine knock when depressing throttle.

    I'm running Cobb OTS Stage 1 91v300 on 93 octane fuel.

    Tune has been running fine, no knock on WOT, only I occasionally see a -1.4 blip or so randomly at partial throttle. Seems like it's usually during sudden minor throttle changes. I always drive with the accessport on and live monitoring feedback knock and fine knock learning, which is why I noticed this sudden change in behavior.

    Just today, however, I noticed when shifting around 3k - 4k or higher, I'll get a consistent and reproducible -1.4 knock and around that area, upon lifting my foot off the throttle to change gears. Doesn't happen much at all if I shift at lower rpm's mainly below 2.5k.

    First log is shifting from 1st, through 3rd: https://docs.google.com/spreadsheet/...nc&usp=sharing

    Second log of 3rd gear partial throttle rev then letting off gas: https://docs.google.com/spreadsheet/...3c&usp=sharing

    Third log is of a short WOT in 3rd gear, notice no knock really until the end when I'm letting off the throttle: https://docs.google.com/spreadsheet/...1E&usp=sharing

    Haven't seen this before, I'm not sure what would suddenly cause this, and I'm not sure if this is something to worry about. Thanks for your time.

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    Master Baiter EJ257's Avatar
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    What does Cobb say about this?
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  4. #3
    Registered User olenderc's Avatar
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    Quote Originally Posted by EJ257 View Post
    What does Cobb say about this?
    Haven't thought of contacting them, figured I would ask for some feedback from the knowledgeable tuners on here and proceed from there. Since it's the weekend I don't think I would get a hold of anyone from Cobb.

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