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Thread: Lots of knock 2.4 s/c

  1. #1

    Lots of knock 2.4 s/c

    Not sure what I'm missing, but I lowered timing and still get some serious knock. I haven't logged this car in awhile so either

    A) I am not tuning the timing correctly
    B) H/E pump is dead
    C) A & B

    Attached a tune/log file....any help is appreciated.

    LE5 Supercharged
    - stock pulley
    - 42# injectors
    - stock intake
    2007 Cobalt SS 2.4 5spd SUPERCHARGED

  2. #2
    anyone? can someone check the multipliers? maybe I'm missing some that I don't know of? any help is appreciated.
    2007 Cobalt SS 2.4 5spd SUPERCHARGED

  3. #3
    Advanced Tuner
    Join Date
    Apr 2008
    Posts
    214
    wtf? some of your tables are different from mine... almost as if you are using a different version? some have missing values...

    have you changed your clutch or mounts or anything recently?

  4. #4
    Advanced Tuner
    Join Date
    Apr 2008
    Posts
    214
    im getting what i beleive to be false knock at certain rpms, but i just havent adjusted for it yet as its been cood out.. its always 4 degrees knock no matter how much i increase or decrease timing....

  5. #5
    i've got 6deg of knock in the upper RPM's. I've already lowered timing. I don't know why it continues to knock. I have solid transmission mounts, and clutchmasters fx300 clutch.

    I use hpt 2.22.3152.18236
    2007 Cobalt SS 2.4 5spd SUPERCHARGED

  6. #6
    Senior Tuner Iam Broke's Avatar
    Join Date
    Jul 2009
    Posts
    2,305
    Solid mounts can add to false knock from what I've read. I have 3* KR 5k rpm and above that comes & goes no matter what timing I run also (on an LNF). I gave up trying to pin it down. Only went away on a 98 octane leaded blend that I tried for a tank. (catless) Tried colder plugs also, looked for any mech rubbing, ect. No joy.
    '12 Camaro T3 2SS/RS LS3 M6, SLP TVS 2300, Flex Fuel