Results 1 to 4 of 4

Thread: [ECM] 12098 - Rolling Idle Speed

  1. #1
    Tuner in Training
    Join Date
    Jan 2020
    Posts
    14

    Post [ECM] 12098 - Rolling Idle Speed

    Hi there!
    Hopefully I can get an answer for my question.
    I get very confused because:

    I just pulled my (2018 ZL1 A10 file) noticed something not usual at least for me:

    [ECM] 12098 - Rolling Idle Speed for ZL1

    In [ECM] 12098 - Rolling Idle Speed : Why idle RPM is zero 0 in the first line and the first column?
    Unlike 2018 SS A8 that it is 575 RPM in the same spot in the table.?

    I tried to upload photo but $@%#

    Hopefully someone have a time and looks quick if he has the same or I have something wrong.

  2. #2
    Senior Tuner
    Join Date
    May 2003
    Location
    South FL
    Posts
    1,391
    That is how it is set from the factory. I've often wondered why but never really looked into it. It's likely either not used or the probably that the ECU transitions to idle tables by a certain gear/speed/rpm. I usually change it for cammed cars since other things that affect rolling idle are changed.
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3

  3. #3
    Advanced Tuner
    Join Date
    Aug 2006
    Location
    Arizona
    Posts
    265
    I've wondered the same. I think this table is more heavily referenced in manual cars. I could be wrong
    2009.5 PBM G8 GXP M6 W/Roof-Self tune, OBX LTs, Kooks axleback, LSA blower, cam,
    Monster LT1-SC clutch, flex fuel, 12 psi [email protected] 1,800 D.A
    2007 TBSS-Self tune, bolt ons [email protected], 1,900 D.A
    1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A

  4. #4
    Tuner in Training
    Join Date
    Jan 2020
    Posts
    14
    Thank you both very much, now I am satisfied with the answer about that zero in the table is a valid zero and not an error in reading the file. Thank you very much for the response, I am very grateful..