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Thread: Start up RPM hanging

  1. #1
    Junior Member
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    Jun 2016
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    Default Start up RPM hanging

    Hi guys,

    what tables to correct hanging rpm's on the start up? when I start the vehicle it goes all the way to 2000Rpm's and hangs up there for 2-3 seconds then drops slowly to the desired set rpm!

    any thoughts on how to fix this?

    Thanks,
    00 Camaro Z28
    398ci lq9 w/ ls9 heads , Holley Hi ram intake
    Th-400 , 5k stall
    9.7 cr - 94mm BW Turbo
    Super Street
    -------------------------------------------------------------
    03 Sierra, L92
    398Rwhp/416Rwhp

  2. #2
    Joe (Moderator) joecar's Avatar
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    Default

    Post tune/log files.

    How does it run otherwise...?

  3. #3
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    Jun 2016
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    Default

    Hi Joe,

    The car runs great making 400/400+ rwhp & Tq on a 6.0, untouched rectangular port heads and a 220/230 117+4 cam on a truck with 32" tire .

    Still believe it needs some fine tuning at idle and such...etc.

    I played little bit with table B4604 [Startup RPM Offset] and seems that the problem has been resolved. But not quite sure if this the correct approach in such issues.

    Any suggestions?
    Attached Files Attached Files
    00 Camaro Z28
    398ci lq9 w/ ls9 heads , Holley Hi ram intake
    Th-400 , 5k stall
    9.7 cr - 94mm BW Turbo
    Super Street
    -------------------------------------------------------------
    03 Sierra, L92
    398Rwhp/416Rwhp

  4. #4
    Joe (Moderator) joecar's Avatar
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    Apr 2003
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    28,403

    Default

    There's an idle tuning tutorial thread here, let me find it.

  5. #5
    Junior Member
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    Jun 2016
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    Default

    Quote Originally Posted by joecar View Post
    There's an idle tuning tutorial thread here, let me find it.
    Wondering if this tutorial covers startup
    00 Camaro Z28
    398ci lq9 w/ ls9 heads , Holley Hi ram intake
    Th-400 , 5k stall
    9.7 cr - 94mm BW Turbo
    Super Street
    -------------------------------------------------------------
    03 Sierra, L92
    398Rwhp/416Rwhp

  6. #6
    Lifetime Member
    Join Date
    May 2012
    Posts
    303

    Default

    MAybe startup airflow and decay? post a log and tune file

  7. #7
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by maalmull View Post
    Wondering if this tutorial covers startup
    It doesn't.

    Quote Originally Posted by 400ss View Post
    MAybe startup airflow and decay? post a log and tune file
    Godd idea... start with stock values and go from there.

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