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Thread: lsa engine will not rev over 4600 rpm sound like its hesitating.

  1. #1
    Tuner in Training
    Join Date
    Jul 2019
    Posts
    17

    lsa engine will not rev over 4600 rpm sound like its hesitating.

    have a lsa swapped vehicle
    1170 cc x spurt injectors
    2.25" upper stock lower
    226/242 @.050" .608"/.605" 114 lsa
    2x walbro 460s in surge tank
    65psi with rising rate and -8 lines to rail

    car seems to fall flat on its face at 4300 rpm and feels like its limited at 4600 will not rev above that can someone please check log and tune it is currently in maf tuning mode as i am tuning maf at the moment ? not sure if im just too rick not allowing engine to rev
    -4 deg pulled on spark table

    changed charger settings was stuck at 4psi and now i can see about 13.8psi after change
    any help would be appreciated uploaded last log and current installed tune
    thanks [ATTACH]106979 [/ATTACH]CURRENT MAF TUNING ! lsa 1kcc injectors -4deg spark maf tuning.hpt
    Attached Files Attached Files

  2. #2
    Tuner
    Join Date
    Jun 2015
    Location
    TN
    Posts
    189
    oil -40.png

    Oil temp.png

    Connect your oil temp sensor, or max this table

    RPS Twin Carbon Clutch
    Kook's Headers
    Ported Supercharger
    Cold Air Inductions cai
    ID850's
    GPTuning 2.5 Cam
    9.1 Lower 2.5 Upper

  3. #3
    Advanced Tuner
    Join Date
    Jun 2014
    Location
    Boulder, CO
    Posts
    202
    If your OS shows this under "Engine Diagnostics" you might try setting it to "Calc ECM"...

    2021-01-30_13-08-30.jpg

  4. #4
    Tuner in Training
    Join Date
    Jul 2019
    Posts
    17
    going to try the ecu temp I think that's what's wrong strange it only started after the cam swap i do not have a oil level/ temp sensor has always been missing using chev performance ecm and harness


    my os is in calc ecm.

  5. #5
    Tuner in Training
    Join Date
    Jul 2019
    Posts
    17
    yep fixed my issue was the engine oil temp for some reason
    thanks