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Thread: Tuning '03 suburban with procharger

  1. #1
    Junior Member
    Join Date
    Dec 2005
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    Default Tuning '03 suburban with procharger

    just a few questions.

    1. truck has stock injectors, should I get lucas 42lb'ers or run stock and check duty cycle and afr
    procharger kit is 7-9 lbs
    truck has a rising rate FPR, has no KR, but is running lean
    have not checked with wideband but narrowbands are only getting to 850
    I have an LC-1 and will begin tuning next week

    2. Is this the correct path for tuning?

    a. injector flow rate(if not using stock injectors)
    b. idle tune (if running cam with unstable idle)
    c. autotune VE table
    d. power enrichment tuning
    e. MAF calibration (if still running maf)

    3. when does the vehicle enter PE mode?
    I looked at the parameters under mixture but it doesnt tell me when PE is operating.

    4. should I upgrade to 2 bar map sensor and custom OS to run 7-9 lbs?
    would this be easier to tune with?

    5. after I reset LTFT's, how much driving is required to see the results?
    are reccomended LTFT's different for a boosted vehicle?

    TIA for any help

  2. #2
    Forum tyhee Site Admin GMPX's Avatar
    Join Date
    Apr 2003
    Posts
    12,802

    Default

    Quote Originally Posted by Chunx
    just a few questions.

    1. truck has stock injectors, should I get lucas 42lb'ers or run stock and check duty cycle and afr
    procharger kit is 7-9 lbs
    truck has a rising rate FPR, has no KR, but is running lean
    have not checked with wideband but narrowbands are only getting to 850
    I have an LC-1 and will begin tuning next week

    2. Is this the correct path for tuning?

    a. injector flow rate(if not using stock injectors)
    b. idle tune (if running cam with unstable idle)
    c. autotune VE table
    d. power enrichment tuning
    e. MAF calibration (if still running maf)

    3. when does the vehicle enter PE mode?
    I looked at the parameters under mixture but it doesnt tell me when PE is operating.

    4. should I upgrade to 2 bar map sensor and custom OS to run 7-9 lbs?
    would this be easier to tune with?

    5. after I reset LTFT's, how much driving is required to see the results?
    are reccomended LTFT's different for a boosted vehicle?

    TIA for any help
    A few quick points.

    LTFT's are useless as an indicator to actual mixtures under boost, a normal O2 sensor will not know the difference between 9:1AFR and 13.0:1 AFR.

    I think with 7-9psi you will need to go to a 2bar sensor and ditch the MAF.
    We have a tutorial on how to do this.

    As for PE mode, if you ran with our 2/3bar PCM Operating System then PE mode can be ignored, you can command any AFR at any MAP / RPM you want without worrying about the PCM dropping out of PE mode in boost.

    I am not sure how to setup the Injector/VE tables with a rising reg, others may know?.

    Cheers,
    Ross
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  3. #3

    Default

    Ross,

    With the custom os for 2/3 bar operation, wouldn't it be worth it to ditch the RRFR and just make adjustments through raw tuning?

    I never liked the FMU's that come with most kits but understand that are they because the kits are designed based upon no tuning capability. Since we have control over fueling under boost much better these days, I don't use them.

    Howard

    www.redline-motorsports.net

    1-954-703-5560

    2006 ZO6 895/866 with APS TT
    2010 SSRS Camaro HTR-900TT (798/801)
    2011 HTR-850R Camaro
    2012 ZL1 Auto (10.33@135 MPH) Video Here!

  4. #4
    Junior Member
    Join Date
    Dec 2005
    Posts
    16

    Default

    The regulator came with the kit, I dont think I will use it.
    even though the afr didnt look bad after minor PE adjustments
    but the 150% duty cycle is REALLY scary

    I ordered some 60# shorty injectors and they were too short.
    so now I will have use the long ones with spacers on the fuel rails.

    what is the part number on a 2 bar map sensor?
    I looked in the tutorial and could not find it.

  5. #5
    Junior Member
    Join Date
    Dec 2005
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    16

    Default

    Quote Originally Posted by Chunx
    what is the part number on a 2 bar map sensor?
    I looked in the tutorial and could not find it.
    NM
    the answer is a couple posts below this one

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