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Thread: Confused on IFR settings

  1. #1
    Lifetime Member samh_08's Avatar
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    Default Confused on IFR settings

    Hey guys,
    I have a heads/cam 2005 LQ4 swapped into my 86 monte carlo and I just got some bigger injectors. I got the new LS2 style injectors from Fuel Injector Connection (great guys to deal with) and now I have some tuning questions.

    First of all, I have a returnless fuel rail with a Corvette fuel filter/regulator giving me ~58psi. These injectors are flow matched at 42lbs/hr @ 58psi. My main concern is what value I am supposed to put in table B4001 (IFR.) A constant rate or a slope that rises with vaccum?

    When I called Fuel Injector Connection, they told me to put in the injector tables from a 2006 GTO and calculate IFR for the bigger injectors. Only problem with that is the tables are different from my PCM to the GTO's....

    I posted my current calibration that I have for these injectors. One other thing I would like you to look at is my VE table..I am currently doing AutoVE and my values look pretty high compared to other tunes and I would like to know whats going on.

    Let me know your thoughts, Thanks
    Attached Files Attached Files

  2. #2
    Lifetime Member hquick's Avatar
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    Default

    Copy all of the injector tables from the 06 GTO as suggested by FIC.
    Change the IFR table B4001 to your recalculated IFR's.
    They should be:
    5.292000
    5.324981
    5.357760
    5.390339
    5.422722
    5.454913
    5.486915
    5.518732
    5.550366
    5.581821
    5.613100
    5.644205
    5.675140
    5.705907
    5.736509
    5.766949
    5.797229

    Those numbers are 42lb/hr injectors rated at 58psi running a fuel pressure of 58psi.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  3. #3
    Lifetime Member samh_08's Avatar
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    Default

    I came up with very similar values with the IFR spreadsheet. Are the numbers you posted from somewhere else (I heard you bought the same exact injectors from them.)

    Care to share your tune with me?

  4. #4
    Lifetime Member hquick's Avatar
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    Default Sure thing

    No secrets here...this tune is a product of the EFILive forum and its many teachers
    Keep in mind...mine is a 5.7L supercharged L31 truck motor. Mine are 44lb/hr at 58psi.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  5. #5
    Lifetime Member samh_08's Avatar
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    Default

    Thanks for posting it.

    Couple of things I noticed and have questions about:
    1) {B4006} Small Pulse Threshold is 4 from a 06 GTO and yours is 3.996945. Is there a reason for this?
    2) {B3701} IPW Voltage adjustment varies from all 3 tunes I am comparing. Did you do anything with this table, and why?
    3) {B3704} Injection bank assignments: Your values are different from most tunes I've seen...any reason?
    4) {B4003}, {B4004}, {B4005} All differ from the 06 GTO tune..Again, any reasoning?

    Let me know you thoughts and thanks for the help,
    Sam

  6. #6
    Lifetime Member hquick's Avatar
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    From memory I used a 2002 Camaro settings.
    4 and 3.996945 are the same thing as far as the PCM is concerned.
    Don't think I changed B3701...but I may have. It effects decel fueling, ie..rich or lean on decel.
    B3704 is strange...seems to only be like that for the L31 truck motor.
    03,04,05.....I'd just try them as in the 06 tune suggested by FIC.
    Yours is an 05...and they're the same injectors as in the 06....give it a try.
    There's alot of 'black magic'(and nonsense..so it seems) out there as far as injectors and tuning them goes...and seems to be no 'deffinates'.
    If your injectors are flow matched (and they are), and you have the correct rating (which you do)...that's a good start.
    To answer one of your original questions, sloping IFR for returnless fuel system. Flat line (same value in all columns) IFR for return system.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  7. #7
    Lifetime Member samh_08's Avatar
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    Sounds good. I assume a 2006 GTO has the same regulator as I am using?

    That is probably the main question I have right now, followed by B3701.

    Let me know, Thanks again.

  8. #8
    Lifetime Member hquick's Avatar
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    Default

    Don't know about the reg. If it uses 58 psi as standard fuel pressure...then it'll be fine.
    Just take it easy and look for 'sane' values in logs. Follow the autoVE process.
    Your B3605 looks a little strange with that big cut out in it...but I'm not really familiar with the newer vehicles.
    Are you running OLSD at the moment?
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

  9. #9
    Lifetime Member samh_08's Avatar
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    Yes I am running OLSD right now doing AutoVE which is why B3605 looks weird.

    I was looking at older camaro and trans am tunes and they have the same slope in their IFR table as me. Mine cant be right being they have a return style fuel rail and I do not. Shouldn't I have one value across the board?

    Any thoughts on if I should try to convert the injector timing tables over from the GTO? The table dont exactly match up but could still be important to have right.

    I attached a screenshot of what Im talking about.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  10. #10
    Lifetime Member hquick's Avatar
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    Both those tables use different values.
    I'm not familiar enough with the newer tunes/PCM's.
    Hopefully someone else can chime in.
    I'm a little rushed right now....heading to work. I'll try to take a look at lunch time if nobody else has helped out by then.
    Personally....I'd just try swapping the tables which use the same axis'.
    Howard

    YOU ONLY NEED TWO TOOLS IN LIFE - WD-40 AND DUCT TAPE. IF IT DOESN'T
    MOVE AND SHOULD, USE THE WD-40. IF IT SHOULDN'T MOVE AND DOES, USE THE
    DUCT TAPE.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.


    98 K1500 'HOLDEN' Suburban.
    Custom Whipple SC, Mercruiser Marine intake, 0411 PCM, 4L80E w/shift kit

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