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Thread: Injector flow rate

  1. #1
    Junior Member
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    Default Injector flow rate

    Hi guys. I put some injectors in my 04 Silverado SS with the 6.0L from a 04 Sierra 8.1L. I copied and pasted all the injector info from the stock 04 Sierra tune into my tune. I heard they flow at 29.9 lb/hr. So I was going to check my values with RedHardSupra's excel worksheet and with my fuel rail pressure at 58 lbs, and my injector rated fuel pressure at 43.5 lbs. I put in 30 for my injector rated flow rate and for the new information from his calculations.
    Should I put these values in B4001 Injector Flow Rate?
    My old values ranged from a 29.3903 lb/hr @ 0.0psi to 32.3665 lb/hr @ 11.6psi.
    I have not reflashed my pcm to the RHS values yet.
    Thanks for all the help.
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  2. #2
    Lifetime Member 5.7ute's Avatar
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    IMHO I would just use the factory values from the engine you got the injectors from. (as long as that engine still uses 58psi fuel pressure)
    GM has spent a lot of time & money to get these values correct so you would be better off keeping them.
    The Tremor at AIR

  3. #3
    Lifetime Member jfpilla's Avatar
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    Use the attached for future calculations. Yours has some errors.
    Attached Files Attached Files
    2003 red vert
    Mods:
    LS7 crate engine, wet sump, 24xx reluctor
    LPE 100mm MAF
    Vararam, cold air intake and bridge
    RPM Level 6/4L60e trans
    3.42 gears
    Yank SS3600
    1-7/8" AR headers
    Z06 exhaust
    470rwhp 437rwtq
    1/8th mi-1.526-60'-6.862-1/8th-@100.74mph

  4. #4
    Joe (Moderator) joecar's Avatar
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    I looked up 2004 Silverado 6.0L in the Service Manual and it says that it has a manifold-referenced FPR... is this what you have...?

    This means you use the spreadsheet to compute the IFR at MANVAC=0 (i.e. the first cell), and then use this value in all cells (i.e. flat horizontal static)...

    see the first cell in the spreadsheet attached by Joe(jfpilla).

  5. #5
    Joe (Moderator) joecar's Avatar
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    Note: if you do measure your rail pressure, and you have the manifold referenced FPR, you have to disconnect the reference hose from the FPR during the measurement.

  6. #6
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    Sorry I haven't got to this reply sooner. I am not sure what or how my fuel rail pressure is measured. I know it is a returnless system though. I don't have the tools to measure my FRP so I will have to find someone who has the info or tools that I can use.

    I talked to Jesse @ Wait 4 Me Performance and asked him about using the spread sheet to calculate my IFR and he told me that I should stick with the stock GM values, and it don't matter that I put in the tables. As he said I can put 1.0 in the IFR and the PCM automatically compesates the IFR. I have no idea on this one.

    jfpilla, I had the wrong values in the HP Tuners spreadsheet for sure. I noticed I was in the wrong sheet in the middle of the process. As for wrong info in the EFI Live spreadsheet IDK.

    Thanks again for all the help and info guys

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