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Thread: Correct IFR tables for LS3/LS7 injectors in Gen III

  1. #11
    Joe (Moderator) joecar's Avatar
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    Thanks Mick, I appreciate a second set of eyes...

  2. #12
    EFILive Distributor dfe1's Avatar
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    Quote Originally Posted by 5.7ute View Post
    Consider yourself sane. lol.
    I don't know, seems to be that's reaching a bit. The fact that Joecar can figure out these tables doesn't necessarily imply he's sane. After all, like the rest of us, he spends entirely too much time messing with cars.

    I think part of the challenge to understanding these tables is the fact that almost every other manifold-oriented parameter is referenced to manifold pressure, as opposed to vacuum. One is simply the inverse of the other, but sometimes switching back and forth between two perspectives can be confusing. Back in the day, the common reference was manifold vacuum expressed as inches of Mercury. People who used to work with carburetors had to make the transition from thinking in terms of vacuum in inches of mercury to manifold pressure expressed in kPa. I've always found it easier to work with the terms of the relevant measurement units as opposed to trying to convert from one to another. You can't really get a handle on things until you learn to think in the units you're using.
    DigitalEFI- EFILive US Distributor
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  3. #13
    Lifetime Member jfpilla's Avatar
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    Same result use calculator.
    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. #14
    Joe (Moderator) joecar's Avatar
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    Hi Joe,

    My understanding is that they wanted to lift the OEM injector tables, but they didn't fit.

    You have a good point... either way they should still do a sanity check using the spreadsheet IFR calculator.

    Cheers
    Joe
    :^)

  5. #15
    Joe (Moderator) joecar's Avatar
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    lol... my definition of sane is when your math agrees with your measurement, then you're happy...

    edit: ... regardless of your actual mental state
    Last edited by joecar; June 22nd, 2017 at 06:35 AM.

  6. #16
    Lifetime Member jfpilla's Avatar
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    Hey Joe,
    I was using the same idea that you pointed out by getting the IFR values between 400 to 480 to correspond to 0 to 80. There are 6 steps in the LS7 table from 400 to 480 and 17 steps from 0 to 80 in my LS1 table. The calculator seemed like an easy solution.
    Last edited by jfpilla; November 14th, 2009 at 08:35 AM.
    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

  7. #17
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by jfpilla View Post
    Hey Joe,
    I was using the same idea that you pointed out by getting the IFR values between 400 to 480 to correspond to 0 to 80. There are 6 steps in the LS7 table from 400 to 480 and 17 steps from 0 to 80 in my LS1 table. The calculator seemed like an easy solution.
    That solves the problem of how to interpolate the missing steps... good thinking...

  8. #18
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    ok, what about the voltage offsets?
    01 Z06, 4L60E CONVERSION, L92/L76 TOP END, 72# LS3 INJECTORS (THANKS FIC), DRY NITROUS, COS5

  9. #19
    Joe (Moderator) joecar's Avatar
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    Default Voltage offsets

    For voltage offsets, copy this slice from LS9:B1210 to LS1:B3701.

    The DELTAMAP slice 400-480kPa in LS9:B1210 is the MANVAC range 0-80kPa in LS1:B3701.

    You have to copy each cell one at a time, matching up the row and column labels...
    do copy-with-labels from B1210 and paste into a spreedsheet,
    then edit spreadsheet row/col labels to match B3701 (see below),
    also interpolate the in-between cells,
    then paste-with-labels the spreadsheet into B3701.

    to match the rows, subtract 400 from DELTAMAP to get MANVAC... you will need to round to nearest 5...
    i.e.
    400 -> 0
    416 -> 15
    432 -> 30
    448 -> 50
    464 -> 65
    480 -> 80
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by joecar; November 15th, 2009 at 07:39 AM.

  10. #20
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    joe u are something else ill call u on monday...

    thanks again for everyone's help

    Oh one other thing...how do u make a spread sheet to get the missing units? Ive never made a spread sheet... excel, i guess? ive never used MS excel...lol, mabe someone could make if for us? lol HINT HINT...

    thanks again...
    Last edited by WHYTRYZ06; November 15th, 2009 at 08:10 AM.
    01 Z06, 4L60E CONVERSION, L92/L76 TOP END, 72# LS3 INJECTORS (THANKS FIC), DRY NITROUS, COS5

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