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

  1. #151
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by dian View Post
    on second thought, i have no idea what the labels are on the l96. i thought thay were hektopascals. just curious.
    I'm not sure what you mean...?

    The axis is on kPa...

    post a screenshot of what you're seeing.

    ~ posted by phone ~
    Last edited by joecar; June 21st, 2017 at 05:30 AM. Reason: grammar

  2. #152
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    under l96 i see labels from 128 to 768. the values in the tables are different. but i probably misunderstend something.

  3. #153
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Whipped383 View Post
    Attachment 20465

    This appears to be the correct file for the injectors in question
    Quote Originally Posted by dian View Post
    under l96 i see labels from 128 to 768. the values in the tables are different. but i probably misunderstend something.
    In the tune file attached to post #132 above, the axis of table B4001 has those labels.

    Those labels are injector pressure delta (difference from top to bottom of injector) in kPa.

  4. #154
    Joe (Moderator) joecar's Avatar
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    So if rail pressure measures 400 kPa (58 psi) (i.e. gauge pressure is 400 kPa, so absolute pressure is 500 kPa)

    then injector pressure delta = 500 - MAP

    so then the usable range of the axis on B4001 are as follows:

    • NA: 408 to 468 kPa (400 kPa has to be interpolated by ECM)
    • 1-bar boost: 308 to 468 kPa
    • 2-bar boost: 208 to 468 kPa

  5. #155
    Junior Member spedracr93's Avatar
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    Quote Originally Posted by joecar View Post
    In the spreadsheets, the LS1B paste-able tables are labelled.
    The tables in these spreadsheets are great, but don't the numbers only work if the Fuel Rail Pressure is 58 psi?

    Is there a conversion possible to use LS3 injector data at a different Fuel Rail Pressure? Say... 44 psi?

  6. #156
    Joe (Moderator) joecar's Avatar
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    Yes 58 psi.

    You can scale the IFR table using by multiplying by sqrt(44/58).

  7. #157
    Junior Member spedracr93's Avatar
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    Quote Originally Posted by joecar View Post
    Yes 58 psi.

    You can scale the IFR table using by multiplying by sqrt(44/58).
    That makes a large difference. Thanks for the formula!

    58 to 44 is a 12.9% difference.

    Can rail pressure affect Minimum Injector Pulse Width? I realize it's a measure of opening time, but it seems like the volume injected at a lower pressure would be less within that time and a compensation could be to modify that minimum time.

  8. #158
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by spedracr93 View Post
    That makes a large difference. Thanks for the formula!

    58 to 44 is a 12.9% difference.
    Yes, scales by 0.871.

    Can rail pressure affect Minimum Injector Pulse Width? I realize it's a measure of opening time, but it seems like the volume injected at a lower pressure would be less within that time and a compensation could be to modify that minimum time.
    It can... I don't know how to calculate the new minimum.

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