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Thread: Tip in throttle causes lean fuel spike and results in heavy knock

  1. #21
    Tuning Addict blindsquirrel's Avatar
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    That datasheet is incomplete.

    Is this Fuel Injector Clinic or Fuel Injector Connection? When there are two of them, just IDing them by 'FIC' is really damn confusing.

  2. #22
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    Guess were all taking a break at the same time Yes in this case what Blind said... Should have one value all the way across in the flow rate and voltage offset tables.
    2010 Vette Stock Bottom LS3 - LS2 APS Twin Turbo Kit, Trick Flow Heads and Custom Cam - 12psi - 714rwhp and 820rwtq / 100hp Nitrous Shot starting at 3000 rpms - 948rwhp and 1044rwtq still on 93
    2011 Vette Cam Only Internal Mod in stock LS3 -- YSI @ 18psi - 811rwhp on 93 / 926rwhp on E60 & 1008rwhp with a 50 shot of nitrous all through a 6L80

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  3. #23
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    Quote Originally Posted by blindsquirrel View Post
    If it's manifold-referenced, it only uses the one single column that matches your base pressure (58psi = 400kPa column) - for both the Flow Rate & that big scary-looking Offset table. Copy the whole column in the datasheet, paste it into every column all the way across.
    Copy that. What's the magic sauce equation for determining what number should go in the Flow Rate vs. Press table? Right now it's 85 across the board, but I don't know how to figure out if it's right or wrong and if wrong, what it should be.

  4. #24
    Tuning Addict blindsquirrel's Avatar
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    Base fuel pressure at the rail, converted to kPa. Find that column in the datasheet.

    Base pressure is what it makes with no vacuum or boost to the regulator reference port. The manifold reference will raise or lower it from the base pressure so that the pressure delta is always the same, therefore the flow rate & offsets will also always be the same.

    Do you have a link to the actual, complete datasheet? Can you answer if it's Connection or Clinic? Can you link to the injector page? Or provide a full part number?

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  6. #26
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    Quote Originally Posted by blindsquirrel View Post
    Base fuel pressure at the rail, converted to kPa. Find that column in the datasheet.

    Base pressure is what it makes with no vacuum or boost to the regulator reference port. The manifold reference will raise or lower it from the base pressure so that the pressure delta is always the same, therefore the flow rate & offsets will also always be the same.

    Do you have a link to the actual, complete datasheet? Can you answer if it's Connection or Clinic? Can you link to the injector page? Or provide a full part number?
    Here's the source data: https://fuelinjectorclinic.com/GM-DATA/EFI-LIVE-0850
    The forum would not allow me to upload the entire workbook due to a data limit size.

  7. #27
    Tuning Addict blindsquirrel's Avatar
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    Jesus, was that spreadsheet made by someone who has never tried to put the data into a tune file? What the hell.

    edit: Oh, that's EFILive format. Whew.

    edit the second: https://fuelinjectorclinic.com/GM-DATA/HP-TUNERS-0850
    Last edited by blindsquirrel; 03-20-2023 at 04:10 PM.

  8. #28
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    Quote Originally Posted by blindsquirrel View Post
    Jesus, was that spreadsheet made by someone who has never tried to put the data into a tune file? What the hell.

    edit: Oh, that's EFILive format. Whew.

    edit the second: https://fuelinjectorclinic.com/GM-DATA/HP-TUNERS-0850
    Eek, sorry, wrong link. Thanks for the correction.

  9. #29
    Tuning Addict blindsquirrel's Avatar
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    https://www.vaporworx.com/shop/produ...or-85psi-6bar/

    Since their system can only reduce pressure from whatever the regulator setpoint is, curious why they didn't recommend this? Or why it's not standard in their kits meant for boosted apps?