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Thread: Need LS3 Injector Information

  1. #1

    Default Need LS3 Injector Information

    So my setup is as follows: LQ9 short block (cast iron LS2 pretty much), with a full LS3 top end (intake, injectors, heads, etc.).
    I already loaded my ECU with the LS2 base calibration, and made sure all my sensors & stuff are setup properly, but I'm not
    sure on what to set the LS3 injectors too. Like the dead time & stuff. Wondering if somebody could help me out with this.

  2. #2
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    Quote Originally Posted by 1320king View Post
    ...but I'm not sure on what to set the LS3 injectors too. Like the dead time & stuff. Wondering if somebody could help me out with this.
    It's LSx engine related...isn't that information available on the internet?
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3

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    I thought maybe there was a Holley file or something that I could have just loaded. Danny, do you happen to have a screen shot of an LS3 map? I can't seem to find a base calibration LS3 HP EFI map to save my life.

  4. #4
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    Quote Originally Posted by 1320king View Post
    Danny, do you happen to have a screen shot of an LS3 map? I can't seem to find a base calibration LS3 HP EFI map to save my life.
    No, I don't...sorry.
    Just need to program the correct information into the Engine Parameters, Ignition Parameters, Sensors, Idle & Spark ICFs.
    http://documents.holley.com/techlibr...librations.pdf (Base Calibrations)
    http://documents.holley.com/techlibr...r10546rev1.pdf (Quick Start Guide)

    Remember, the base calibration you start with, must correspond to the MAP sensor you're using:
    For example, you can't use a naturally aspirated base calibration for a forced induction engine.
    This is because the 2,3,5 bar MAP sensor selection only changes the kPa load Y-axis, but not the Base Fuel Table lb/hr
    values (creating an excessively lean map) or the Base Timing Table degree values (excessively advanced timing map).
    You must choose a 2,3,5 bar base calibration or reconfigure your existing Global Folder's Fuel & Timing Tables accordingly.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5

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    Hey, just looked at an Excel spreadsheet, and I'm not sure how to interpret that into the Holley HP EFI? I'm not sure what to set the Injector Off Time to?

  6. #6
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    Quote Originally Posted by 1320king View Post
    I'm not sure what to set the Injector Off Time to?
    I would contact Holley Tech, and see if they have the Injector Off Time curve for GM LS3 fuel injectors.
    I don't want to risk giving you the wrong injector data based on someone's Excel spreadsheet off the internet.

    UPDATE: Open the "Help" Contents (top Toolbar), and click on "Injector Flow Data".
    The Injector Off Time Curves are listed for most GM LSx part number fuel injectors.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  7. #7
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    Here's some LS3 data:
    GM uses a pressure delta value, so it's a big table instead of just one line of voltage (different off time based on pressure & voltage).
    But I've found that I can average the pressure delta values and it works just fine in the Holley.

    Minimum Injector Pulse is .797 ms.
    4V - 14 ms
    5V - 14 ms
    6V - 7.2578125 ms
    7V - 2.8828125 ms
    8V - 2.09375 ms
    9V - 1.6328125 ms
    10V - 1.3203125 ms
    11V - 1.125 ms
    12V - 0.96875 ms
    13V - 0.8359375 ms
    14V - 0.7265625 ms
    15V - 0.640625 ms
    16V - 0.5625 ms
    17V - 0.484375 ms
    18V - 0.4140625 ms
    19V - 0.3671875 ms
    20V - 0.328125 ms

    Or, you can use just the row based on your base fuel pressure (or closest one to it):



    Heres GM's Injector Flow Rating table as well.(also based on pressure):



    Also, from the GM ECU Files. It looks like the end of injection target ranges from 623° in the 4 stroke process to 716°.
    Which would be approximately +83° to +180° in the Holley settings.
    GM Likes to spray on the back of a Closed Valve for Emissions reasons.
    But you will find more power by bring that value backwards, and spraying fuel into the cylinder while the Valve is open.

    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

  8. #8

    Default

    WOW, that's a lot of info to take in. Thank you for that. I'm going to have to learn A LOT more to understand
    what you said fully though, ha ha ha. First time tuning with Holley EFI or anything for that matter.


    I see Holley EFI has the voltage cells as:
    8.0
    8.8
    9.6
    10.4
    11.2
    12.0
    12.8
    13.6
    14.4
    15.2
    16.0
    16.8
    17.6
    18.4
    19.2
    20.0
    Should I just average the voltage into them?

  9. #9
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    Quote Originally Posted by 1320king View Post
    Should I just average the voltage into them?
    That's how I've done it in the past. It doesn't have to be exactly right.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  10. #10
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    It's always better to go with a slightly higher value than what you think the average should be.
    The data basically tells the ECU what the shortest time it can use to fire the injector.
    So if you go too short, it won't fire...but if you go too long, it still fires with no issues, and it just goes a hair on the rich side.
    -Scott
    Don't forget to check out progress on my Race Car:
    Project Blasphemy - 8.07 @ 171
    Low 8 Second Street Car

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