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

  1. #121
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    Hey Joe, how did you 'mix' them? I've thought of doing a mixed model, but Matlab's way of doing it was just so nice and easy it got me lazy

  2. #122
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    The fact that our interpolation efforts via different tools/methods came very close to each is a sanity check...
    AMEN brother!

  3. #123
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by redhardsupra View Post
    Hey Joe, how did you 'mix' them? I've thought of doing a mixed model, but Matlab's way of doing it was just so nice and easy it got me lazy
    I saw that one interpolation fitted one portion of a curve perfectly, but not the other portion... so I interpolated in segments... I told my tool to interpolate from x1 to x2 using cubic spline, and from x2 to x3 using quadratic, all in increments of 0.0001 or 0.00001 (I got out-of-memory on my 2GB DRAM if I used any smaller increments)... and then I picked the points at the increments for the LS1 tables.

    My tool is DPlot, it lets me operate on a portion of a curve at a time... it also forces me to treat a 3D curve as a series of 2D curves in each of the X and Y axes separately... definitely tedious.

  4. #124
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by redhardsupra View Post
    I think I posted that spreadsheet didn't it?

    The one part that cannot be really done with a spreadsheet (or at least not easily) is the 3d surface fitting for the offset table. I did it in Matlab, if you're interested I'll be glad to share my code for that. I usually don't post that sort of stuff, because people tell me that's useless to them, but I'm more than willing to share with the extra curious ones.
    Hey RHS, I'd be VERY interested in that matlab data. I'll send you a PM, you don't have to post it up publically, but I own matlab and use it occasionally so I'd love to plug it in and see how you're working with it.
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  5. #125
    Lifetime Member Aloicious's Avatar
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    Quote Originally Posted by redhardsupra View Post
    Our large displacement engines need a good chunk of fuel to just keep them running, so even with large injectors, you're on the low-end of fuel flow pretty much only under deep deceleration. Again, you got a perfectly valid point, but don't sweat it too much.
    +1, very rarely do I ever see that low of a commanded pulse width, especially after making corrections to the airflow tables (VE, MAF, etc).
    1996 c1500 gen1e 5.7L - the "LS31", 24x CNP, LS2 coils, modified T56, 12200411PCM running COS3, zz4 cam, custom MPFI, etc. coming soon: Twin Turbos

  6. #126
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    Can someone just put a ls1 tune online with the ls3 data in it so we can download and copy and paste data over? Thanks

  7. #127
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by Jacktuner View Post
    Can someone just put a ls1 tune online with the ls3 data in it so we can download and copy and paste data over? Thanks
    In the spreadsheets, the LS1B paste-able tables are labelled.
    Attached Files Attached Files
    Last edited by joecar; January 25th, 2018 at 03:23 PM.

  8. #128
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    Thank you

  9. #129
    Member Whipped383's Avatar
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    By chance is there any data conversions for the 12613412 injectors? Supposed to be 50lbs and used in the 2010 to 2013 6.0 flex fuel trucks
    97 K1500, 383, 4L60E, Whipple, Stock 14 Bolt with 3.73, EFILive V2, 0411, Marine, #42 Injectors, H-Boost, LC-1, Coming Soon: Intercooler, Trutrac, 4.11 gears?
    03 K2500HD, 8.1 and Allison, Stainless works long tubes, Intake mods

  10. #130
    Joe (Moderator) joecar's Avatar
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    To convert those I would need the stock tune files.

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