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Thread: International 345 TBI EFI conversion

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  1. #1
    RIP EagleMark's Avatar
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    Awhile back when I did this harness I noticed the 4l80E wiring diagram went from VSS to PCM. But the 4L60E went to a DRAC/VSSB buffer so at that time I only had an $OE manual bin and wired that way.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  2. #2
    RIP EagleMark's Avatar
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    Well it has taken longer then expected but my kid wanted to do the entire project himself. With school and a full time job he got er done!

    I was just a teacher and the project is running. Now just have to cover harness in convoluted tubing and proceed to tuning. Which is another thing he wants to learn so TunerPro and ADX and XDF and his starter $OE manual bin are loaded on his laptop.


    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #3
    Fuel Injected! JeepsAndGuns's Avatar
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    Way to go! Keep us updated as the tuning moves along. I'm intrested in seeing how it turns out and compares to how I have mine set up.
    79 Jeep Cherokee, AMC 401, T-18 manual trans, hydroboost, 16197427 MPFI system---the toy

    93 Jeep YJ Wrangler, 4.0L, 5 speed, 8.8 rear, homebrew hub conversion and big brakes, hydroboost, 2.5in OME lift, 31x10.50's---the daily driver

    99 Jeep WJ Grand Cherokee limited, 4.0L, auto, 2wd, leather and power everything, 99% stock---the long distance highway ride.

  4. #4
    RIP EagleMark's Avatar
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    Well so far the tune is stock $OE that you used, except for EGR etc turned off. It started with a turn of the key and idled nicely!

    Only 500% better then with carb, manual choke and points...

    Truck sat all night and kid (Jesse) was so excited he said this morning before he left for work.. "You think it will start again like that?" I said yup, guarentee it, and he just turned the key and it ran better then it ever did warmed up.

    I have a VE table from a 7747 tuned to a stock Scout 345 engine and dave gave me a IH timing table he made but it's pretty aggresive from a lighter scout. His truck is heavier, has a utility bed and he tows with it. Also has an Isky dual grind cam! He also wants to learn to tune so I am going to just tune from that bin and teach him. While we are working on VE I'll get to see how the knock is going to react in this engine, do some of the tricks we talked about, listen by ear and see if we can get it reliable to leave on or get a feel for it while tuning then turn off.

    By then he will need an oil change and we will install the CTS I modified in drian pan for oil temps (wired into trans temp pin) to see if we can find that spark advance zone that does not help, does not cause knock but will raise oil temps!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  5. #5
    Fuel Injected!
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    I made that same adapter for an old scout I used to have except that I used countersunk head allens instead of counter bored. The project never got finished, and got sold to clean up around here unfinished :( I still have a brand new small cap HEI distributor for an IH V8 out in the garage taking up space. Cool that it went that well>>>

  6. #6
    RIP EagleMark's Avatar
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    Took for a data log session and went to use Dave W $OE etc... fixer spreadsheet and it did not work? I have used the 7747 side and it was wonderful... so I looked at BLM history tables in A219_0E_31_v250 and they were not correct to XDF fueling table and Dave's VE fixer spread sheet so I had to rebuild them.

    Took 2 data log rounds of about 15 minutes each to get VE perfect then did spark and found the stock knock sensor works nicely on the IH motor. Got spark dialed in and had to redo VE tables and she's now running like a charm.

    Here's the new $OE.adx with corrected BLM history tables.
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  7. #7
    Super Moderator dave w's Avatar
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    I posted some notes about the histogram here:
    http://www.gearhead-efi.com/Fuel-Inj...7&d=1322137638

    The new.adx file is a good fix.

    dave w

  8. #8
    RIP EagleMark's Avatar
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    Well his last trip towing his Rock Crawler to a compition cost half as much in gas as it did last year!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

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