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Thread: 1992 K2500 5.7L TBI to Vortec Swap

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  1. #1
    Fuel Injected!
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    1992 K2500 5.7L TBI to Vortec Swap

    Hey everyone,
    I have recently swapped over the vortec heads to my tbi engine (plus intake) and came across some issues and concerns. Any help is greatly appreciated.
    I found the bin file for the BRDW(G30) tune but it comes with a 4L60e parameters and I am currently running a 4L80e in my truck. I saw somewhere that I can possibly do a segment swap to enable this bin to work for my setup, but I am not sure how to do that. Will someone be willing to do the segment swap for me or explain the easiest way to do it? Also, since the head swap, I have developed a knock which sounds like a detonation knock because it is very random, is this due to the setup without the tune? Very frustrating after spending so much time doing the swap to hear that loud knock noise lol. I did remove the belt and it is still there, but it is very very random. Any help is greatly appreciated!

    George
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  2. #2
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    Hello, and welcome to the forum.

    A segment swap is used on OBDII calibrations but that that technique is not usually applied to OBDI calibrations due to the way the calibrations are arranged. You should probably use copy and paste to insert the spark and fuel values from BDRW into your calibration.

    Vortec heads typically like less spark advance so if you are still using the swirl port spark tables it's possible they are too far advanced and causing noise. It's not likely but it's possible.

  3. #3
    Fuel Injected!
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    Thanks 1project2many(story of my life btw lol), When I load the BRDW.bin into TunerPro, it comes up with 0 values. When I open the bin in the hex editor, there are a lot of "0" values before it actually starts seeing data. So as removed all of the "0"'s so that the first binary(7E) starts on offset 00 which at that point I was able to see data in TunerPro. I'm not sure if it is correct data, but it's data lol. I apologize for my ignorance, I am very new to this.

  4. #4
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    There's nothing to apologize for. If the file was read from a chip that has greater storage capacity than calibration needs, the beginning of the file is padded (filled) with useless data. Once the padding is removed you can read the file normally.

  5. #5
    Fuel Injected!
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    Thanks! What is throwing me off is that the values for the BRDW in TunerPro show some sort of crazy looking values. For example, Spark Timeout vs Coolant Temp, the numbers look really really high to me. So I'm not sure if this thing is decoding it correctly. Image attachedsparktimingcoolant.PNGsparkadvancebrdw.jpg

  6. #6
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    No, that's definitely not right. There's some garbage found a way into the file you attached.

    Try this one. It's taken from the file which also has source code.

    Edit: This post contains the same BRDW file, with padding, that you are using along with a disassembly of the calibration. If you open the disassembly (ends with .src) in notepad or wordpad you can look at the first few bytes of the original calibration.
    Code:
    L4000  FDB   6395   ; EPROM ID
    					;
    L4002  FDB  $FFFF   ; PLATFORM ID WD 1
    L4004  FDB  $FFFF   ; PLATFORM ID WD 2
    					;
    L4006  FDB  $14CE   ; CHECKSUM
    L4008  FCB  $63     ; EPROM ID BYTE
    This tells you that (1) The actual file starts at $4000, and that (2) the checksum and eprom ID AKA Mask ID byte together are 14CE 63.

    If you open the padded file in a hex editor you can find the same bytes. Look at the attached picture to see the checksum and mask ID circled, the arrow pointing to the cursor placed at the beginning of the original file, and the red circle in the lower left corner showing the address of the beginning of the file as $4000. Cool, eh?
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