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Thread: '7747 Flash Chip Conversion (27SF512)

  1. #1
    Super Moderator dave w's Avatar
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    '7747 Flash Chip Conversion (27SF512)

    I'm going to skip over a mountain of details about using a 27SF512 Flash Chip in a '7747 ECM. I'm only going to focus on the actual hardware conversion. Soldering is required! The zif socket is a low profile design and allows the chip and zif socket to fit under the access cover. The zero insertion force chip holder ( aka ZIF Socket ) is available form Mouser for about $10. http://www.mouser.com/Search/ProductDet ... -28-526-10

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    EFI GearHead ! EagleMark's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    That's way cheaper than the adapter from Moates! I'll have to get a few of them.

    Tried burning the old chips again this weekend. Got one out of three, still consistent!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
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    Super Moderator dave w's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    Quote Originally Posted by EagleMark
    That's way cheaper than the adapter from Moates!
    If you add the cost of a ZIF Socket, Moates Burn2, and one 27SF512 chip, the cost is about $100 to do chips yourself. The software TurnerPro is freeware. I can't think of a less expensive route for doing your own '7747 chip? This is of course figuring the solder iron is already in the tool box.

    dave w

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    EFI GearHead ! EagleMark's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    What about a cable for datalog?

    Using one of Moates Dip socket first would let the ZIF socket hang free where the wire is soldered on. Cleaner install for only $2. Should still fit under the hood!

    When I use the Moates adapter I do not use the DIP socket first. Just solder in the adapter. Then the chip clears the hood.

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

  5. #5
    Super Moderator dave w's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    Quote Originally Posted by EagleMark
    What about a cable for datalog?

    Using one of Moates Dip socket first would let the ZIF socket hang free where the wire is soldered on. Cleaner install for only $2. Should still fit under the hood!

    When I use the Moates adapter I do not use the DIP socket first. Just solder in the adapter. Then the chip clears the hood.
    I've used the Moates adapter and a DIP socket, which has a clearance problem. Soldering the Moates adapter directly to the board corrects the clearance problem. The modified ZIF allows for easy chip swapping.

    dave w
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    Re: '7747 Flash Chip Conversion (27SF512)

    If you are really on a budget and do not want to mod your 7747 you can take a 27SF512 and solder a wire on it like you did with the adapter. Modify the stock socket slightly and pop the 27SF512 right on there.
    Does not make for easy chip swapping but its the ultra low budget method.

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    Re: '7747 Flash Chip Conversion (27SF512)

    Dave, im about to do this in a couple days. Any tips for me before i do it? What did you use for material at the point where you soldered the legs together?

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    Super Moderator dave w's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    Quote Originally Posted by y5mgisi
    Any tips for me before i do it? What did you use for material at the point where you soldered the legs together?
    I like using leaded solder. The ECM has leaded solder also. I use a fine tip soldering iron.

    I used some 22 ~ 24 AWG solid copper wire that is "tin" plated I found in a dumpers a few years ago.

    dave w

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    EFI GearHead ! EagleMark's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    I've never had any trouble with 60/40 rosin core.. is this just the wrong solder for ECMs?

    I also use it for soldered wiring connections when I rework a stock harness...

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

  10. #10
    EFI GearHead ! EagleMark's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    Quote Originally Posted by y5mgisi
    Dave, im about to do this in a couple days. Any tips for me before i do it? What did you use for material at the point where you soldered the legs together?
    But when you remove the old stuff from ECM board get a good solder sucker, about $10 at Radio shack.

    Some guys say you have to scrape off clear coating on board but I have always just heated one prong at a time then pulled them out. Now heat up each hole again and solder sucked them down one side then the other. If you get good at it the new dip or ? will drop right in. Sometimes theres a cpuple that are a problem and when your socket is in most clear holes you just heat the problem ons and it falls in. Then a touch of solder on each prong.

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

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    Re: '7747 Flash Chip Conversion (27SF512)

    Thanks for the help there dudes! I think im going to try installing the zif socket tonight. But you guys already know that cause your both on ck5! lol! Anyway, when im all done, if its cool, i'll post my pics up of the conversion also so that there is just more material out there for dudes like myself that need all the guidance they can get when they are just starting out and are nervous about the whole deal.

  12. #12
    EFI GearHead ! EagleMark's Avatar
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    Re: '7747 Flash Chip Conversion (27SF512)

    That's why we started this site. Needed a place to put our stuff. Ideas and helping each other. Look at the FAQ top of the GM section for a ton of useful writeups and links. There's a thread in there about what you were talking about on CK5 and offsets. The photo gallerey has 600 DEF files, hundreds of bins and hundreds of wiring diagrams.

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

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    Fuel Injected! 1leg's Avatar
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    Can someone explain why you need to solder these pin together? I want to install a ZIF just like above. If i use a DIP do i still need to solder the pins. I have looked at the G2 and it does not look like the pins are connected.
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    Last edited by 1leg; 02-11-2012 at 09:23 PM.
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  14. #14
    EFI GearHead ! EagleMark's Avatar
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    This is a go around the G2. No need to do this with G2.

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

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    Fuel Injected! JeepsAndGuns's Avatar
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    (If I have this correct) Its basicly a way to make the 28 pins chip behave like a 24 pin chip.
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