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Thread: Chip Install, How To?

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  1. #1
    Join Date
    Sep 2004
    Posts
    117

    Default Chip Install, How To?

    So I bought a chip to enhance the performance of my 525i. I know it goes in the ECU, but how do you open that damn box? Do I need a special tool? It also looks as though I need to pry some tabs? Is this right?

  2. #2
    Join Date
    Nov 2004
    Location
    Canada
    Posts
    13

    Default

    Here is a good site with Chip install and lot of E34 repair tips.
    BTW: EAT Chips are the best!



    Quote Originally Posted by all2kool
    So I bought a chip to enhance the performance of my 525i. I know it goes in the ECU, but how do you open that damn box? Do I need a special tool? It also looks as though I need to pry some tabs? Is this right?
    91' E34 535i 5-speed LSD,ASC, E.A.T. enhanced

  3. #3
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
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    14,755

    Default

    you have to bust the **** outta the tabs (they will break anyways so save some bad feelings) take the case off the top, insert a screwdriver on the side on the plug deal and another on the other side and squeeze then till you can pull the board back. You probably wont be able to cause the fisrt couple times you do this is sucks. Anyways you pull the board up in the back and pull it back outta the plug and then go in and replace the chip. NOTE: MAKE SURE YOU REFERENCE the tab, notch, dot or whatever cause in you put it in backwards it isnt a good thing!.

    Hope this in some way helps.

    Brunos site tells the same thing but this is my take on things.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    Jan 2004
    Posts
    1,235

    Default Probably easier for the 6-cylinder than 8

    IIRC - the 8 cyl has the 2-board ECU, which can be a PITA to work with.

    The M30 ECU box is made of aluminum, and the tabs can be gently prised apart then bent back into shape almost like new. Yours may be like that (if you're lucky!)

    I think the earlier ECU is easier to dig into than the later ones perhaps. Mine was a piece of cake. Just be sure to unplug the battery or your airbag light will stay on.

    - Robin
    Last edited by Robin-535im; 11-12-2004 at 08:08 PM.
    Robin

    72 Chevy K10
    01 E39 M5

  5. #5
    Join Date
    Dec 2003
    Location
    baton rouge, loserana
    Posts
    6,922

    Default

    all america wants is cold beer warm cat and a place to take a poop with a door on it

  6. #6
    Join Date
    Sep 2004
    Posts
    117

    Default What a PITA!

    What a PITA! No matter how hard I tried, the top board would not come off. Tabs? Broke them off rather early. I did manage to change the chip without separating the boards - and got the chip cover back on. 525 seems peppier now.

  7. #7
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
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    14,755

    Default Yep, my first time I fished it in there...

    after the 4th or 5th time its pretty broken in and I can change a chip in 5 minutes from the time I pop the hood.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  8. #8
    Join Date
    Jan 2004
    Posts
    343

    Default Wow! How did you do that? I spent several hours,

    over two days (really!!) before I finally got the boards separated in my 1991 525i. I did not know there was any way to change the chips without getting the boards apart.

    Quote Originally Posted by all2kool
    What a PITA! No matter how hard I tried, the top board would not come off. Tabs? Broke them off rather early. I did manage to change the chip without separating the boards - and got the chip cover back on. 525 seems peppier now.

  9. #9
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,755

    Default The first time...

    I couldnt get the top board to pull out of the plug, so I just lifted the rearward part of the board up as far as it would go. Then I went in with a tiny screwdriver to lift the old chip up and then fished the new chip in with hemostats (roach clip) and pressed it down carefully. It is much easier after you break all the clips and it almost falls apart.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  10. #10
    Join Date
    Sep 2004
    Posts
    117

    Default

    Thanks guys - I don't feel so bad now knowing that others were unable to separate the boards. Once you spread the boards apart to the max, putting the chip in wasn't really that hard.

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