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Thread: Chip Install, How To?

  1. #1
    Join Date
    Sep 2004
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    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
    Posts
    14,749

    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
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    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
    Jan 2004
    Posts
    343

    Default Not so, my friend. The M50 also has the 2 board ECU like a sandwich

    Quote Originally Posted by Robin-535im
    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

  7. #7
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
    Posts
    2,561

    Default Mine has a single board. 95 525i

    I put the E.A.T. chip in this summer and I only remember a single board.
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  8. #8
    Join Date
    Dec 2003
    Location
    Toronto, CANADA
    Posts
    882

    Default

    Quote Originally Posted by Russell
    I put the E.A.T. chip in this summer and I only remember a single board.
    The 0 261 200 413 DME which you have is a single board.

    The M60 DME's (404, 484) and the earlier M50 DME's (405, 403, 402) are two boards.

    Mark

  9. #9
    Join Date
    Jan 2004
    Location
    Lexington, Kentucky
    Posts
    2,561

    Default Thanks-This I did not know.

    Interesting how different the E34s are over the years.

    Quote Originally Posted by MarkD
    The 0 261 200 413 DME which you have is a single board.

    The M60 DME's (404, 484) and the earlier M50 DME's (405, 403, 402) are two boards.

    Mark
    Thanks,

    1995 525i Auto, M50TU 2.5L, EAT chip, 1/95 build, USA, 205/65/15 tires, ASC+T, HID, lumbar, EC Mirror, BMW Alpine 5 radio with BMW-Pioneer CD Changer, abt 236k miles, Oxford Green/Parchment

  10. #10
    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.

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