Chip Install, How To?

[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?

[Gman]

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

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?

[632 Regal]

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.

[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

[winfred]

http://www.bmwe34.net/e34main/upgrade/chip.htm

[Dick Schneiders]

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

[Russell]

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

[MarkD]

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

[Russell]

Interesting how different the E34s are over the years.

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

[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.