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From this: No chip socket |
To this: With chip socket |
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It takes only about an hour to do this yourself |
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| Take the BMW -027 cover off the ECU. Unscrew logic board fasteners (below on right). |
Cut the 20 wires between boards: Repeat for Porsche -015 DME | |
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| Splice BMW logic board (chip socket) to Porsche power board: |
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Replace the chip with a stock 944 chip (1982 to 1985.0 version).
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Add a socket and use a performance chip in your early I came up with this 2004. I was repairing a 944 DME with a blown power transistor. Impossible to find spare parts. I planned to cannibalize a similar BMW ECU. I noticed how similar the digital boards were. After doing a side by side comparison for several hours, they looked exact. The only difference being the EPROM. So I cut and spliced the 20 wires connecting the two boards together. It worked flawlessly. All BMW 0 261 200 027 are made with EPROM sockets. They are relatively cheap and easy to find. I like the early 944 DME so much better than the late DME which does not work as well and is so cheaply built.
BOSCH part number 0 261 200 027 used on 84-87 BMW 325e & 528e is the same model (ML1.2) as the Porsche 944. The BMW is a 6 cylinder car so the power board is not compatible. The BMW logic board is identical to the Porsche logic board (socketed version). Only the chip has to be changed. The BMW ECUs are very common and very inexpensive.
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Materials Part List
2. A foot of 1/8" heat shrink tubing. 3. A new EPROM for the 944. Either a stock chip or performance chip (like mine!). Don't start until you have one. 4. Have all the above parts in your possession before starting work. This procedure requires no special skills. It is an inexpensive alternative to the adapter board.
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1. BOSCH part number 0 261 200 027 used
on 84-87 BMW 325e & 528e.