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You Start Get a 944 EPROM, a 1982 to 1985.0 " stock chip" and/ or " performance chip". Don't start until you have one. |
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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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| 1. Take the back cover off the BMW -027 ECU. Unscrew the 4 logic board fasteners | 2. Cut the 20 wires between boards: Repeat for Porsche -015 DME. Leave them as long as possible. | 3. Splice BMW logic board (with the chip socket) to Porsche power board: Some BMWs can have slightly different wire type. | |
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4. Replace the BMW chip with a stock 944 chip (1982 to 1985.0 version). Use the stock 944 chip for initial testing. 5. Fasten Logic board back in place and replace the cover. Test it. Done!
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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 US early 944 DME 0261200015 with a blown power transistor. It is impossible to find spare parts. I planned to cannibalize a similar BMW 325e ECU. I noticed how similar the digital boards were. After doing a side by side comparison for several hours, they were 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 0261200027 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 944 dme and would never convert to the late DME. The late DME does not perform as well and is so unreliable, very cheaply built. BOSCH part number 0261200027 [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. About 2 feet of 1/8" heat shrink tubing. Cut the tubing in longer sections than shown on the example above. 3. A new EPROM for the 944. Either a stock chip and/or a 944 performance chip (like mine!). Don't start until you have one. Use the stock chip to test it. 4. Have all the above parts in your possession before starting work. 5. Contact me if you need a stock chip made 6. This procedure works equally well for Euro/ROW Porsche 944 that use a 0261200006 or 0261200016 chip. This procedure requires no special skills. It is an inexpensive alternative to adding my adapter board. |
| Caution Your Porsche 944 is a 4 cylinder car. The BMW 325e has 6 cylinders! Do not try to use a 325e BMW dme in a 944. We are only interested in one board from it, not the whole dme. Do not try to use the chip out of 325e BMW dme in a modified 944 dme. You will need a Porsche 944 chip. |
