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Old 02-09-2024, 11:11 AM
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Join Date: Feb 2024
Location: Saskatchewan
Posts: 123
Tapping into EDS harness on 1993 300D to control turbo

Hi everyone! Just bought a 300D a couple weeks ago and have been going through it while it sits on blocks waiting for the driveshaft support bearing to arrive from the USA.


As we all know the EGR has to go, the manifold is filthy. I want to try something different from the standard actuator swap though.


I do electronic controls and have been measuring the signals that the EDS manages, and everything is there to control the turbo electronically without needing to override it with a mechanical actuator. All I need is a microprocessor (Thinking ESP32 with BLE for readout) and a couple MOSFETS. Benefits should include:


- no need to pull the turbo or order specific parts
- EDS can supply clean power, idle control, tachometer

- easy adjustment and measurement of boost
- can run boost curve instead of fixed pressure for lower EGT
- boost can be set to track MAP instead of gauge pressure for high altitude
- air flapper can be used for overboost or runaway safety
- optional output for water/propane injection that can track boost pressure


So the question - because the plug appears to be stuck pretty good in the stupid EDS module and I don't want to trash it in the cold


The manual shows there is a jumper available to tap into this cable for troubleshooting. Are the plug ends available somewhere to make something myself, or can the factory plug end be disassembled to access the pins from the back?


I would like to do something aesthetically pleasing rather than run a razor knife down the harness cable and start splicing and taping.
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