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Thread: Subaru nsi isolation module

  1. #1

    Join Date
    Aug 2018

    Subaru nsi isolation module

    I need an isolation module for the NSI dual ignition system on my EA-81. NSI part number was 101-17200-00. Two are used between the 8 wires from the 4 coils (each feed 2 plugs) and the 4 plugs. I'm told the same module was used on the EJ-22 and 25. It's full of diodes which I can't identify. Anybody know how to size diodes to block reverse plug voltage and current?

  2. #2

    Join Date
    Oct 2018
    I have the EJ22 and had the same problem. those isolation modules are very problematic. It's more a question of when they are going to fail than If they are going to fail. There was a fella at KPOV that was manufacturing these but he died several years ago and I am not aware of anyone that has picked up the business. My view is that all the components in the NSI dual ignition system introduce more points of failure than a good single ignition system. When my isolation modules failed, I replaced the whole system with a single ignition unit from SDS. I've been flying it for 10 years without a single issue

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