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Permalink Reply by David J. Beaulieu on November 16, 2021 at 6:58pm

Hi Bob, I happen to have a dual ECU setup with my 350iS.  My ECUs are the old style black boxes.  It certainly makes things a bit more challenging to run the additional cable and wires through the firewall and adds more complexity to your electrical system and swtiches on the panel.  I did have an ECU fault light once while in flight, I believe it was related to a sensor, but once on the ground after recycling the ECU the fault light cleared and never returned. I do have a greater sense of confidence with dual ECUs when I am over remote hostile terrain, but having said that, the new ECUs (red box) are likely even more robust than the originals and appear easier to connect and wire up,  I would likely go with a single ECU if installing another UL engine.  Less money, less complexity.  That's my 2 cents...

Cheers and good luck with your decision!

Dave

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