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Have you come across MegaSquirt[1]? The most recent iterations are neither inexpensive nor DIY but the earlier versions are still made as well.

[1] http://www.msextra.com/product-range/traditional-megasquirt/

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Those look pretty good, I'll have to dig in a bit deeper! At first glance, it looks like it might be a bit of a run around getting one to work with MAF and CAS sensors, but pretty much every other ECU wants a MAP sensor anyway so it wouldn't be a bad time to switch.

I had heard of them but I thought they were a Miata specific ECU replacement not a general purpose one.

The Speeduino project is similar but more DIY focused, and newer, and open source. https://speeduino.com/wiki/index.php/Speeduino

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