Formerly: DetonationEMS
OpenLogicEFI ECU's are based off an open source project called Speeduino by Josh Stewart. Currently all released boards use official Speeduino firmware. In TunerStudio set to "Board Layout" to "Speeduino 0.4"
All designs are released under the TAPR Open Hardware License v1.0
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The Official Speeduino Manual, documents and discord are the best places to start.