Engine simulators have always been an important part of setting up and developing an aftermarket ECU. Speeduino has typically used Ardu-stim for this purpose, but this has stagnated somewhat over the last few years.

This is early days on some work I'm doing to rejuvenate that system.

Current Alpha release: https://github.com/speeduino/Ardu-Stim/releases/tag/0.0.3