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I don't know about electric cars, but for gas powered cars there are open source ECUs [0][1]. There are also tuners that directly modify the car's firmware to improve performance. Finally, you can connect a computer to the CAN bus [2], which allows you to capture and replay commands, as well as craft your own commands. This is how Comma's openpilot [3] works: it connects to the CAN bus and sends commands for all supported functionality.

What kind of features did you have in mind?

[0] https://en.wikipedia.org/wiki/Engine_control_unit

[1] https://rusefi.com/

[2] https://en.wikipedia.org/wiki/CAN_bus

[3] https://comma.ai/openpilot



There's also the Megasquirt for fuel timing, which is not quite open but not fully closed off either...


For full open source, there's Speeduino and FOME (newer). I've used both for my cars. https://speeduino.com/home/ https://wiki.fome.tech/




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