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ever green's screen capture looks very much like OpenEcu.org/Tactrix stuff. They've got software and an OBDII connector/dongle that's capable to reflash most Mitsu's and Subaru's ECU. So it's pretty limited at the moment to those marques.
A few years ago VDO/Siemens would advertise the specs for their ECUs and you could actually find out how fast they work. A better ECU or Microcontroller would then be one that has a faster scan rate. Better scan rates would enable usage of faster sensors like Bosch Motorsports Piezo MAP sensors which would run at 0.2ms instead of the Bosch's standard OEM stuff of 1ms response time. Again it doesn't mean a thing if your ECUs don't run as fast or have big enough look up tables.
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