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TRA
Dammit
That's a good point. Reminds me:
The engine project for my 996 means that we have to go to a standalone ECU in order to be able to run alpha-N (basically throttle position) based maps, rather than MAF (Mass Air Flow sensor) based. But! I want to keep cruise control - so time to investigate.
My car is so early in the computer-ification of everything that the engine ECU runs the engine, the instrument cluster itself runs the instruments, and the cruise control? That's a standalone box that (I shit you not) pulls the accelerator pedal down with a cable/releases some cable to maintain a steady speed.
Which is actually good news - the cruise (as long as it continues to get a speed signal, which is fine) does not give two shits what's actually running the engine - could be carbs and a distributor for all it cares.
My E63, on the other hand, has five engine maps available from a rotary controller which can also be programmed to change the traction control, the stability control and the damper performance to any combination that the driver (or passenger) wants. And launch control. And it'll park itself. So very much to go wrong/be totally borked when you can't get the right ECU in 10 years.