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Hi, this what is the reply from the UK forum.... That's an interesting question. The other way around certainly works but I'm not aware of anyone putting a more recent ECU in an older car. Of course most people do it the other way around because the old ECUs have fewer restrictions (emissions etc) and are far more easily remapped.
about '95 onwards are 16bit, pre that are 8bit. However, the ECU is a self contained device with the same inputs no matter which model, so I reckon either will work. You can't (easily) remap the 16bit ones though, so we have replaced two or three of the 16bit ECUs with remapped 8bit ones. Incidentally, people have said that even a base model 8bit is better performance than the 16bit one.
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