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When did ECU change from 8 to 16 bit?

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I think this is around '95, but not at all certain. Not much information around about the later models, probably becasue they were not made available to this country.

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    The Manual ECU is a 8 bits

    The AUTO ECU is a 16 bits

     

    I think it's valid for all years (but I can be wrong...)

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    Sure that can't be right because the auto chip can be used in a manual but not vice versa. Also, I have a 1992 auto and it has an 8 bit ECU.

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    I know the 16 bit ECU has a daughterboard for the EPROM and was used in later Z's but not sure when from.

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