Keep in mind the over-riding rule here for everything is "if it doesn't say you can, then you cannot".
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Can someone add an Engine Management Computer to a fuel injected car...that didn't have a computer?[/b]
No. The proposed rule states "altered or replaced" not "add".
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...is it acceptable to re-engineer one type of fuel injection (say L jetronic) to a different type modern sequential digital if that upgrade requires installing different type injectors, higher flow injectors, or higher flow or pressure fuel pumps etc?[/b]
Nope. No where in the rules does it allow "different type injectors, higher flow injectors".
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Are any of these non digital devices considered "Engine Management Computers" under the proposed rules?[/b]
An interesting concept.
Old adding machines are "computers", albeit mechanical ones. An abacus is also a "computer." Ergo, barring a clear definition of "computer" to specify electronic versions only, I'd suggest anything that accepts inputs and changes outputs can be construed as a "computer" and thus able to be "altered or replaced".
For example, I know back in "the old days" Showroom Stock racers used to reprofile the metering pin/shaft in the CIS cars in order to improve the fuel mixture. That fuel metering device is decisively a "computer" in the mechanical sense of the word, in that it takes inputs (control pressure via the control pressure regulator, and airflow via the airflow flap) and controls the output of fuel to the injectors. While that was decisively illegal in Showroom Stock, I suggest it may be "legal" under these new rules.
But, though, that's to the strict literal interpretation of the words only, and I personally don't see it as the original intent. If handed to me on a protest, I'd be hard-pressed to reject the idea, though...
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Under the wording of the rule, can I modify the engine head, intake manifold or other supporting hardware in order to create an engine management system different than the original?[/b]
Nope, once again: no specifically allowed, ergo specifically disallowed.
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If I have an air metering device (example Porsche 944 air box or a Rabbit CIS box), under this rule, can I upon adding an engine managment computer with means to control mixture leave these devices in place but disable them in a way that substantially reduces their induction pressure drop?[/b]
You cannot mechanically modify them, but you can reprogram your computer to ignore their inputs.
"If it doesn't say you can..."
Greg