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depends on the 4age vs 4agze you are talking about.... there are several different plugs.
the gze uses 365's... probably measuered at around 40psi of fuel.
the early bigport uses 212's, 250's in the smallports, and 270's in the 20v's (which are sidefeed).
sometimes you will hear someone getting test results back from their injectors and it's different than factory... that's because some testing facilities use a higher PSI.... an injector works for a specific amount of time that the spintle is open for and allows X amount of fuel through.... that amount of fuel is based upon how much pressure is behind the injectors.
In any event... if you are using a piggy back... then the sole purpose of the 'band aid' computer is to trick the stock ecu into thinking everything is working ok. Meaning, if the piggyback is tuned and expects a certain 02 reading, it will still send back a stoich (or % of what it's reading) measurement to the stock ecu. that's why it's called a piggy back, and why a friend of mine (and I picked up) calls them 'band aid' computers.
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