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well, I did answer your question....
first of all... a piggy back will receive the 02 reading, not your ecu.... the piggy back will trick the ecu into thinking everything is normal... that's the purpose of a piggy back.
second of all.... the ecu reads a fuel vs air value... stoich is 14.7:1.... which is basically PPM of unburned fuel vs. air (which is the job of the o2 sensor).... whether there is 1cfm or 1,000 cfm moving through a space, the sensor will read the same ppm.
your system should read rich because you should be running rich with forced induction...
lean in n/a is good.... lean in FI is bad.....
lastly... if you're in a v6 and it's reading 10.0:1 at one V bank and a downstream is reading 16.0:1, then it should tell you there's a major problem with both banks, and they are somehow out of sync in terms of their AF values. The way that FI works is usually injectors are fired in a batch.... so, for instance in a 4age cylinders 1 and 3 then 2 and 4 fire at the same time..... this is based on firing order, so in a V6 it wouldn't be based on bank, because firing order is never 1, 2, 3, 4...... if it was designed that way it would be the shakiest engine ever....
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