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Originally Posted by 19bonestock88
Dual EFIE? I don’t follow...
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Not sure what your asking
Modern cars have 2 o2 sensors a decent EFIE on each allows you to trick the car into thinking you are running rich and lean out.
A decent EFIE is variable and allows you to intercept your o2 sensor signal and set your AFR after you are up to cruising speed.
However a narrow band car looses resolution slightly above 15:1 AFR so you can’t normally get a car to run AFRs much above 15.2:1 with an EFIE
And no I’m not advertising, you can build an EFIE with less than $5 of parts there isn’t much to one.