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Is Port Injection more important when boosted?
I had already settled on a set PI to DI table for my tune, but I wanted to make a small change to reduce some excessive fuel trims. I made 2 tunes, one with more PI, and the other with less PI than the original tune. I wanted to try both to see which one would reduce my fuel trims. Turns out they made the engine run very differently.
My theory is that since I am slightly boosted with a Phantom SC, part of the DI charge is getting blown through without getting burned, while the PI charge is actually burning more completely, since it isn't getting blown out.
What I'd like to know is, have any other tuners out there altered their PI/DI tables to keep more charge in the cylinders under boost?
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If I say yes, will that make you think I understand? 
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