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Why S-AFC II's Don't Work on 420A's
In a nutshell, the S-AFC works by modifying the stock MAP signal. As you know, since our cars are naturally aspirated from the factory, our MAP sensors only operate in the vacuum range. Hence, the S-AFC can make changes to the fuel curve under vaccum, but while in boost, it's relatively useless since the fuel curve is now being modifyied by other means (FMU, S-FMU, MS, etc.).
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-Paul
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