chango- with the portfueler, the stock injectors are "clamped" at a certain psi (stop spraying more fuel, just a constant amount) and the 2ndary injectors (portfueler inj.) start spraying at 15psi...
hahn calls for the map to be clamped at 3.96 volts.. which is equivalent to ~12.9psi of boost (if i remember correctly).... the portfueler reads vacuum/boost and rpm.... once it sees 15.0psi and above, the injectors start sptting fuel based on the psi and rpm....
hope that explains your ?..
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