vtec sends 12volts at 1amp for the solenoid, as where iab is a simple ground in the ecu, so the iab wire should be connected to a relay, the relay has key on 12v to it and the ecu will ground the relay turning it on and thus connecting the needed 12v to the 12-16valve solenoid. I achieve 42mpg on a good tank with ac, 9psi boost to redline here and there, plus 65-75 mph on highway.
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