I have heard connecting vacuum from the charge carrier to the fuel pressure regulator and doing some adjustment to the metering unit will increase the capacity of the KE-Jetronic. Is the adjusment done to the electro-magnetic pressure actuator that sits on the side of he metering unit? There is a small screw on the back and. My guess that this screw adjusts the base pressure that the fuel ecu does adjustments to when on full open throttle etc. Of course all adjustments must be done with a wide band lambda to analyse the mixture.