I’ve explained in other articles the benefits to measuring fuel pressure; firstly it allows you to monitor the health of your fuel system but more importantly it allows the ECU to know the fuel pressure seen by the injectors, and therefore how long the injection pulse needs to be to deliver a given volume of fuel. So we highly recommend adding a fuel pressure sensor when installing an ECU.
Most modified RX7s tend to convert to at least the secondary injectors to top-feed style to increase the flow. Because the factory fuel pressure regulator is mounted on the secondary rail, this means that normally an aftermarket fuel pressure regulator is added.
The alternate method is to wire the fuel pressure sensor into the factory MAP sensor wires, and use the internal MAP sensor in the ECU to measure manifold pressure. If you do this, you’ll need to select the (d) source for the fuel pressure as coming from the external IMAP (intake manifold absolute pressure) input.
change the source and sensor type go to (a)” Input” tab in Home Ribbon, then (b) select “Fuel Pressure Sensor”.
You’ll also need to (c) select the sensor type – 0 – 150 PSI gauge being the most common, and once you’re satisfied it’s reading correctly, Select the fuel pressure as being “measured” as opposed to “nominal” in the software, and the ECU will automatically take the fuel pressure into account when calculating the injector pulsewidth.
change fuel pressure modeling, go to (a) “Output” tab in Home Ribbon, then (b) select “Fuel System”
Thank you and happy learning!