Editing Z31/turboswap (section)

== Fuel System and ECU ==

''''''''Warning No not try to run a turbo on a Non turbo fuel system as the Fuel maps and injector sizing are configured way too lean for a turbocharged application''''''''

First thing you need to do is to relive fuel pressure from the fuel system. easiest way is to disconnect the connector under the hatch carpet to the fuel pump and then crank the car until it does not fire.

You can now remove the full air Intake from your Z from the MAF (Mass Air Flow) Sensor to the lower intake manifold. This includes the upper intake plenum and throttle body. Make sure you are careful when removing the upper plenum as there are two coolant lines that attach from the lower intake to the upper plenum. One on the Right (US Passenger) side near the rear of the intake and the other to the throttle body.

Being careful, disconnect all the wiring harnesses from the different sensors on the plenum (IAC, EGR solenoid, TPS, AAC, etc). Mark and label the connectors and vacuum lines as you go.

You will likely need to remove the EGR valve from the intake plenum as it is likely the EGR tube will be frozen and not want to budge. Heating it may help break it free if you do plan on disconnecting the tube from the EGR valve or exhaust manifold.

The upper plenum is held to the lower manifold by 5 hex head bolts under the plenum cover.

Once you have the upper plenum out of the way you can see the fuel injectors. Before doing anything take some rags or tape and fill or cover the intake manifold openings to protect it from collecting anything. Now you can Unclip the fuel injector clips with a pick and pull the connectors off each injector. **Note: Now would be a good time to [[Z31/Rewirefuelinjectors php|rewire the injector harness to factory specs]] as you will notice the injectors all piggy back off one lead per side.

https://dev.z31library.com/xenonzcar_archive/z31/images/Turbo%20sw/injectorsmanifold.jpg

Now that the wiring is out of the way you can remove the Fuel lines from the fuel rail and the FPR Fuel Pressure Regulator and unbolt the two 10mm bolts that hold the regulator onto the lower intake manifold. With this disconnected you can remove the phillips screws that hold the injector hold downs to the manifold and carefully lift the whole rail off the lower intake manifold.

Installation of the turbo injectors are the reverse of removal.

Since you upgraded the injectors to turbo 260cc units you now need to swap the ECU out as well so the fuel injectors and fuel maps match. This is easily done just by swapping the ECU behind right (US Passenger) side kick panel. It is held in by a few 10mm bolts. Remove the bolts and disconnect the connectors. Installation of the Turbo ECU is reverse of removal.