Now comes the fun part. The tricky fuel pressure regulator connection. Normally this would be a snap to figure out, as on the Z28, but naturally the PGT and its high-tech engine has some extra baggage.... namely the Fuel Pressure Regulator Control Valve.
The NOS kit comes with a
pressure TEE connector. The leg (vertical) part has a BLUE
fitting which contains the by-pass jet which regulates the fuel
pressure. The arms (horizontal) of the TEE get plugged into the
stock fuel pressure regulator on one side and and the NOS fuel
pressure regulator on the other.
The first thing to do is to run the vacuum hose from the NOS regulator around to near the stock fuel pressure regulator (FPR). Then, before making any connections to the pressure TEE, make sure that the .042" (#42) jet is installed in the blue fitting of the TEE.
Connect it to
the pressure TEE as at (2.) (seen at the right and below). Now we must
connect the stock FPR to the TEE. Find the FPR and the vacuum
hose connected to it. Follow that hose over the the Fuel Pressure
Regulator Control Valve (FPRCV--has the little Mitsubishi symbol
on it) and then disconnect it from the FPRCV. Now plug in the
side of the hose that you just disconnected to the left side of
the TEE as at (1.) (seen at the right and below).
Pretty
simple so far, but the big question was where does
the BLUE fitting get plugged into?! Originally,
I thought that it got connected to the now vacant spot on
the FPRCV, but I had my
doubts. I noticed the other vacuum hose at the opposite
side of the FPRCV that ran
directly into the intake manifold and I felt that it was
the correct connection. Apparently I was correct. Eddie Wu was kind
enough to call from California and verify that this is
how his TEE is set up also. So my connection was made by
disconnecting the the vacuum hose from the bottom of the FPRCV and reconnecting it to the
leg of the TEE as at (3.)
above.So, the vacuum hose comes directly from the intake to blue fitting side of the pressure TEE and the FPRCV is by-passed altogether. I did leave the electronics plugged into the FPRCV. I have not had any Check Engine lights and the car runs great, both on and off the bottle.
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Place the .036" (#36) jet in the fan spray nozzle and then connect the 2 foot stainless steel line to the nozzle and the solenoids. Make sure not to turn the nozzle while tightening the braided line on it. The spray side must face the throttle body.
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NOTE: The FPRCV can be left inline in the
setup. This will just cost 1 psi or 2 max and increase
the pressure drop-off rate slightly. This is OK with the
36/42 jettings. To leave the FPRCV connected, connect the
arms of the TEE to the stock FPR and NOS FPR as shown.
Then take the leg and connect it to the top vaccum line
on the FPRCV and leave the bottom line on the FPRCV
connected to the manifold. In essence, the only thing
that changes is where the leg gets connected to.