The last thing to do is to connect the vacuum lines....and there are a few
of them.
There are several lines that need to be run from the manifold; one for the FMU, one for
the boost gauge, and one for the BOV. In addition, another line needs to be run for
the wastegate and if you plan on a boost controller, there will be more still.
To connect the FMU, BOV, and boost gauge, I originally used a double vacuum TEE. The boost gauge and FMU were connected to it and I then placed a single TEE inline with the boost gauge to run to the BOV. I have since swapped that out for a triple vacuum TEE (above) to run the lines neater and to not have any splices. The diagram shows this setup. The TEE is placed inline with the vacuum hose between the manifold (front/right intake runner) and where it connects to the Fuel Pressure Regulator Control Valve Solenoids.
I do plan to make one more change in which I will use a triple gang valve to replace the triple TEE connection I now have. The gang valve will allow adjustment of the reference pressure to the units receiving it. This is only important for the FMU which is increasing fuel pressure to 85psi at 6psi of boost and 90psi at 9psi of boost. These numbers are little high for the injectors and I plan to bring them down to 75psi or so.
I can't leave without showing you a photo of the boost gauge mounted on the
A-pillar, because it's something you rarely see in a 2G PGT. I removed the Cyberdyne fuel pressure gauge to make room for the boost gauge and
have yet to reinstall it. I am unsure if I should put a single pod over the double
so all gauges are on the A-pillar or if I should relocate it down to the center console
next to the turbo timer.
The wastegate connection is very simple. I have a Turbonetics dual
port integral wastegate and without a boost controller, a line simply needs to be run from
the compressor outlet to the compressor side of the wastegate. The wastegate has a
spring that is set to open at 6psi so if reference on the opposite port is atmospheric,
the line from the compressor will thus open the wastegate to maintain no more than 6psi.
For more detailed information on the dual port wastegate, how it works, and how to control boost with it, please see the Boost Controller page.