The Z32 AFM (from the 300zx range of cars) is 80mm in dia and is rated up to 500Hp. Since I will only be able to get 380 - 450Hp from the CA18 (so I have been told) this AFM unit will be more than suitable.
The cold airbox which will house the pod filter and the boost controller assembly will be completed at a later stage when time allows.
Fuel system Upgrade
Having completed the T28 turbo upgrade, it was quite clear that the factory fuel system was not going to manage the increased volumes. Had the injectors and fuel pump remained stock I would have starved the motor causing detonation and destroying the engine.
Starting from the tank and moving forward I changed the stock in tank fuel pump with an RB25DET in tank pump from the R33 skyline which wires up and fits straight in. The first 2 pumps I tried were both broken which ment the car took a lot longer to get running again.
While waiting for the night to pass so I could return the 2nd burntout pump I decided to change over the fuel injectors. This may not sound like a major problem, especially if you are aware of how injectors are mounted, but on the CA it was a mission and a half.
The new injectors are the 444cc top feed injectors from the GTi-R Pulsar and were a straight swap for the factory 375cc injectors. The difficulty with the change over was not the injectors themselves as both the GTi-R injectors and factory injectors are top feed and have exactly the same dimensions, therefore they fit within the same fuel rail setup. The difficulty came when I tried to unbolt the fuel rail without wanting to remove the inlet manifold or all the piping and brackets which are around the rail, needless to say it took nearly 4 hours to finally finish the change over. I'm sure there will be a faster easier way to change them over and I'm sure if I do it again I will be much faster, but not this time.
The factory fuel pressure regulator has been changed to an adjustable 1:1 ratio Monza unit, it is very easy to use and install with the exception of the new connection required to the end of the fuel rail.
I fitted a fuel pump from a turbo skyline thinking it would have a larger volume, once tuning began it was obvious this was not the case and further investigation showed all turbo nissan's (except the gtr) have the same volume pump. Out went the nissan pump and in went a new Walbro 500hp intank pump with new wiring to ensure no current drop when operating. This made a huge difference, especially when tuning the car at 15psi. The previous pump struggled above 13psi with the larger injectors.