Update: purchased Honda-style FPR, mounting flange nearly completed.
Did some more research on the OEM solenoid vacuum lines, ECU pins and control logic. I've always wondered why most (but not all) of the solenoids are OFF at low RPM and ON after the secondary transition. The only exception is the Charge Control solenoid, it is controlled exactly opposite of all the others... ON at low RPM and OFF after the secondary transition. It turns out the vacuum lines for the Charge Control solenoid are plumbed backwards compared to the other solenoids... see diagram below:
I want the ECU to operate the Charge Control Solenoid the same way the others are activated, (off then on) this will allow me to experiment with controlling the sequential switchover point based on a combination of TPS, MAP, RPM or even VSS rather than simply RPM-based control. In order to do that, the vacuum and pressure lines going to the Charge Control solenoid will need to be swapped. The plan is to install the solenoids and vacuum lines as shown below, this should leave room to mount the Prespool and Wastegate solenoids on the bottom row of the solenoid rack (the top-feed fuel rail is going to prevent them from being installed in their original location).
Update 01-31-2009: finished mounting flange, tacked it to fuel rail for test fit. Fits the FPR well but I put it on the wrong side of the fuel rail... turns out the fuel rail mounts aren't symmetrical. Good thing it wasn't fully welded on.
