ok so now the long story!
probably like everyone, i've always wanted to do proper boost control with the delco, but sadly it just doesnt have the coding to do so.
So totally un-related to this, when building the FX i got myself a vacuum pump from a Holden, and plumbed that into my brake booster, all worked well except the pump running constantly got hot pretty quickly, so i decided to make a small circuit with an arduino, map sensor and relay control to basically read the map value on the brake booster, and once it dropped to a certain level it would turn the relay on, and then once it got back to high vacuum turn it off.
before i actually made the board, i started thinking of what else it could do, it quickly became obvious, with the right additions it could easily be a boost controller, so i added an on board map sensor, an external MAT & MAP input and a dual channel high current driver which can run an injector / boost solenoid etc. (all circuits courtesy of speeduino schematics)
It worked really well for the brake booster control, and then i got to thinking if you could read the delco flex table output into an arduino then you could do what you need for boost control.
it required a few hardware mods to make it work, but otherwise all good.
with a bit of help from Jayme we got a working input into the arduino, and i tapped into my 3 bar map sensor that the delco uses, and then i was pretty much set for coding it up. I found a PID controller arduino library, and that was pretty much all i needed to make it all work.
So i changed the calculation in the flex table to display 0-30 (PSI) instead of the 0-100% duty cycle it shows, and then basically put in your desired boost, which then sends that value to the arduino.
as per below here you can see the raw map sensor value, calculated map value, flex input raw value, then converted to a desired boost value, and the the PWM out is the value sent to the high current output to control the mac valve.
at this stage that is basically all i have done with it, as i do not have a registered car with delco and turbo to test it with. I am expecting the PID values will need some adjustment but the theory is at least proved.
im happy to work with anyone who is in a position to test this