Fuel Pressure Regulator, PSI setting ????? Options

[3TST]

OK, I'm in the process of installing my aftermarket fuel pressure regulator.
Installation seems pretty straight forward.
However, when I come to set it what PSI can I go to?
The manual states between 38-44 PSI as standard.
Can I increase the PSI over 44, if so to what PSI?

Also, what PSI can the standard Fuel Pump cope with?

Any help would be greatly appreciated.

BTW: I have a '97 ST with standard injectors, an Injen IS2040 intake, Denso Idridium spark plugs and Magnecor KV85 spark plug wires.

[3TST]

This is where I would start ...
First of all, you can get what I call "bolt-on" no tuning parts,
that is, parts you can bolt on without having to tune them.

I'd start with an Air Intake either RAM or Cold Air.
Next I'd get decent set of irdium plugs (Denso, NGK, ...).
Next a set of leads (Magnecor, Nology, ...).
Then you get an AFPR. Adjust/set it to the factory PSI settings (38-44PSI) to start with. Adjust the PSI up or down depending upon the color of your plugs - they should be a light brown/tan color if the engines running correctly.
I would then go for an exhaust.
Just with these items you'll notice the difference in acceleration.

Later on you can get an ignition module (+ trigger adapter) and coil - there expensive c$250-300.

Thereafter, you start getting into the Tuning parts.
The S-AFC falls into this category. (Having said that you can fit one without tuning it, which is what I have done).
The S-AFC connects/wires up to the ECU and is used to convert/override the settings sent by the sensors of the engine in order to optimize the Air Fuel ratio dependent upon what you have fitted (intake, AFPR, ...).
This will need to be done by a shop with a dyno facility.

Bear in mind that once you have it dynoed the majority of items you add afterwards will mean that you will have to have the S-AFC re-dynoed.

I suggest getting all your parts, fitting them all and then get the S-AFC dynoed.
(That's what I'm doing).

Bit of a long reply but I hope it helps.