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Can fuel pressure be raised (permanently) on our returnless system? All u would have to do is change/modify the intank regulator, right?
What would be a safe increase?
Using the equations from RC Engineering's site, a 240cc injector could flow 310cc's if fuel pressure was raised form 45psi to ~75psi, but it's probably not a good idea to run that kind of pressure all the time. Would it kill the injectors?

 
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fuel pressure can only be raised when there is an adjustable fuel pressure regulator in the fuel system. Unfortunetly there is no adjustable fuel pressure regulator available that works on a returnless setup. This is the reason why so many have switched to a return style fuel system.

75 psi seems really high to be running all the time. my fuel system is based at 43 psi but adds 1 psi of fuel for every psi of boost. (boost referencing fpr) so at most i should see 51 psi of fuel while under 8 lbs of boost.

why not go with some RSX-S injectors which are 310cc. These are popular for boosted d17s including mine.

 
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Yea, I probably will.
I was just looking at the install/remove diagrams from the Helms manual and thought this might be a cheap mod.

 
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Here's some pics

 
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yeah i know that all too well. i've been in and out that tank more than i can count on my hands.. the only thing you can do there is upgrade the fuel pump.. theres really no room for anything else, especially adding more stuff.