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Untuned you probably won't want to run much over 3-4 pounds. I mean you technically can probably run around 7 or 8, but you will be running rich as hell and you wont get the power you could be with that kind of boost.
you cant really say one psi or another, it depends on the turbo you use...cfm ya know? if your running the common .57 trim t3/t4 or smaller than yeah 8 psi would be alright some kinda tune but no tune is no good. honda maps (civics) are good past 10psi, dont use a missing link, those are gay.