my car runs on pizza

So I have 98 d16y8 and wanted to know how much boost can I run on a dyno tuned aem ems I hear 8 psi on untuned I don't have this set up yet but that's what I'm going with I'm going to run it on 8psi on low rpm to get I tuned so safely what can I run And I heard u can't run vtech plz help