i wouldnt exactly take this as a recommendation, but ive been doing it for a while now
im running 19 psi on pump gas off of a garrett on my totally stock 120k tI 2.2 bottom end in my 86 omni. ported head, glhs stg II computer, afpr and a/f gauge so i know where i am. i always run it into the yellow going into red, 2.5 straight pipe, stock glhs intercooler, a555. i havent had any problems with it and i beat the living SHIT out of it haha.. it sees the full 19psi anywhere i can do it safely pretty much

its not safe, but there is no way in hell im going back to 14 psi
im storing it for the winter and putting a new block and turbo in next spring anyway, so i dont really care if it explodes.. but i never really run into detonation, and im even running 14 degrees of base timing. my car is in great shape mechanically and it feels rock solid. a rod could go at any time, but such is life.. ill just hope for the best and enjoy it while it lasts
my best time so far has been a 14.5 at 100.5 mph with a 2.5 60'
thats spinning through third.. a 12 might be possible on my current setup with tires that could hook