My "one trip" statement is based on that was the only trip I took on that setup going on roads where I wasn't going 80-85 mph. The same setup went 12.8 at 110mph in the quarter mile so I'm pretty sure it was running well.
Quick question. You state you have the hose off on your FPR. Does the z31 not use a vacuum/boost source to raise/lower the fuel pressure in accordance with pressure?