I had a pre gtx series 35r with 0.82 rear. If you tweaked the waste gate setup you could have 20psi at 3500. Traction was non existent below 100km/h, for Street use it was too laggy to be quick and too fast to be usable without potential jail time. You would start seeing positive boost (a few psi) at 2500 with a bit of load. Guilt-toy had a similar setup and should be documented fairly well on sau. This is my dyno sheet, 26 psi and the dip at 145 was spark breaking down, done on a 33c day.