Any more than 36 psi is getting outside it's truly usable range. It'll make more than that, but you're way outside it's efficiency range on the compressor map. You really need to look at the compressor map and figure out your pressure ratio. That will give you 2 things....it'll let you know approx how many RPM's the turbo is really turning (which is likely 100k - 130k RPM's) and it'll let you know where you need to be running the turbo to stay in the safe area of the map.

Here's a good link on Garrett's site when it comes to reading and understanding compressor maps and doing the math....

http://www.turbobygarrett.com/turbob...bo_tech_expert

ANY time you run a journal bearing turbo north of 30 psi, it really should have AT LEAST a 6 pad thrust bearing it, which is usually a 270* degree bearing. Ideally, you want a 360 thrust bearing when the pressures get that high. All that boost pressure is pushing the entire rotating assembly backwards against that bearing and the greater the surface area and coverage of the bearing, the longer the turbo will live.

At 46 psi, your turbo is on borrowed time.