Turbocharger Compressor Diagram K14

Hi,
The KKK K14 turbocharger is used, for example, in the T4 ACV, but also in the Audi AEL (2.5 TDI 140 hp).
The maximum boost pressure in the Audi is approximately 1.0 bar (actual data from MSG with VCDS).
Would the turbo also be able to withstand 1.15 bar on the 2.5l TDI at a maximum of 4,200 rpm?
Or would it overspeed then?
If it works at sea level, what would be the result at 3,000 meters above sea level?

Here is a diagram for the KKK K14:
Http://www.not2fast.com/turbo/maps/k14-2464.jpg

Unfortunately, I can't interpret it.

Further Question:
If one were to configure a new Wastegate turbocharger, there are a few key considerations:
- The size should be determined by the exhaust flow and desired boost pressure
- If one wants the most early and rapid boost pressure build-up, one must design the Wastegate turbocharger as small as possible, correct?
- What are the advantages and disadvantages of ball bearings? (This applies to moderate diesel engines, not gasoline engines, or racing engines)
- What are the advantages and disadvantages of an external and internal Wastegate?

Best regards,
Jens