Chip tuned Turbos (no other mods) shouldn't have more than 1.0 bar boost. This isn't healthy at all. I never saw a chip tuned Turbo with 1.2-1.5 bar boost, this would be crazy.

Usually, Tuners don't exceed 1.2 bar to avoid problems with engine reliability. The Turbos I "know", usually have around 540-570 HP and run a max. boost pressure of around 1.1-1.2 bar with modified K16 turbo chargers and/or K24.

Boost pressure isn't always everything.