hello
I have a reverence question in relation to turbo GTB1756VK Garrett which is safe bost 1.75 bar to 3500 rmp and 1.7 bar to 4000 rmp is ok. Maybe somebody has mape of the one turbo

Mostly depends on what engine size you will use it. On 4,0 1,0bar max, on 2,0 engine 2,0-2,1bar.