turbo issue

[pete92]

hi all sorry in advance if this post has already been posted im new

I need some help I got a audi a3 2.0tdi 170 (bmn) its been remapped and dpf delete ive had this about near enough 2 years ago now my turbo kicks in at 3300rpm 2nd gear, 3000rpm 3rd gear, 3000rpm 4th gear and 2500 rpm 5th and 6th
from 1000rpm to 3000rpm I got like a lazy boost but then after full turbo kicks in
one of my friends bypassed the n75 solenoid and the turbo kicked in at 1500rpm but then cut out at 2500rpm he told me its that solenoid so I changed it from euro car parts but nothing happened the turbo was the same

ANY IDEAS PEOPLE iN NEED OF HELP

[ManiacGT]

Off the top of my head... failing turbo, vacuum leak... Perhaps get the car ECU map restored to factory and see if this helps?