1u200hp-pd

Hi all I have recently converted my old mk1 Octavia estate from a VE 110hp engine to a PD150 engine with supporting mods and mapping to 205hp the car starts and runs fine but when I try and drive it, it has no boost or comes and goes very sporadic I have the donor car with was running perfect was boosting normally with the popcorn limiter, swapped everything over both looms for the ecu from the left and right of the donor car and obviously the ecu it doesn’t show any fault code but can’t just get it to boost correctly any ideas be greatly appreciated and received.