Hello. I have Audi with AFN 1.9TDI. Some time ago was remaped for 0,21 injectors and VNT17 turbo. Car was fine. Now I change 0,24 nozzles and 1,6bar boost, but car is now slower than before. I changed the pump voltage map a little(low mg - higher voltage and opposite), with this I get lower EGT, but performance is worse than before with 0,21 injectors. I think, there is need to be changed SOI.
My 0,24 injectors is set to 210bar. Could someone help with SOI explanation a little bit?

Hello friend, to see if I can help you. Have you tried first to adjust the fuel transfer pump mechanically ?. This serves to give more flow mechanically to the pump by moving its body. Here I leave a YouTube link.
https://www.youtube.com/watch?v=Te6FCJEqX7w