m51

I would like to say Hello to all members and tell a bit about myself. So I drive E39 525TD with TDS injectors and Ecu. Chiptune, 1.8 Bar so about 150KW (hadn't tested it on the dino, but will do soon). I'm looking to get more information on M51 tuning.

Ideally need to know abit more about tuning the original pump, I ha e fitted the gt2556v turbo I also used a td5 wastegate actuator to recognise positive boost pressure. Problem is I get huge flat spot when boost comes in. Unless I use every mod. All good and well but you can only do blasts with...