My Bosch pump is set at 1.25 turns IN of the max fuel screw and 2.5 turns OUT of the boost compensator. Boosting 18psi. Any more and the charge temps soon get up and it gets sluggish. They come with a Garret T2, a KKK turbo and Im sure the later ones are something like a T15 for improved response. Check to make sure its boosting properly as standard first 13psi.