Boost utilization is always calculated.... but even without the 3BAR boost pressure can hit 15 or more.... The 3BAR itself doesn't change peak boost nor necessarily does the tune mod for it... it does allow the engine to use it if it happens because the 3BAR is capable of sensing above the 2BAR and the tune mod allows the ECU to recognize and utilize the boost above the 14.5ish limit of the 2BAR... someone posted a video earlier today of their boost gauge during hard acceleration showing sustained boost of 15psi (sorry, forgot where it is)... hope this helpsexplorergotoluvit said:so is the boost with the v8 and 3 bar running about 15 psi then? does anyone know what psi is with out the v8 3 bar tune?