Hello again,

I found this on the web........Richard Sexton

The turbo itelf creates in excess of 2 bar (30 psi); to limit this to the 1 bar the car needs, a wastegate vents excess pressure to the atmoshphere. Factory spec is 0.9 to 1.0 bar, (about 15 psi) but they never came that way from the factory, most are in the 0.5 - 0.6 (about 7 psi) bar range. Calibrating this to factory spec makes a phenominal diference in performance.

Brian