Originally posted by Panici
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A related point: I'm using a JGS wastegate (JGS400 v-band). Nicely made unit, piston-style actuator rather than diaphragm. The piston area is only slightly larger than wastegate valve area, different than many external gates that have a large-diameter diaphragm. This means the boost level is more sensitive to turbine pressure. This probably explains why my 130kPa (absolute) base boost with 65kPa (gauge) on the dome only gave me about 165kPa MAP (basic idea of dome control, that dome pressure adds to spring pressure, says I should have been at 195kPa MAP in this condition).
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