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Thank you both! BimmerAG, yes, I would be very interested in what you find out.
I will add throttle position to my UltraGauge and try to get better sense of how much input is needed to get boost. Wish I had a data logger...
I am still not sure how the ECU can leave the wastegate open if it is operated by a vacuum actuator? Isn't the fundamental principle that of pressure on the intake side overcoming a spring-loaded piston to open a valve on the exhaust side? The spring preload can be adjusted by the ECU, yes, but the ECU cannot simply command the gate open, can it? There is no electric actuator. Isn't pressure (some amount of boost on on the intake side) required to physically operate the vacuum actuator and open the gate?
Thank you again.
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