Originally posted by johne
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AFAIK - the ECU uses the nominal amount of duty cycle set in the software to achieve target boost pressure for the prevailing conditions (load and demand). It has the ability to adapt the duty cycle to cater for aging, thermals and such like... I don't know how much it can adapt by, but there are fault codes raised by the ECU if it detects excessive boost (unable to reduce duty cycle to achieve target) and for a failure to achieve the target boost if duty cycle cannot be increased within adaptation limits.
Something that occurred to me today about these dual port WG configurations is that the upper chamber MUST remain airtight for those to work properly. Note that many a wastegate cap that has been 'frankensteined' with an adjustable screw will not have an airtight upper chamber - even though the membrane to the lower chamber is a perfectly airtight seal.
As time permits I will do some dabbling with different springs and WG topology and make ECU tweaks to seek the best from them. I'll also test that turbosmart solenoid as well for kicks.
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