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Didn't update the topic because I was bussy...
I have changed the old vacuum lines with 3.5mm silicone ones, except the line that goes from the pressure converter to the wastegate...still the same problem
By the end of the week I will hopefully try a new pressure converter for the turbine changeover valve...maby things will change.
Yesterday I drove the car with ISTA running.
Monitoring the charge air pressure values I noticed this.
4th gear from 1000 rpm to 5000.
Desired boost is 3000mbar at about 1100 rpm. The car only makes about 1100mbar at that rpm. As soon as it reaches 2000rpm actual boost pressure is at about 2000mbar.
Anywhere above 2200rpm, actual boost level is 3000mbar.
If it's not the pressure converter, honestly I don't know what to do anymore...everything is checked...vacuum hoses, vacuum actuators do not stick and they hold vacuum.
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