Harvey,
What I meant about control in respects to boost was in reference to tuning while on my dyno.
I have a twin eddy current AWD Mustang dyno and while tuning, particularly with live tune systems such as the Autronic, the dyno alows me to hold any load and rpm I choose at a steady state. With my laptop, from the drivers seat, I can adjust air\fuel, timing & boost while watchig EGTs , Knock signals and torque loads.
All done live action with instant feed back.
This how I can 'sneak up' the boost particularly in the low rpm knock prone areas, with a turbo.
To do this with a blower I would have to set best settings for a given pulley size, graph it, change pulley size, set best, graph again, compare graphs, possibly change pulleys again etc.- Its a little more tedious but thats how its done if you are searching for the best boost curve an engine can take.
Which ever system you choose to run is up to your personal need or skill.
They all have their strengths and weaknesses.
As long as you end up with what you where looking for its all good.
Getting an engine to tell me what it wants is the easy part.
Getting the customer to make up their minds and tell me what they want is the hard part.
By the way Harvey- are you anywhere near Melborn?
I could use a good deal on the new Autronic SM4 with the add on knock control board.
The Spindoctor