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Really, ? That's the opposite of what I figured.....
My logic was, waste gate is actuated by boost pressure. If wastegate is set to 11 psi, then at 6 psi (normal cruising boost) the wastegate is already being acted upon by boost and is starting to crack open, wasting some exhaust that could be doing work..
So, with boost controller cutting off all wastegate action until exactly the moment of preset boost, all exhaust goes through turbine until last minute......
Ergo, higher cruise boost!
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-Matt
EPA Section 609 Certified MVAC Technician
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Oil Burner Kartel Member #10
Ahh the smell of Diesel Fuel, it's like coffee in the morning!
My Car:
1982 300SD Turbo Diesel (231,500 miles!) RIP 
1984 300SD Turbo Diesel Custom (235,500 mi on driveline.) - On Road!! 
www.icsrepair.com
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