The tune controls the wastegate. As the wastegate is opened by boost pressure, it's closed to begin with ( no boost to open wastegate). The lovely 1.8T can be mapped for boost to come on early or late, early giving more low torque or late giving more top end power.
1 bar of boost from a tune alone is not a problem, but also not expected with no other mods. If you don't put your foot flat, you will have less boost but with improved torque and i believe improved spooling.
It's the boost controller (in our case N75) that controls the boost onset. The programming of the N75 controls lag.
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