Somebody with more knowledge might be able to clarify further but I believe that a false load is entered into the tune to allow the turbo to boost? Hence why no boost is made when free revving the engine vs running launch control. I could have misunderstood the explanation from my tuner though

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[SIGPIC][/SIGPIC]

02 Bug Eye Hatch, HSD Coilovers, Built 2.2 Stroker, 6 Speed with Cusco 2 Way, Autronics SM4

366Hp and 472 Nm at the treads
Personal Best 12.5 at 112 MPH
Need more practise