This is due to programming. When you floor the gas pedal, the computer is not opening your throttle completely. This is normal and is set that way from the factory for safety. So when you give it 60% throttle, the computer may actually give you the full 60%, hence it may really be faster than giving it 100% all at once because the computer might be holding back the actual throttle plate opening to less than 60%.
What is peculiar is that since you already have twin turbos on the car, that your tuner did not correct this factory throttle delay when they tuned your car. I would ask them if they worked on the throttle settings and if they didn't, I would ask them if they could fix it for you (since they should have done this during the initial tune).
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2012 PW NISMO #0559 - GT Spec Brace Kit - Swift Springs - ARK TP & Invidia CBE K&N Intake - UpRev Tune - 15mm Z1 Spacers & Studs - StopTech Slotted Rotors & SS Lines - ZSpeed CMAK with Stage 2 Clutch and Lightweight Flywheel
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