The one reason that I heard is that once the car is modified in a way which affects sensors (MAF, o2), these parameters the sensors are reading is off from the stock inputs which causes the ECU to interpret and then adjust which may take slightly longer for the ECU to respond to input such as the throttle. I felt the throttle response was a bit faster and more punchy after my tune but I never had anything near what some of you guys are getting in terms of lag and diminishing power.
Granted, there is a problem with stock Zs as well so this isn't a meaningful explanation.
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-320whp / 259wftlbs-
SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob
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