Re: My Chica Italiano @30000 km It is not actually tuning of ACC. It is merely a change of instruction, ECU telling the ACC to change the cut-in/cut-off cycle, especially during the clutch engagement. IIRC, this setting was changed because while driving in heavy traffic lot of people drive on half clutch or keep the clutch pedal depressed. With the the earlier settings, ACC used to cut off as per normal cycle and cutting in required extra effort to bring cooling to desired level due to slow speeds; effectively lowering the ACC performance. So this tinkering will in no way hamper the torque curve IMHO.