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For normal driving I just shift between 3-4,000. There is no doubt that for max acceleration you shift fast and hard at the redline to the next gear. The boxster power band(which varies only slightly if you have a base or S) is between the TQ peak of 4,500 and the hp peak of 6,200 rpm. The boxster acceleration drops off slightly from 6,200 to 7,200 rpm because there is less hp and TQ up there. However, you still receive the fastest times by shifting at redline because that keeps the car in the best part of the power band when you shift. The vario-cam sees the biggest switch at around 5,200ish rpm. That when you really start to move and you hear a noticable sound difference at WOT(wide open throttle).
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