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dr. science says ...
torque at wheels = flywheel torque * gear ratio
using the torque curve for a 987 that I found online, torque peaks at 4500 rpm (360 NM) stays flat to 5500 rpm, then drops to redline at 7000 rpm (280 NM).
here is a chart that shows gear, ratio (taken from california motorsports website for a 986S 6-speed transmission) wheel torque at max rpm, and wheel torque at max torque:
1 3.818 1069 1274
2 2.200 616 792
3 1.516 424 546
4 1.216 340 438
5 1.024 287 369
6 0.841 235 303
so, if you compare wheel torque at max rpm to wheel torque at max torque in the next higher gear (ie, an upshift at 7000 vs an upshift at 5500 with rpm drop to 4500 to 'stay in the power band') you'll see that this produces less power in 1st and 2nd gear than staying to redline. the upshifts from 3rd, 4th and 5th are a wash and most likely eclipsed by the loss in power to the ground during this shifting process.
dr. science says hit the rev limiter.
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