LOL its not really required for selecting shift points anyway, its more for deciding on gearing changes. You can see for yourself on that ITR graph that there is never any point on the graph where the next gear up was able to get more power to the axles than the gear before it. So you shift at redline for best acceleration.
You can also notice that the transmission gearing was intended so that if you shift at redline, you are landing in the peak of the next gear. To shift any earlier would cost major power... so you only do that if you cant use the power anyway.
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