Oops. I explained some of the details a bit wrong. It's just under 80 degrees angle that is effectively full throttle (not just under 80% open). The throttle position is a percentage of 90 degrees. 80 degrees is about 88% of 90 degrees. The throttle position will get up to around 88% at full throttle, but only at higher engine speeds. The ECU reduces the operating range of the throttle blade at lower RPM because air flow rate is much lower, and there's no need open the throttle blade all the way to 88% (80 degrees) to achieve maximum unrestricted airflow at lower engine speeds. By scaling down the operating range of the throttle blade at lower engine speeds, it removes a "dead zone" at the end of the pedal travel near full throttle and makes throttle control less sensitive (easier/smoother) without reducing full throttle power.
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