The 2017 map (
http://fiawec.alkamelsystems.com/Res...CircuitMap.png ) says the Porsche section goes from 11377,7m to 12509,3m or 1131,6m.
In the Specific Sectors (
http://fiawec.alkamelsystems.com/Res...actice%202.PDF ), the best time of 14,203s equates to
1131,6m/14,203s = 79,7m/s or 286,8km/h
while the PDF says it is only 261,6km/h (this speed would mean a length of 1032,1m, the section for 2016??). So the timekeepers probably forgot to change the length of the section in the speed calculation.
Edit: 286 seems a bit high, so maybe the timed section remains at 1032m and the circuit map is wrong?