Ford FIESTA ST 2018 Supplement Manual page 18

Driving Hints
The system allows a maximum of 20
seconds of engine overboost. After this
the system reduces turbo charger boost
and maximizes it at a predetermined limit.
Once the turbo charger boost drops below
the predetermined limit the system resets
and a further 20 seconds of engine
overboost is permitted.
Note: You do not need to take any action
as the system allows overboost when you
demand it.
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2018 Fiesta ST (CCT) ST, Canada/Mexico/United States of America, JE8J 19A285 HA enUSA, Edition date: 201706, First Printing