A few months ago we talked about this (109 WEP) on the bugtracker:
http://www.il2bugtracker.com/issues/40.
QUOTE 41Sqn_Banks, translate by Kürfürst:
"Increase of output for takeoff (Allowed period: 1 min)
Through pushing the throttle the beyond "Vollast" (Full load, this is probably the 5-min rating - KF) position, without leaving it in the "Abflug" (Takeoff) position.
The holding of the throttle in the "Abflug" position is unnecessary, and therefore pointless; it will repeatedly return to "Vollast" position.
The mechanical clockwork, which is winded by pushing the throttle in forward will disengage the manifold pressure / boost increase automatically after 1 minute, regardless of the position of the throttle. Holding the throttle in the "Abflug" position does not restart or lenghten the increase in manifold pressure, instead it will just increase the richness of the mixture - and therefore no increase in engine output but an increase in fuel consumption - after the throttle has returned to its position."
