In the autobiography of a Soviet IL-2 pilot, it is revealed that the IL-2 had an emergency power setting. It is referred to as "forsazh".
The Book is Red Sky, Black Death by Anya (Anna) Timofeyeva-Yegorova. Translated from Russian and published by Slavica Publishers, Indiana University. ISBN 780893573553
In the book, this pilot's IL-2 was tail-end charlie of a group of 6 IL-2s. It is being attacked by several Bf 109s from behind. Here's the passage.
"After another hit from close-range, I engaged forsazh
1 mode, shoved the control stick forward to gather some speed, shot past the group."
Footnote at bottom of page:
1 Literally "boost," or "power augmentation". Similar to "War Emergency Power" in U.S. military aircraft of that era. "Forsazh" is an emergency power setting to increase the engine power above safe limits, used only for a few minutes at time because of the additional stress placed on the engine.
My regards,
Widewing