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Originally Posted by JoeW04
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I believe this is possibly part of the anti-lag strategy (ALS) to keep the engine boost pressure up to a drivable level, whereby some extra fuel is injected when off-throttle, it ignites when it touches the hot exhaust manifold and causes a series of bangs through the exhaust turbine to keep it spinning for constant boost.
over-fuelling is generally frowned upon in endurance racing as you are otherwise wasting precious fuel......they possibly also have a fresh-air valve system to help air bypass the engine and go straight into the exhaust to help keep boost pressure up.
It was an ALS system pioneered in the early days of Turbo F1 cars in the 1980's, and then exploited further in WRC in the 1990's.......but the bangs were on another level.