FORCE INDIA please log in to view this image Force India, with its Mercedes engine installation, appears to have used the rollhoop as a means of feeding air to a small ERS cooler. The team has both a rollhoop inlet and a piggyback inlet above and behind it. Typically on a pre-2014 car, the larger rollhoop inlet would feed the engine with air and the piggyback would feed a small cooler. This situation appears to be reversed: because the turbo 'sucks' in air more effectively than a normally aspirated engine, its need for a large inlet is reduced. On the Force India, the larger inlet is ducted downwards to feed what appears to be a small cooler for the ERS, while the piggyback routes back to the turbo via an air filter panel. There's no immediate performance gain from this - it's just a neat packaging solution.
