Formula 1 gossip and rumours from international media

Ferrari's engineering department have stepped up investigations as they attempt to find out why their 2011 car did not perform as expected in the first three races. The Italian team will bring new front and rear wings to this weekend's race in Istanbul as well as modified brake ducts. Full story: Auto motor und sport (in German)

Pirelli are planning to introduce a new version of the hard tyre from the Spanish Grand Prix onwards - once it has been tested during Friday practice in Turkey. Pirelli motorsport director Paul Hembery says the new tyre should "give two or three more laps tyre life and less degradation". Full story: Manipe F1

It is business as usual for Williams technical director Sam Michael, who announced he is standing down at the end of the season. Michael says the team are looking to get into the points "as soon as possible" and will bring new brake ducts and a revised front and rear wings to Turkey.Full story: Williams

Williams chairman Adam Parr says he tendered his resignation in light of the team's poor start to the season but that he was turned down. Full story: Autosport

Heavy metal legends Metallica will play their first concert in India over the grand prix weekend in Delhi in October. The group announced on their website that they are going to "help to celebrate the first race ever held in India". Full story:

Hispania driver Narain Karthikeyan makes the most of his final day off before the Turkish Grand Prix. He reports on Twitter: "In Delhi, having lunch with friends before we leave for Istanbul later tonight." Full story: Narain Karthikeyan on Twitter

This story will be updated throughout the day.

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