KERS is another issue that still worries the world champion team, while other team members saying KERS is no longer a worry ahead of the Turkish grand prix.
Dr Helmut Marko and Sebastian Vettel said this week that, after earlier problems with the technology, modifications over the Easter break had eased concerns for Istanbul and beyond.
But Australian Mark Webber is quoted by F1.com: "We are not out of the woods completely. The guys are working incredibly hard on it, but it will take time. Let's say we are at 70 per cent now, so let's hope come the next few races we are all clear."
RB7 designer Adrian Newey is no fan of KERS, but he is determined to make it work in 2011.
"In 2009 it was possible to win the world championship without KERS. Not now," the Briton is quoted by Cologne Express.
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| Mark Webber - Photo: Pirelli |