May 5 (GMM) Sebastian Vettel insists he is not worried about KERS in Turkey this weekend, nor a repeat of last year's clash with his teammate Mark Webber.

Red Bull left China three weeks ago with clearly the fastest car but far from the best KERS system, after Adrian Newey repackaged the Renault-based unit over the winter for best aerodynamic performance.

That caused cooling problems at the first three races of 2011, but Dr Helmut Marko insisted this week that the team used the Easter break to fix the system.

"We have had some problems but have had very good people working on it," agreed championship leader Vettel to Auto Motor und Sport.

"That's why for this next race I am not worried," he added.

The German also revealed that the RB7 will have some other improvements for Turkey this weekend.

"When I asked the team what (new) to expect, I received many answers," Vettel answered coyly. "You'll have to ask them for yourself."

Also in the back of his and teammate Webber's minds at Istanbul Park will be their clash last year, which brought their working relationship under severe strain.

Asked about the crash a year on, Vettel told DPA news agency: "I cannot change what has already happened, but I can learn from it."

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