Sebastian Vettel's final day of pre-season testing has turned into something of a nightmare after a number of issues for the German severely limited his running in Barcelona.

Day four of the test at Catalunya was Vettel's first chance to sample the revised RB8 that was debuted by team-mate Mark Webber on Saturday.

However, issues with the gearbox and an off-track excursion that damaged the nose on the car mean that Vettel sat bottom of the times heading into the final two hours of running - having completed just 15 laps.

By contrast, McLaren's Lewis Hamilton had managed more than 80 laps at the same point with more laps than anyone else.

"This morning I went off track and it broke the front wing, and then it took quite a while to get back out on track again," he said during a media briefing at Catalunya. "Then just before lunch I suffered a problem with the gearbox and we have to fix it and get back out."

The limited laps have left the defending champion in a position where he can't yet judge the impact that the upgrades fitted to the RB8 have had, with the German admitting that it wouldn't be clear who is the benchmark team until teams arrive in Australia.

"It wouldn't be fair so far to judge it because I have done so few laps," he said. "[However] you never really know where you are until you get to Melbourne and everyone puts their cards down and you show what you have got in qualifying.

"In testing, you always have things you hope were better, there are not many years you can give yourselves a ten out of ten. Overall we can be quite happy, happier than five and less than ten. Somewhere in between."


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