Toro Rosso have admitted that predicting next week's return to testing action in Bahrain is "complete mystery" after the events of Jerez.Having ended their seven-year association with Ferrari and aligned themselves with senior sibling Red Bull F1's new engine era by switching to Renault power, Toro Rosso ran into similar issues to the World Champions with the French manufacturer's problematic new turbo power unit at the opening 2014 test. In all, Toro Rosso completed just 54 laps across the four-day test and now need to recover lost mileage to their rivals across the back-to-back tests in Bahrain, the first of which begins on Wednesday February 19. 'How do we expect to get on at...
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