Toro Rosso driver Jean-Eric Vergne believes the Faenza team is being held back by Renault's power unit during testing. The Italian team managed to complete only 139 laps over the four days of testing in Bahrain last week, with only Red Bull, Lotus and Marussia completing fewer laps. Both Red Bull and Lotus are supplied by Renault as well.
Vergne struggled in during the final day of testing in particular, completing just 19 laps before a problem with the Renault power unit forced him back to the garage.
"Yes, sometimes it's the engine and sometimes it's ourselves. But the problem is when you stay in the garage so much. You see the problems with a new car when you drive, so that's a bit...
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