Toro Rosso will hope for a better second day of running in Valencia after gearbox issues plagued Sebastien Buemi's first run in the new STR5 yesterday [Monday].

The team launched its 2010 F1 challenger at the Spanish circuit just before the first pre-season test of the year got underway, but it proved to be a troublesome day for the new car as Buemi managed just ten laps before being forced to return to the pits with a gearbox control problem.

The issue ultimately kept Buemi off track until the final half hour of the day before he returned to action and ended up with the seventh quickest time of the eight drivers present.

"This morning, we had a problem, which took a long time to analyse," Buemi said after Monday's running. "We managed to get out again towards the end of the day, even though the fault was not completely fixed. At least we managed some running, which allowed us to work through the usual new car procedures, such as checking seat position, visibility from the cockpit, the systems and so on. But it is a bit too early to get an impression of what the car is like, especially those elements affected by the rule changes."

Technical director Giorgio Ascanelli admitted it was difficult to read too much into the first day of running due to the problem and said the team was hopeful of a better day on Tuesday.

"This morning we had a problem with one of the gearbox actuators, which we managed to improve, but not fix completely," he said. " It is too early to make any comment on the actual performance characteristics of the new car. In the short term, we will be trying to fix the actuator problem overnight, in the hope of having a better day tomorrow."


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