Scuderia Toro Rosso have vowed to get the bottom of their reliability woes after suffering a second consecutive double retirement in the Spanish Grand Prix.

On a weekend that has seen both cars of Vitantonio Liuzzi and Scott Speed suffer a number of mechanical dramas, Speed was eliminated first by a spectacular tyre blowout down the home straight, Liuzzi joining on the sidelines ten laps later with hydraulic problems.

Having also been affected by issues in practice and qualifying, the Toro Rosso duo were hoping to complete a race distance, not least because a strong first few laps saw Speed up to 14th from 22nd, with his team-mate following close behind.

"The start and the opening couple of laps were fun, going from last on the grid to fourteenth," Speed said. "Then a couple of laps before I retired I noticed the tyre was going down so I was evidently losing some air pressure. Eventually the tyre just exploded as I was going down the straightaway. The car dragged on the track and there was no way to continue."

Liuzzi was also frustrated to have contributed to an attrition rate that could have seen the Italian registering a potential top finish if he had reached the chequered flag.

"I retired with a hydraulic problem. We have been suffering with mechanical difficulties since Friday. I had another problem at the start and lost three places. Of course it's a shame as many other cars seemed to have problems and we could have made up even more places and I was already up to 12th when I had to retire.

"Our race pace is definitely better than in qualifying and so that is something we must now try and improve on before Monaco, as well as working on reliability."

With a test at Paul Ricard planned before the next round at Monaco, Franz Tost insists they will use it as an opportunity to find some durability.

"A very disappointing weekend. The start was okay from both drivers who did a good job in the early laps. Unfortunately we then suffered a technical failure on Tonio's car as he lost hydraulic fluid. We will now have to investigate to find out why.

"Scott had a problem with his left rear tyre. This will also need investigating. Now we are testing at Paul Ricard where we will have to work on our reliability issues."



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