Ferrari has admitted that crucial upgrades to its F2012 car will not work as expected.Team boss Stefano Domenicali said his team needs to find at least two-tenths of a second to boost Fernando Alonso's chances of competing for the title against Red Bull's Sebastian Vettel.Test driver Davide Rigon, at the wheel of an upgraded Ferrari, reportedly ran a "secret" straight-line aerodynamic test at the Idiada facility in Spain.'HAD SOME PROBLEMS'Alonso's team mate Felipe Massa admitted the team had had problems in 2012 with the correlation of data produced by its Maranello wind tunnel, which will be closed for repairs.Massa said: "We are working on a lot of things in the development of the car but we have had some problems with parts we have brought to the last few races not working on the track."Ferrari is already working and checking data in Toyota's Cologne wind tunnel but Domenicali does not want the news to be interpreted as an excuse for Ferrari's recent development problems."That's part of the development process we are doing to improve the team," he said, "but I don't want to hear that it's an excuse for this championship. We need to keep pushing to make sure Fernando has the best car for the end of the season."