Ferrari is reportedly on the road to recovery after getting to the bottom of a wind tunnel problem that has affected development of the 2011 car.
It had been reported that a calibration problem with the team's Maranello tunnel had forced engineers to turn to Toyota's state-of-the-art facility in Cologne with a view to recovering before the world championship is lost.
Felipe Massa drove the 150 Italia car for a filming day at Fiorano last week, but the 2011 model was also being tested on the long straight at Vairano.
Auto Motor und Sport reports that, since early April, development of the car has split into two programmes: normal development and getting to the bottom of the wind tunnel problem.
Test driver Jules Bianchi was at the wheel of the car's Istanbul upgrade at Vairano, south of Milan, last Thursday, and according to the German magazine the package should now "reflect on the track what is promised by the factory".
Among the new pieces that are expected to work in Turkey this weekend are new front and rear wings, and brake ducts, with floor and exhaust parts in the pipeline for Barcelona and Monaco.
A confident Fernando Alonso is quoted as saying: "McLaren did it, we can too."