Ferrari "believe" their updated F2012 package will be a "step forward" but how big a step they won't know until qualifying in Spain.
After a disappointingly slow start to the 2012 season, Ferrari introduced several updated parts for their F2012 during the in-season test at Mugello.
The team, though, only tested some parts, opting instead to put other developments through the wind tunnel before incorporating them at this weekend's Spanish GP.
As for whether these changes will put Ferrari higher up the grid, official spokesman Luca Colajanni says only time will tell.
"Based on what we saw in Mugello, where we introduced the first part of the package we've prepared, and based on the numbers we collected there and from the wind-tunnel, we believe we have made a step forward compared to ourselves," he told Sky Sports News.
"How big [it is] and how much we can catch-up compared to the others, it's difficult to say until we've seen everyone else showing off their cars because I'm pretty sure that everyone will bring everything they have in their pocket here."
"I believe we will have the first feeling on Friday, but the first answer only on Saturday."
Ferrari have claimed one victory to date this season as Fernando Alonso triumphed in the wet in Malaysia.
After four races he is fifth in the Drivers' Championship on 43 points while Felipe Massa is well down the order having bagged just two points.