Sergio Perez says he expects Force India's revised package for the VJM09 to have a noticeable impact on the team's form from the Spanish Grand Prix, labelling it a 'proper upgrade'.

Force India is one of several teams to use the first Barcelona race as an opportunity to introduce new parts and upgrades, though Vijay Mallya revealed earlier this week that the VJM09 will look 'quite different' as a result.

Having managed just eight points from the opening four rounds, Force India is pinning hopes on the update improving performance, tyre life and drivability, with Perez confident it will achieve its objective.

"We've got a good upgrade," the Mexican said. "We hope that everything works as expected, which generally is not the case. It will need a lot of understanding and learning as well as it is a proper upgrade, so we need to understand the package properly."

"We are expecting a good step. More than lap time-wise we are expecting the drivability feeling. We have been really harsh on the tyres and we feel if we can correct some of the characteristics of the car we can help tyre life as well which long-term speaking is a good advantage on tyres. So that can help us in managing the strategy better, going for more aggressive ones, stuff like that."

Adding that the VJM09 has a 'weak front wing' that is having an effect on balance, Perez expects the upgrade to provide a fix for this at least.

"We believe we have fixed the problem with the new upgrade hopefully. So by not making it work that meant we had to fix it mechanically and that meant basically more damage to the tyre. I won't go in to too much detail but in general aspects the car was not performing as expected and we had to compensate by the set-up. So we were compromising the tyre life for it."



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