Barcelona F1 test: Force India focused on 2015 tyres with 2014 car

With its new challenger not expected to be ready until next week's final pre-season test, Force India has had to run an updated VJM07 this time out.

Although the test holds little value in terms of car preparations, Perez says that his running on Friday was invaluable for the good tyre knowledge he has gained.

"It was really positive and we had a really good comparison back-to-back with the tyres," explained the Mexican.

"We understand properly the tyre difference from this year to last year.

"The most positive thing today is we really learned about the tyres, and how they work.

"We did a lot of set-up changes with the tyres just to understand the compounds.

"So in that respect I think we are optimistic and really looking forward to the new car."

Perez is mindful, however, that having missed the first two tests with Force India's 2015 car, next week's running has to be troublefree if the team is going to start the season in good shape.

"Hopefully the new car turns up and we can do some proper mileage with it," he said. "Let's be positive.

"We don't really know, and you never know how a new car is going to turn up.

"It might turn up and give no problems or turn up and you don't do any more than 6/7 laps. It depends."