Adrian Sutil declared himself pleased with the early performance of Force India's new blown diffuser after trying the part for the first time during Friday practice in Hungary.

The team elected to run a back-to-back programme during the day, with Sutil running the part on his car and Paul di Resta and Tonio Liuzzi running without it on the sister car as they shared driving duties.

Although he admitted to not getting the best out of the car, Sutil's programme was focused on data collection rather than chasing an outright time with the German hopeful of more progress on Saturday morning.

"Today my main goal was to get as much running as possible with the new blown diffuser," he said. "We made very good progress in this regard and didn't have any real problems with it, which is a major achievement given how big a component it is to introduce. It seemed to work quite well with the various mappings, and also the temperatures look under control so we can be quite confident in it.

"But in general we didn't get the best out of the car today. We are struggling a little on the softer tyre and neither Tonio nor myself could improve from the hard tyre. There doesn't seem to be a peak with it, unlike the hard tyre that you know will peak and come in, but it's much more difficult to understand where we are with the soft one. We'll continue to look at it and hope that we can improve tomorrow."

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