Bottas: It's "not normal" for Williams to be out-developed by Force India

Williams driver Valtteri Bottas says the team is "dissatisfied" with its recent race performances, as Force India closes in on its fourth place in the constructors' points.

Fernando Alonso, McLaren Honda F1 Team MP4-31 and Valtteri Bottas, Williams Martini Racing FW38

Despite upgrades with new front wing designs, Williams has struggled for pace in recent races.

Fellow Mercedes-powered team Force India is now just 19 points behind in the fight for fourth place.

Bottas is seventh in the drivers' points, seven points ahead of Force India's Sergio Perez.

"The team is working absolutely flat out at the moment," said Bottas. "We can see that some other teams, for example Force India, have managed to improve more during the season than we have done.

"That's not normal for us, normally we get gains from every single update in the past two years.

"I'm sure it's only a matter of time before we find solutions, but of course the focus for sure for everyone is already on 2017 – but it's something we need to understand [this year]."

Bottas will use a new floor that Williams has brought to Budapest, in an attempt to cure its inconsistencies and excessive tyre wear.

"It's definitely been up and down," he added. "For sure as a team we were hoping for a stronger first half but this is where we are now. We need to try and fight our way out of this position.

"We have Force India pretty close to us, they have quite a good car and have made some good improvements, so hopefully the update we have here is gonna boost us a little bit.

"In the Silverstone test we really focused on race pace, better tyre wear – which has been the main issue in the last few races.

"Let's see, but we're definitely not satisfied with where we are at this point."