Romain Grosjean says getting the tyres to work on his Haas car appears key to unlocking the potential from the VF-16 as he endured a trying day in free practice for the Russian Grand Prix.

Following two sensational races in Australia and Bahrain, Haas suffered a tough Chinese Grand Prix as it struggled with tyres and set-up, an issue that has continued to make its presence felt around the Sochi Autodrom.

Indeed, though Grosjean says lessons were learned after Shanghai, the Frenchman - 17th quickest after FP1 - he feels there are still plenty of question marks to understand before Haas can make a step forward again.

Related Articles

"I think we have to make the circuit suit us. It is a very different one from China and I was expecting a bit more from the car today. I think we are struggling a little bit with a few issues that we may have started to have in China - getting the tyres to work properly.

"That is the only big difference that we can see from the first two races. Hopefully things get better for tomorrow: we get the right answer and the guys will work hard to evaluate what we can do.

"We need to analyse the problems. Since Friday in China I am not happy with my car, it was the case again today. We need to understand what could possibly go wrong and hopefully change it. I think there is a lot of work in progress, a lot of question marks. A lot of data. It is hard to trust everything but by tomorrow I think we find some good solutions."