Bruno Senna says Renault has "a long night ahead" to improve the car following practice for the Singapore Grand Prix.

Following two low downforce tracks where Renault was strong, the Marina Bay circuit does not suit the R31 and Senna was 13th in FP2; 3.8s slower than Sebastian Vettel. Senna said that the day had seen some progress made, but that the onus was now on the team to work on the car to make it as competitive as possible in the grand prix.

"We made a step forward with the balance over the two sessions but there is still some work to be done to get the car race-ready," Senna said. "We have a long night ahead of us to figure out what we are going to do. On the upside, I managed to complete a good number of laps and there were no incidents nor was there damage to the car.

"We managed to steer clear of any major difficulty and this was the main objective of today. We need to work hard before we get to FP3 tomorrow in order to understand what we can do to improve our pace and consistency, as there's more to come from the car this weekend."

Vitaly Petrov did praise the team however, following some major work that was required in FP1.

"Unfortunately we lost FP1 because the engine overheated a little, so we had to revert to older specification bodywork," Petrov said. "My mechanics did a fantastic job to prepare my car for FP2 - a big thanks to them. It is difficult to catch up in the second session when you've lost a great deal of time in the first, but we know what we have to do for tomorrow and we know which way to move to get the most out of the car this weekend."