Lotus has confirmed that it will not run its DDRS device at the Japanese Grand Prix this weekend.

In a statement to the media the team said it was not able to get it 'functioning at a sufficient level [during practice today] for it to be used'. The team did, however, report 'good progress dialling in the new floor as well as both the front and rear wings', and while a KERS problem sidelined Kimi Raikkonen in FP2, Romain Grosjean showed the potential of the E20 and ended up sixth overall.

"We suffered a disrupted day with Kimi's car but despite that we've achieved a reasonable amount," said technical director, James Allison. "We evaluated 'The Device' in the morning but were unable to make it switch effectively so we won't be using it for the rest of the weekend.

"Romain suffered from understeer in the morning and by the time we had put this right he had already used up the best performance from his tyres. In the afternoon, with a better set up, he showed that there's still a reasonable turn of speed in the E20. We look in OK shape on both the hard and soft rubber as well as on high fuel, and we feel there is more to come from the car tomorrow ahead of qualifying."

Grosjean and Raikkonen meanwhile echoed those sentiments and both remain pretty optimistic: "Not a bad day overall. The car felt much better in the afternoon than it did this morning; we're still not quite where we want to be but the team has been working hard and hopefully we'll make a similar step forward tomorrow," Grosjean remarked.

"Suzuka is not an easy track on the car; the demands on the tyres are really high but the car felt consistent with both compounds which is a big positive. It's hard to say if P6 is the kind of position we'll be in qualifying; there are definitely still a few tenths we can find so let's see what happens tomorrow."

"We didn't get much running because of the issue with the KERS, but at least it happened today and we got it fixed," added Raikkonen, who was limited to just 12 laps in FP2, less than half that of most of his rivals.

"It wasn't ideal for helping us find the best setup but there's nothing you can do about these things. Suzuka is not the easiest place to get the car set up, but we still have tomorrow's practice before qualifying.

"I think we have the potential to be nearer the front than we have done in the last couple of races."