Lotus will not run its rear wing 'device' at this weekend's Japanese Grand Prix after it failed to offer a significant advantage in Friday practice.

The system, often dubbed the double DRS, was fitted to the car for first time since practice for the Belgian Grand Prix, but again the team struggled to get it working properly. Kimi Raikkonen said a number of problems with the 'device' meant it would not be fitted for Saturday and Sunday.

"It worked a little bit but we're not going to run it," he confirmed. "Plus we had some other issue during the running so it probably didn't help to get the best out of it. But it's not going to make us really near the front if it would work 100%.

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