Eric Boullier is demanding McLaren Honda cures its reliability woes ahead of the Japanese Grand Prix but is bracing for another difficult race weekend.

The Woking-based team suffered its fourth double retirement of the year in Singapore with both Fernando Alonso and Jenson Button failing to reach the chequered flag due to gearbox problems.

The F1 paddock gears up to transition from one of the slowest races of the season into the fastest at Suzuka and Honda's first home race since its return to the sport.

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The McLaren racing director says it will be an 'extra-special' occasion at its second home race but needs his team to improve its reliability if it is to put on a good show in front of Honda chiefs.

"Since it's the home of Honda returning there this year will be even more emotional than normal," Boullier said. "First and foremost, to give ourselves any kind of fighting chance next weekend we must focus on our reliability after the disappointment in Singapore. From Marina Bay, one of the lowest-speed tracks on the calendar, we go to Suzuka, one of the fastest, so preparation will be key.

"It'll be interesting to see how the drivers and cars cope with the challenge of the downhill grid, and the famous figure-of-eight Suzuka circuit is always a fantastic spectacle in front of the most enthusiastic fans we see anywhere in the world."