Indian Grand Prix Preview: Buddh

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India, a new addition to the Formula One calendar in 2011, features some sweeping elevation changes and a wide variety of corners, making it a truly spectacular venue that works the tyres hard, especially given the high ambient temperatures. After two years of nominating the hard and the soft compound at the Buddh circuit, this year Pirelli has opted to nominate the P Zero White medium tyre together with the P Zero Yellow soft tyre.

Paul Hembery: “We’ve decided to go for the P Zero White medium and P Zero Yellow soft tyres in India this year, which we think will be the best combination for the Buddh circuit and lead to closer racing. For the last two years running we’ve actually gone for the hard and soft compounds, which might have been slightly on the conservative side, so this year we’ve gone for a softer and slightly more aggressive choice. As a result, just like the last race in Japan, we’re not expecting to see a particularly big variation in lap times between the two compounds. Consequently, the strategy made a very big difference in Japan and this should be the same in India. We only had one pit stop per car in India last year, but this year we would expect two – which also provides the drivers and teams with more opportunities to make up places. With varying elevations and a wide variety of corners India provides the tyres with quite a test, as there are forces coming from all directions, so tyre management will once again prove to be important. As usual, it should be very warm in India, which increases thermal degradation as well. This looks set to be a decisive race for the championship so we hope that our tyre choice will help to make it a memorable contest with high-quality racing.”

The circuit from a tyre point of view:
One of the most challenging areas of the circuit is the complex that makes up Turns 10 and 11: both of which are taken in quick succession almost as single corner. The tyres have to withstand a high-energy lateral force for around seven seconds. The front-left tyre is worked hardest here, and it has to withstand an acceleration force of up to 4g on the exit of the corner, where maximum grip is needed to hold the racing line.
Turn 4 is another crucial area of the circuit. Here, the cars decelerate from 320kph to 90kph in just 140 meters. The tyres are subjected to a deceleration force of 3.6g, but still have to guarantee stability and precision throughout the braking area.
India also has one of the longest straights of the year, which is more than a kilometer long. The tyre rotates around 50 times per second at full speed, and by the end of the straight the temperature on the tread can exceed 100 degrees centigrade.

Technical tyre notes:
The pit lane in India is one of the longest in Formula One at around 600 meters. This leads to a relatively significant time loss when changing tyres, which is an important factor when considering the race strategy.
The track surface in India is generally not very abrasive. However, having made its debut only two years ago, the asphalt is still evolving. Over time, new asphalt tends to get rougher, as the bitumen on the surface is swept away, leaving the stones that make up the asphalt exposed. This increases abrasion, which has an effect on tyre wear.
All the finishers at last year’s race – where the hard and the soft compound were used – stopped once only, at around lap 30. The most popular strategy by a long way was to start on the soft compound and finish on the hard compound, although one or two drivers further down the grid used the opposite strategy to their advantage.

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