Notas técnicas Renault 2007
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I. Chassis
Aerodynamics:
The contrasting nature of the Interlagos circuit makes very different demands on the cars. The first and last sectors are made up primarily of long straights, where good top speed is necessary to maintain competitiveness and protect position; this means a low level of downforce are required. However, the middle sector requires the opposite: high downforce to ensure good grip under acceleration, braking and cornering through the twisting series of hairpins. Balancing these requirements gives an optimum downforce setting for achieving the fastest possible lap-time.
However, this optimum is then skewed by the demands of racing with other cars. To do so successfully requires competitive end of straight speeds -- and achieving these may drag us away from our optimum downforce to a slightly lower setting which allows the drivers to overtake and defend their position into turn 1. This means we use downforce levels similar to a circuit such as Bahrain.
Mechanical:
The combination of high and low speed corners means it is hard to find a suitable mechanical compromise at Interlagos. Just as with our choice of aero level, we priorities certain sectors of the circuit over others. The most important corner at Interlagos is turn 12, as it determines your speed along the uphill main straight -- a full throttle period lasting over 15 seconds. We therefore pay special attention ensuring the car gets a good exit from this corner, even though this can generate some slow-speed understeer in the middle sector.
However, any losses incurred with this understeer are outweighed by the benefits in lap-time and competitiveness achieved in sector 3. The second important factor for the mechanical set-up is the track surface. This was traditionally very bumpy, but the resurfacing in 2004 allowed teams to run lower ride heights, and the situation may have improved once again for this year. The circuit is relatively easy on the brakes, with just three major braking events, and the overall braking energy is similar to Barcelona.
Tyres:
Interlagos includes relatively few high-speed corners with high lateral loadings on the tyres.
II. Engine
Performance:
The long main straight at Interlagos means engine power is a critical factor at this circuit, and the longest single period at full throttle is over 16 seconds. All the engines, though, must contend with the effects of running at altitude, as the circuit is situation around 800m above sea level. The reduced atmospheric pressure costs the engines around 7% of their power output; as a result, the 61% of the lap spent at full throttle is equivalent to 57% at sea level (comparable to Budapest).
While this reduces the demands on some components such as the pistons, other parts of the engine such as the crankshaft are still subjected to significant loadings. Driveability is also an important factor, especially through the winding middle sector. The drivers run in the lowest gears at this point on the circuit, with sudden changes of direction and significant brake and throttle inputs. Smooth power delivery can make a real and significant contribution to maintaining a stable balance, and optimum driving lines, in this part of the circuit.
Notas Bridgestone
Este año van un grado más duro que el anterior:
Hirohide Hamashima - Bridgestone Director of Motorsport Tyre Development:
“We expect a lot of graining, especially at the beginning of the weekend. There are two reasons for this; Interlagos often has a very dirty track surface and the twisty infield layout makes graining likely, regardless of the track surface conditions.
Interlagos is a track which is deceptive as it is not as harsh on tyres as you would think, although the weather conditions can play a big part, especially if it is hot like it was last season.”
Last year we were too soft in our allocation and we saw blistering on many tyres, even those used by competitors who we would expect to be quite gentle on our tyres. We expect the medium and soft compounds be a good choice, plus the change will provide teams with a challenge, especially as the track surface will have evolved from last year when it was brand new.”
Pronóstico del tiempo
A 8 días, todo puede cambiar, pero de ser así, McLaren es el beneficiado. El porcentaje es la prob% de lluvia:
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