rear wheels turning? The directional rear axles are current in recent days, which surprised us somewhat, if we consider that it is a relatively old technology (such as the Honda Prelude models already used in the eighties). And it is topical for their arrival in the new Mégane (see analysis 4Control in the Mégane GT) and also the renewed arrival Porsche 911 Carrera S 2016 . The technology addresses the rear axle he extends the range of access Porsche 911. What are the advantages? Is it worth it set?
According to the rotation of the rear axle, for or against the front axle, the Porsche 911 shorter turning radius and increases stability when cornering at high speed.
Let’s start with the price. The directional rear axle has a cost of € 2471 in a Porsche 911 Carrera S , which a priori may seem expensive. Proportionally, in a sporty over 123,000 €, is an almost insignificant price.
Technically is based on two electro-mechanical actuators , one on the left rear wheel and the other on the right, which vary the angle of the wheel to 2nd. According to Porsche, if compared with the rotation of the front axle to achieve that shift need a wheel spin to a quarter lower, around 32 ° from the center position.
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The directional rear axle of the Porsche 911 Carrera S can rotate in two directions of rotation for the front axle, or in the opposite direction. So two utilities, and the two great advantages of installing this system in a 911
When you turn the wheel at speeds below 50 km / h , for example for a parking maneuver or maneuver between columns in a parking lot, and narrow streets, the rear wheels turn in direction Contrary to the front. Effect is that the turning circle is reduced to 10.7 meters (-0.5 meters). So that a Porsche 911 equipped with this system is able to rotate completely in closer than a Porsche 911 without directional rear axle half meter space. There is a gain that will make a difference, but in a sport with a steering ratio that is definitely not meant for browsing, any help is little when what is involved is to make us more comfortable life.
At speeds above 80 km / h , for example in a mountain pass, the rear wheels turn in the same direction as the front. Effect is virtually extend the battle of our car, increase stability and make changes direction quicker and fluids. Although we have had occasion to test this system in sports as the Porsche 911 GT3 , frankly we could not assure you that the difference between the handling of a sports car with directional rear axle, or not, is so important, because either We have had occasion to test a 911 GT3 without it. But needless to say, and more with its price, which can be an interesting extra for anyone looking for a Porsche 911 even more agile, and a little more versatile for day to day.
Gallery : 911 2016 Porsche, all you have to know in 7 Keys: biturbo engines arrive !
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