Реферат: Porsche Essay Research Paper I have narrowed
911
The most popular Porsche ever…
912
A cheaper, more fuel efficient 911, built from 1965 to 1969 with a limited edition in 1976.
944
The “Evolution” of the 924.
959
The ULTIMATE Porsche…
968
The “Evolution” of the 944.
Boxster
The newest addition to the family. The first all new Porsche in 19 years
News & current events
The Porsche 911 GT3 hits the streets in May 1999
Super sporting vehicle with impressive performance data
Dr. Ing. h. c. F. Porsche A.G. Stuttgart is extending the 911 model range in May 1999 with a particularly sporty version: the 911 GT3 has 360 HP and accelerates from 0 to 100 km/h in 4.8 seconds. These performance data will set new standards, and at the same time are documented proof of the hidden potential of the 911 Carrera design. The 911 GT3 is the legitimate successor of the ”RS” model.
The Porsche motor sport engineers have increased the cubic capacity of the water-cooled engine from 3.4 to 3.6 liters. Thanks to numerous modifications and the use of components from the GT1 power unit as well as the transmission of the 911 GT2, the 911 GT3 has 360 HP. The maximum torque is 370 Nm at 5,000 revolutions per minute.
This performance, an increase of 20 per cent on the 911 Carrera, leads to remarkable performance data that are clearly above those of the current 300 HP Carrera. The 911 GT3 sprints from 0 to 200 km/h in 15.8 seconds (911 RS ”993” 17.8 seconds) and requires only 6.7 seconds for an acceleration from 80 to 120 km/h.
Of course, Porsche has adapted the brake system and the entire running gear to match this high performance. As a result, the 911 GT3 has even better handling properties and high active safety.
Identifying features of the 911 GT3 include a new front end, tasteful side sills, a fixed rear wing, red brake calipers and new 18-inch Sport Design wheels. The GT3 is 30 mm lower than the 911 Carrera.
The new 911 GT3, which forms the basis for homologation for use in motor sport, will be presented to the public for the first time at the Geneva Automobile Salon in March 1999. The first road vehicles will be delivered in Europe from mid-May onwards.
The Carrera 4 (The real news about Porsche)
Perfect Four-Wheel Drive for a Sports Car.The Carrera 4 continues the successful tradition of four-wheel-drive Porsche 911 models. Its drive technology is a further development of Porsche’s proven and highly successful concept, the entire process of developing the new Carrara 4 once again confirming the experience that the best way to divide power between the two axles on a rear-engine sports car is with a viscous clutch. A viscous clutch is a fully encapsulated multiple-plate unit filled with highly viscous silicone fluid. Part of this multiple-plate clutch unit is connected directly to the rear-wheel drive, the other section is connected with the front axle. Whenever wheel slip results in a difference in speed between the axles there is also slip between the plates within the viscous clutch. In that case, depending on the degree of slip, drive power is transmitted to the front axle by the viscous silicon fluid. Short Propeller Shaft Within the Frame Tunnel. A number of fundamental modifications have been introduced between the gearbox and the front axle in the process of changing over to the new model: The first point is that the drive shaft no longer runs through a rigid tube as with the transaxle principle. Instead, the new Carrera 4 features a short propeller shaft running freely within the frame tunnel. The first advantage is that this solution is about 4 kilos lighter, the second point is that it provides space for the coolant pipes now running through the tunnel for the water-cooled flat-six power unit.
Yet a further point is that the viscous clutch is no longer within the transmission itself, as it was in the past. Rather, it is now housed on the 911 Carrera 4 in the front differential casing moved far back to the rear of the car, a modification offering the big advantage that the larger differential housing and the viscous clutch apply a bit more weight on the front drive axle. This means even better front-to-rear weight distribution beneficial to the car’s driving characteristics and traction.
Four-wheel drive on the new Carrera 4 ensures that a certain amount of torque is always able to flow to the front wheels at all times. This share of power conveyed to the front varies from 5-40 per cent, depending directly on drive slip on the rear wheels.
Driving Behavior Even Better Than Before. The primary objective in this case is of course to perfect the characteristic driving behavior and the superior driving safety of the Porsche 911, thus reaching a higher standard than ever before. Four-wheel drive conveys the supreme power of the engine to the road even more smoothly and steadily than one drive axle.
Installing four-wheel drive in the floor pan of the Porsche 911 required a number of modifications. The first point is that various body components had to be modified in the region of the front axle in order to accommodate the front differential. This called for a new fuel tank shaped like a saddle and offering approximately the same volume as before. An inevitable result of the more sophisticated drive technology is a slight loss of space in the luggage compartment, which is however kept to a minimum by the folding wheel in flat arrangement on the floor. Luggage compartment capacity therefore remains adequate at 100 liters or 3.5 cu ft. And despite its more sophisticated technology the Carrera 4 remains a light and agile vehicle from the start, the coup? weighing in at 1375 kg or 3032 lb, which makes it only 55 kg or 121 lb heavier than its rear-wheel-drive Carrera counterpart.
Highlights of the Carrera 4
Permanent Four-Wheel Drive with Perfect Power Division. Benefitting from years of thorough experience with four-wheel drive systems, Porsche’s engineers have found a particularly effective solution with the Carrera 4: Variable distribution of drive forces to the front axle via a viscous clutch in the front differential guarantees excellent traction and supreme driving safety on all kinds of roads and under all weather conditions. Porsche Stability Management. The Carrera 4 is the first Porsche ever to feature PSM Porsche Stability Management, a highly sophisticated dynamic control concept serving to stabilize the car in an extreme situation by intervening in the engine management and brake system. Offering supreme stability in this way both in longitudinal and crosswise direction, PSM has been specially tuned to the typical requirements of a Porsche and the Porsche driver, ensuring that the sporting character of the car is not suppressed by premature intervention. The objective in this tuning process was therefore to offer brief but decisive driver support in conjunction with the four drive wheels whenever the car suddenly comes too close to the limits of physics.