New GT3 991 revealed in Geneva Motorshow
#33
03-04-2013 | 02:55 PM
Teamspeed Pro
Joined: Jun 2009
Posts: 2,011
Official Press Release:
Porsche celebrates the 50th anniversary of the 911 with a new GT3
Stuttgart. The sportiest 911 will have its world premiere at the Geneva International Motor Show: the new Porsche 911 GT3. In the 50th anniversary year of the 911, Porsche is now set to open a new chapter in race track performance sports cars. The fifth generation of the 911 GT3, a complete new development, will take the pole position among the thoroughbred Porsche sports cars with naturally aspirated engines. Boxer engine and transmission, as well as body and chassis are completely new and constitute a further development of the 911 GT3 concept with an impressive performance leap. Power: 475 hp. Power to weight ratio: 3.0 kg/hp. Acceleration from zero to 100 km/h: in 3.5 seconds. Top speed: 315 km/h. Lap time Nürburgring Nordschleife: under 7:30 minutes. As a technical highlight, it features the first active rear wheel steering in a production Porsche. As well as the optional full LED headlights. The new 911 GT3 keeps all the successful properties of a sports car suitable for racing, with even more driving dynamics, more sophisticated practicality - and a highly emotional fun factor.
The powertrain of the new 911 GT3 is composed of a 3.8-liter boxer engine yielding 475 hp (350 kW) at 8.250 rpm, a Porsche dual-clutch transmission (PDK) and a high-traction rear-wheel drive. The six-cylinder engine is based on the same engine as the 911 Carrera S, although they share only few common parts. All other components, particularly the crankshaft and valve gear, were specially adapted or designed for the GT3. For instance, Porsche designed titanium connecting rods and forged pistons. The basic modifications set the stage for an extremely high-speed engine that reaches up to 9.000 rpm. The Porsche dual-clutch transmission was also specially developed; the characteristics are directly based on a sequential gearbox from motor racing, thereby providing further performance and dynamics advantages to the driver.
For the first time, Porsche is using active rear wheel steering in order to achieve even higher precision and lateral dynamics. Depending on the speed, it steers in the same or opposite direction of the front wheels, improving stability and agility. Other new modules improving driving dynamics are the electronically controlled, fully variable rear differential lock, and the dynamic engine mounts. The newly developed all-aluminium chassis can still be adjusted by height, toe and camber. Contact with the road is made by the new 20-inch forged alloy wheels with central locking.
The 911 GT3 is based on the light, yet stuff body of the current generation 911 Carrera in hybrid steel-aluminium construction, however, it comes with independent front and rear parts. In addition, the 911 GT3 is 44 millimetres wider than a 911 Carrera S in the area of the rear axle. Another clear recognition feature is again the large, fixed rear wing. This makes a decisive contribution to the exemplary aerodynamics of the new 911 GT3, which combines low air resistance with even more power.
As a result, the new 911 GT3 sets new performance records. At full acceleration from standstill, the 100 km/h mark is breached after 3.5 seconds, and 200 km/h are reached in less than twelve seconds. The top speed is 315 km/h in the seventh, top gear of the completely newly adapted PDK transmission. The lap time on the Nürburgring Nordschleife, which the new 911 GT3 manages in under 7:30 minutes, is even more impressive.
The new Porsche 911 GT3 will be launched on the market from August 2013 on, and will cost in Germany 137,303 Euro including VAT and national specifications.
Porsche celebrates the 50th anniversary of the 911 with a new GT3
Stuttgart. The sportiest 911 will have its world premiere at the Geneva International Motor Show: the new Porsche 911 GT3. In the 50th anniversary year of the 911, Porsche is now set to open a new chapter in race track performance sports cars. The fifth generation of the 911 GT3, a complete new development, will take the pole position among the thoroughbred Porsche sports cars with naturally aspirated engines. Boxer engine and transmission, as well as body and chassis are completely new and constitute a further development of the 911 GT3 concept with an impressive performance leap. Power: 475 hp. Power to weight ratio: 3.0 kg/hp. Acceleration from zero to 100 km/h: in 3.5 seconds. Top speed: 315 km/h. Lap time Nürburgring Nordschleife: under 7:30 minutes. As a technical highlight, it features the first active rear wheel steering in a production Porsche. As well as the optional full LED headlights. The new 911 GT3 keeps all the successful properties of a sports car suitable for racing, with even more driving dynamics, more sophisticated practicality - and a highly emotional fun factor.
The powertrain of the new 911 GT3 is composed of a 3.8-liter boxer engine yielding 475 hp (350 kW) at 8.250 rpm, a Porsche dual-clutch transmission (PDK) and a high-traction rear-wheel drive. The six-cylinder engine is based on the same engine as the 911 Carrera S, although they share only few common parts. All other components, particularly the crankshaft and valve gear, were specially adapted or designed for the GT3. For instance, Porsche designed titanium connecting rods and forged pistons. The basic modifications set the stage for an extremely high-speed engine that reaches up to 9.000 rpm. The Porsche dual-clutch transmission was also specially developed; the characteristics are directly based on a sequential gearbox from motor racing, thereby providing further performance and dynamics advantages to the driver.
For the first time, Porsche is using active rear wheel steering in order to achieve even higher precision and lateral dynamics. Depending on the speed, it steers in the same or opposite direction of the front wheels, improving stability and agility. Other new modules improving driving dynamics are the electronically controlled, fully variable rear differential lock, and the dynamic engine mounts. The newly developed all-aluminium chassis can still be adjusted by height, toe and camber. Contact with the road is made by the new 20-inch forged alloy wheels with central locking.
The 911 GT3 is based on the light, yet stuff body of the current generation 911 Carrera in hybrid steel-aluminium construction, however, it comes with independent front and rear parts. In addition, the 911 GT3 is 44 millimetres wider than a 911 Carrera S in the area of the rear axle. Another clear recognition feature is again the large, fixed rear wing. This makes a decisive contribution to the exemplary aerodynamics of the new 911 GT3, which combines low air resistance with even more power.
As a result, the new 911 GT3 sets new performance records. At full acceleration from standstill, the 100 km/h mark is breached after 3.5 seconds, and 200 km/h are reached in less than twelve seconds. The top speed is 315 km/h in the seventh, top gear of the completely newly adapted PDK transmission. The lap time on the Nürburgring Nordschleife, which the new 911 GT3 manages in under 7:30 minutes, is even more impressive.
The new Porsche 911 GT3 will be launched on the market from August 2013 on, and will cost in Germany 137,303 Euro including VAT and national specifications.
#35
03-04-2013 | 03:00 PM
Teamspeed Senior Member
Joined: May 2010
Posts: 307
From: California
For those interested in the PDK:
"Two modes are available to the driver: manual shifting or the adaptive shift programme. Manual shifting is achieved using two paddles on the steering wheel, the left-hand for upshifts and the right-hand for downshifts. Shorter shifting travel and optimised actuating force result in even faster gearshifts with concise feedback, similar to the operating characteristics of the 911 GT3 Cup race car. Alternatively, the driver can also shift using the selector lever, with a shift pattern based on that used in professional motor sports: shifting up is done by pulling the lever back, shifting down by pushing it forward.
Ready for the racetrack: ‘lightning shifts’ with extremely short reaction and gearshift times
Gear-shifting strategy and response times of the 911 GT3 PDK have been consistently designed for maximum performance, and both are fundamentally different to other Porsche sports cars. This becomes apparent to the driver during manual upshifts in the form of a ‘lightning shift’, which permits reaction times of less than 100 milliseconds. To enhance driving performance, lightning shifts are implemented with a torque overshoot, and the gear change is conducted with a highly dynamic adaptation of the engine speed to the newly selected gear. The switching times are in a range that was previously reserved for the world of motor sports.
Paddle-neutral: the de-clutching function of the 911 GT3 PDK
The dynamics of a sports car driven to achieve optimum lap times is also determined by the clutch. That is why the PDK comes with a ‘paddle-neutral’ feature. If the driver pulls both shift paddles simultaneously, the clutches of the PDK are opened, and the flow of power between the engine and drive is cut off. Once both shift paddles are released, the clutch engages very rapidly if the PSM is switched off. With PSM switched on, the clutch is closed quickly, but in a less pulsed manner.
This function offers two principal advantages: the driver can, for example, neutralise the driving behaviour of the vehicle when understeering in a wet curve by pulling the paddles, and thus ‘dip the clutch’ and re-direct additional cornering force to the wheels of the front axle.
The second aspect relates to individual influence of the driving dynamics due to the pulsed onset of the driving force when engaging the clutch. Comparable to a traditional clutch with a manual transmission, the rear of the vehicle can be consciously destabilised for dynamic leaning into the curve. Furthermore, the driver can use the paddle-neutral for accelerating from a standstill. As is the case with manual transmission vehicles, the driver alone decides on how to accelerate using clutch and accelerator foot, without any assistance from drive and dynamic handling control systems."
"Two modes are available to the driver: manual shifting or the adaptive shift programme. Manual shifting is achieved using two paddles on the steering wheel, the left-hand for upshifts and the right-hand for downshifts. Shorter shifting travel and optimised actuating force result in even faster gearshifts with concise feedback, similar to the operating characteristics of the 911 GT3 Cup race car. Alternatively, the driver can also shift using the selector lever, with a shift pattern based on that used in professional motor sports: shifting up is done by pulling the lever back, shifting down by pushing it forward.
Ready for the racetrack: ‘lightning shifts’ with extremely short reaction and gearshift times
Gear-shifting strategy and response times of the 911 GT3 PDK have been consistently designed for maximum performance, and both are fundamentally different to other Porsche sports cars. This becomes apparent to the driver during manual upshifts in the form of a ‘lightning shift’, which permits reaction times of less than 100 milliseconds. To enhance driving performance, lightning shifts are implemented with a torque overshoot, and the gear change is conducted with a highly dynamic adaptation of the engine speed to the newly selected gear. The switching times are in a range that was previously reserved for the world of motor sports.
Paddle-neutral: the de-clutching function of the 911 GT3 PDK
The dynamics of a sports car driven to achieve optimum lap times is also determined by the clutch. That is why the PDK comes with a ‘paddle-neutral’ feature. If the driver pulls both shift paddles simultaneously, the clutches of the PDK are opened, and the flow of power between the engine and drive is cut off. Once both shift paddles are released, the clutch engages very rapidly if the PSM is switched off. With PSM switched on, the clutch is closed quickly, but in a less pulsed manner.
This function offers two principal advantages: the driver can, for example, neutralise the driving behaviour of the vehicle when understeering in a wet curve by pulling the paddles, and thus ‘dip the clutch’ and re-direct additional cornering force to the wheels of the front axle.
The second aspect relates to individual influence of the driving dynamics due to the pulsed onset of the driving force when engaging the clutch. Comparable to a traditional clutch with a manual transmission, the rear of the vehicle can be consciously destabilised for dynamic leaning into the curve. Furthermore, the driver can use the paddle-neutral for accelerating from a standstill. As is the case with manual transmission vehicles, the driver alone decides on how to accelerate using clutch and accelerator foot, without any assistance from drive and dynamic handling control systems."
