Porsche Performance Buttons Transmission and Chassis Control Systems Your Porsche sports car features a complex integrated system made up of all control systems acting in power transmission and in the chassis. All control systems are networked with the aim of combining the best possible driving performance with maximum safety.

The following systems are involved, depending on equipment:

System/designation Scope PTM- Porsche Traction Management – Active all-wheel drive with electronically regulated map-controlled multi-plate clutch PSM- Porsche Stability Management – Driving stability control – Anti-lock brake system (ABS) – Brake system pre-filling – Brake booster (Hydraulic Brake Assist) – Automatic brake differential (ABD) – Anti-slip control (ASR) – Engine drag torque control (MSR) – Steering torque recommendation – HOLD function: Drive-Off Assistant on vehicles with manual transmission, standstill management on vehicles with PDK PASM- Porsche Active Suspension Management – Shock absorber system with adaptive, continuous shock absorber control PDCC- Porsche Dynamic Chassis Control – Active chassis control system to stabilize roll tendency of vehicle body when driving PTV- Porsche Torque Vectoring PTV Plus- Porsche Torque Vectoring Plus – Laterally dynamic braking intervention for more agile cornering – Rear differential lock with fixed asymmetrical locking ratio – Laterally dynamic braking intervention for more agile cornering – Fully-variable electronically controlled rear differential lock TC- Traction Control (GT series Cars) SC- Stability Control (GT series Cars)

  

Porsche Traction Management (PTM) Porsche Traction Management is an active all-wheel control system designed to influence longitudinal and lateral dynamics. It is closely linked with the Porsche Stability Management (PSM) system. The permanently driven rear axle enhances the vehicle’s sporty features. Drive power is distributed fully variably to the front axle, depending on the driving situation. In conjunction with PSM, the PTM system ensures perfect distribution of power among all four wheels in every driving situation. This improves traction and driving stability and ensures the same high level of agility and dynamic response. WARNING! Loss of control over the vehicle In spite of the advantages of PTM and four-wheel drive, it is still the driver’s responsibility to adapt his driving style and maneuvers in line with road and weather conditions, as well as the traffic situation. The increased safety that is provided should not induce you to take greater risks with your safety. The limits set by the physics of driving cannot be overcome, even with PTM or four-wheel drive. Risk of accidents due to inappropriate speed cannot be reduced by PTM or four-wheel drive. Advantages of PTM – Clearly perceptible improvement in traction, driving stability and steering ability of the vehicle. – Vehicle is more manageable when driven at its performance limits. – Improved straight-ahead tracking and greater stability. – More sporty vehicle setup while making full use of all the advantages of four-wheel drive. – ASR, ABD and PTV Plus further enhance traction for all wheels.

Porsche Stability Management (PSM) PSM is an active control system for stabilization of the vehicle during extreme driving maneuvers. PSM makes use of both the automatic brake differential (ABD) and anti-slip regulation (ASR) systems, as well as the functions of the anti-lock brake system (ABS) and engine drag torque control system (MSR). WARNING! Loss of control over the vehicle In spite of the advantages of PSM, it is still the driver’s responsibility to adapt his driving style and maneuvers in line with road and weather conditions, as well as the traffic situation. The increased safety that is provided should not induce you to take greater risks with your safety. The limits set by the physics of driving cannot be overcome, even with PSM. Risk of accidents due to inappropriate speed cannot be reduced by PSM. Advantages of PSM – Best possible traction and lane-holding ability in all driving situations – even on road surfaces with varying friction. – The system compensates for undesired vehicle reactions (Ferraria effect) when the driver releases the accelerator pedal or brakes on bends. This compensation functions up to the maximum lateral acceleration. – PSM actively helps to stabilize the vehicle if necessary during dynamic driving maneuvers (e.g. rapid steering movements, during lane changes, or on alternating bends). – Improved braking stability on bends and on different or varying road surfaces. – Improved brake function and shorter stopping distance in the event of emergency braking. Readiness for operation PSM is switched on automatically every time you start the engine. Function Sensors at the wheels, brakes, steering system and engine continuously measure: – Speed – Direction of travel (steering angle) – Lateral acceleration – Axial acceleration – Rate of turn about the vertical axis PSM uses these values to determine the direction of travel desired by the driver. PSM intervenes and corrects the course if the actual direction of motion deviates from the desired course (steering-wheel position): It brakes individual wheels as required. If necessary, PSM also influences the engine power or the gear-changing characteristic of Porsche Doppelkupplung (PDK) in order to stabilize the vehicle. The events below inform the driver of PSM control operations and warn him to adapt his driving style to the road conditions: – PSM warning light on the instrument panel flashes. – Hydraulic noises can be heard. – The vehicle decelerates and steering-wheel forces are altered as PSM controls the brakes. – Reduced engine power.

  

– The brake pedal pulsates and its position is changed during braking. In order to achieve full vehicle deceleration, foot pressure must be increased after the brake pedal has begun vibrating. Examples of PSM control operations – If the “front wheels of the vehicle drift” on a bend, the engine power is reduced and the rear wheel on the inside of the bend is braked if necessary. – If the rear of the vehicle swings out on a bend, the front wheel on the outside of the bend is braked. – Brake system pre-filling: The brake system is prepared for possible subsequent emergency braking if the accelerator pedal is released suddenly and quickly. The brake system is prefilled and the brake pads are already applied gently to the brake disks. – Brake booster (Hydraulic Brake Assist): In the event of an emergency braking operation where the pedal force is insufficient, a brake booster provides the braking pressure necessary for maximum deceleration at all 4 wheels. Press button for at least 1 second. PSM is switched off after a short delay. The indicator light on the button and the PSM OFF warning light on the instrument panel light up. The warning “PSM off” appears on the multi-function display in the instrument panel. When you brake in the ABS control range, the vehicle is stabilized even when PSM is switched off. One-sided spinning of the wheels is prevented, even with PSM switched off. WARNING! No PSM assistance: When PSM is switched off, PSM support is no longer provided in critical driving situations outside the ABS control range. PSM should always be switched on during “normal” driving.

  

Porsche Active Suspension Management (PASM) The PASM system actively adjusts the shock absorbers. The adjustable damper system selects the appropriate damping level for each wheel according to the driving situation and driving conditions. Driving safety, agility and comfort are optimized. Two different chassis setups can be selected at the push of a button: – “Chassis Normal” – “Chassis Sport” In Normal mode the vehicle is in a sporty and comfortable setup. Sport mode offers very sporty shock absorber tuning (e.g. for driving on the race circuit). In addition to manual mode selection, PASM also adjusts shock absorber tuning for either sporty or comfort driving, depending on the driving situation.

Selecting the PASM mode 1. Switch on ignition. 2. Press button (repeatedly). On the button: – No indicator light comes on when “Chassis Normal” is selected (default setting). – An indicator light comes on when “Chassis Sport” is selected. In addition, the selected chassis setup is shown on the multi-function display in the instrument panel for approx. 4 seconds.

  

Porsche Torque Vectoring (PTV)/(PTV Plus) Functional Description Vehicles with manual transmission: Porsche Torque Vectoring (PTV) PTV consists of a control system for driving dynamics relevant brake interventions enabling variable drive-torque distribution at the rear axle and a mechanical rear-axle differential lock. By using gentle braking interventions that are imperceptible to the driver at the rear wheel on the inside of the bend, PTV improves steering performance and steering precision. The vehicle follows the steering angle of the front wheels more precisely. Under-steer is largely prevented in the limit range. This increases the lateral acceleration potential and higher cornering speeds are possible. The mechanical rear-axle differential lock improves traction in the event of wheel spin. It reduces load alteration effects during rapid cornering and increases driving stability at higher speeds. Vehicles with Porsche Doppelkupplung: Porsche Torque Vectoring Plus (PTV Plus) PTV Plus consists of a control system that performs braking interventions based on driving dynamics to achieve variable drive torque distribution on the rear axle and of an electronically controlled rear differential lock. PTV Plus improves steering response and precision through gentle braking interventions on the inside rear wheel. This braking action cannot be felt by the driver. The vehicle follows the steering angle of the front wheels more precisely. Under-steer is largely prevented in the limit range. This increases the lateral acceleration potential and higher cornering speeds are possible. The electronically controlled rear differential lock continuously monitors the driving condition of the vehicle and distributes the drive torque to the rear axle as required. This has the following advantages: – Improved traction. – Reduced load change responses when cornering at speed. – Improved driving stability at higher speeds. PTV Plus changes to a more dynamic map when “Sport Plus” is switched on. Porsche Dynamic Chassis Control (PDCC) Porsche Dynamic Chassis Control (PDCC) is a system for roll stabilization of the vehicle body when driving. Driving comfort and driving safety are improved by active intervention of the anti-roll bars on the front and rear axles. Vehicle balance and agility are optimized. No separate controls are available for the PDCC system. When you select a chassis setup in Porsche Active Suspension Management (PASM) the PDCC system automatically activates the corresponding on-road driving program

Dynamic Engine Mounting (PADM) On vehicles with Sport Chrono Plus package Dynamic Engine Mounting with variable damping is a system designed to enhance both driving dynamics and driving comfort. Depending on the driving situation, the ideal mounting rigidity and damping is automatically set in the range between an rigid engine-to-body connection (increase in driving dynamics) and decoupling of the engine from the body (increase in driving comfort). “Sport” mode When “Sport” mode is switched on, a more rigid engine-to-body connection is achieved for a sporty driving style. “Sport Plus” mode When “Sport Plus” mode is switched on, an optimal engine-to-body connection is achieved for driving on race circuits.

  

“Sport” and “Sport Plus” mode The selectable chassis settings mean that the vehicle can offer various modes for a sportier overall setup. The “Sport” mode pushes the control systems more in the direction of greater emotionality and performance during everyday driving. In “Sport Plus” mode, maximum performance is set for race-circuit-like driving: – In “Sport Plus” mode: PASM (Porsche Active Suspension Management) is automatically changed to “Chassis Normal” or “Chassis Sport” mode. – In “Sport Plus” mode: Like PASM, PDCC is switched to the corresponding “Sport” mode, whereby the rolling movements of the vehicle are reduced further, depending on the selected mode. – The PDK transmission switches to a sporty gear-changing map and shortens the gear shifting times when Sport mode is activated. Gear changes take place faster. – The electronic accelerator pedal reacts sooner, and the engine is more responsive to throttle inputs. When Sport mode is switched on and the vehicle is travelling at a speed of less than 40 km/h (25 mph), this function is activated only after the driver has floored the accelerator pedal or released it briefly. – The rpm limiter characteristic is “harder”. In other words: the engine is immediately throttled when the performance limits are reached (only in manual selection mode on vehicles with PDK). – PSM (Porsche Stability Management) control is more sporty in “Sport Plus” mode. PSM interventions are later than in Normal mode. The driver can maneuver the vehicle with greater agility at its performance limits, without having to dispense with the assistance of PSM in emergency situations. This helps to achieve optimal lap times, particularly on race circuits with a dry road surface. – PADM changes to more sporty maps for the dynamic engine mountings to achieve a stiffer engine-to-body connection. In “Sport” for a sporty driving style, in “Sport Plus” mode for race-circuit-like driving. – PTV Plus changes to a more dynamic map when “Sport Plus” is switched on. – The dynamic cornering light reacts more spontaneously to steering angle changes. – The sports exhaust system is be switched to a sound-optimized mode, but can be switched off separately via the button. The Auto Start Stop function and coasting mode are deactivated.

Switching “Sport” mode on and off Press button . When “Sport” mode is switched on, the indicator light on the button lights up. The word “SPORT” appears on the digital speedometer or on the steering wheel, depending on vehicle equipment. A sporty gear-changing map is enabled and the gear shifting times are shorter for the PDK transmission. A sporty driving style is recognized more quickly and the gear-changing speeds are adapted to driving performance. Braking downshifts are initiated earlier. Downshifts occur for small decelerations, even at higher revs.

  

Switching “Sport Plus” mode on and off Press button . When “Sport Plus” mode is switched on, the indicator light on the button lights up. The words “SPORT PLUS” appear on the digital speedometer or on the steering wheel, depending on vehicle equipment. In “Sport Plus” mode, the PDK transmission changes to a shift program designed for driving on race circuits. 7th gear is not selected. “Sport Plus” and “PASM Chassis Sport” modes Switching “Sport Plus” mode on and off simultaneously activates and deactivates the “PASM Sport” mode. Switching “Sport” mode has no influence on the PASM mode. The PASM mode can be switched manually if you want to use the characteristics of “Sport” or “Sport Plus” mode, but prefer a more comfortable chassis setup. Press button (repeatedly). The indicator light for the selected chassis setup on the button lights up. Traction Control (TC) TC counteracts the spinning of the driven wheels when moving off and accelerating. Driving stability and traction are improved over the entire speed range. WARNING: Risk of an accident, resulting in serious personal injury or death. The increased control that is provided should not induce you to take greater risks with your safety. The limits dictated by the laws of physics cannot be overcome, even with TC. The risk of accidents due to inappropriate speed cannot be reduced, even by TC. The driver bears the responsibility for all driving maneuvers. -Adapt your driving style to the prevailing road and weather conditions. -Obey all traffic laws. Readiness for operation: TC is switched on automatically every time you start the engine. Function: Engine torque control When the wheel rotation speed of the front and rear axles differs by more than a specified value (spinning), this is detected by TC and engine output is automatically reduced. Brake control In addition to reducing engine power, TC brakes the spinning drive wheels. The events below inform the driver of TC control operations and warn him to adapt his/her driving style to the road conditions: – TC multifunction light in the instrument panel flashes, – Hydraulic noises can be heard, – Reduced engine power. Switching off Traction Control: Press TC OFF button. TC is switched off after a short delay. With TC switched off, the TC multifunction light on the instrument panel lights up. TC is not active in emergency situations either. Note on operation: TC cannot be switched off during a controlled braking process (TC multifunction light flashes). The TC should always be switched on during ”normal“ driving. This is particularly the case when the road is wet. However, it can be of advantage to switch off TC temporarily in exceptional situations: – On a loose surface or in deep snow, – When ”rocking“ the vehicle free, – When using snow chains. Switching on Traction Control again Press TC OFF button. TC is switched on after a short delay. Note on operation TC cannot be switched on again during a controlled braking process.

  

Stability Control (SC) Switching off Stability Control (SC) Precondition: The light-emitting diode in the SC+TC OFF button must be off. Press SC OFF button. Stability Control is switched off after a short delay. The light-emitting diode in the button is lit up. When the system is switched off, the multifunctional PSM light on the instrument panel is lit and the message “SC OFF” appears continuously on the on-board computer. An acoustic signal also sounds. – When Stability Control is switched off, sportier Traction Control is activated. – Brake control is deactivated. – The ABS remains active. Switching Stability Control (SC) back on: Press SC OFF button. Stability Control is switched on after a short delay. The light-emitting diode in the button and the multi-functional PSM light on the instrument panel go out. The on-board computer shows a message. Switching off Stability Control (SC) and Traction Control (TC) Press SC+TC OFF button. Stability Control and Traction Control switch off completely after a short delay. The light-emitting diode in the button is lit up. When the system is switched off, the multifunctional PSM light on the instrument panel is lit and the message “SC+TC OFF” appears continuously on the on-board computer. A gong signal also sounds. Push the on-board computer lever forward to acknowledge the additional message under the digital speedometer. – All PSM functions are deactivated. – The ABS remains active.

  

Dynamic engine mounts

You don’t have to take the 991/981 onto the racetrack. But you can, more so than ever, because dynamic engine mounts are now included as part of the Sport Chrono Package.

The electronically controlled system minimizes the oscillations and vibrations of the entire drivetrain, especially the engine, and combines the benefits of a hard or soft engine mounting arrangement.

A hard engine mounting delivers optimum dynamic performance because it offers the highest degree of handling precision possible. Soft engine mounts, on the other hand, minimize oscillations and vibrations. While comfort is improved on uneven road surfaces, this comes at the expense of dynamic performance.

Our engineers have solved this problem by enabling the engine mounts to adapt their stiffness and damping properties to changes in driving style and road surface conditions. This has been achieved by use of a fluid with magnetic properties in interaction with an electrically generated field. For the driver, the results are tangible. Handling is perceptibly more stable under load change conditions and in fast corners. Whenever a less assertive driving style is adopted, the dynamic engine mounts provide a higher level of comfort.

 

 

 

  

Porsche Torque Vectoring Plus (PTV Plus)

PTV in conjunction with the manual gearbox, or PTV Plus with Porsche Doppelkupplung (PDK), are available as options for the 991/981 models and standard in the S models. Both systems actively enhance vehicle dynamics and stability. Operating in conjunction with a mechanical (PTV) or electronic (PTV Plus) rear differential lock, they work by intelligently braking the rear wheels as the situation demands.

As a function of steering angle and steering speed, accelerator pedal position, yaw rate and vehicle speed, PTV and PTV Plus are able to improve steering response and steering precision by specific braking of the right or left rear wheel.

To be more precise, this means that when the car is driven assertively into a corner, moderate brake pressure is applied to the inside rear wheel. Consequently, a greater amount of drive force is distributed to the outside rear wheel, inducing an additional rotational pulse (yaw movement) around the vehicle’s vertical axis. This results in a direct and sporty steering action as the car enters the corner.

At low and medium vehicle speeds, PTV and PTV Plus significantly increase agility and steering precision. At high speeds and when accelerating out of corners, the rear differential lock ensures greater driving stability. With PTV, the differential lock is regulated mechanically; with PTV Plus, it is regulated electronically and the torque distribution is infinitely variable. Whichever system is fitted, it interacts with Porsche Stability Management (PSM) to improve driving stability on a range of surface conditions, including the wet and snow.

For the driver, this means remarkable stability, easier handling and outstanding traction as well as greater agility at every speed with precise steering and stable load transfer characteristics. What else? Unrivalled driving pleasure at every twist and turn.

  

Sport Chrono Package

SPORT button 

Fitted as standard, the SPORT button enables you to select a suspension setup where the emphasis is on either comfort or sporty performance. At the push of a button, the electronic engine management system switches the engine mapping to offer an even sharper response and engine dynamics that are more direct.

In vehicles with Porsche Doppelkupplung (PDK), up-shifts take place at higher engine speeds and downshifts happen sooner. In addition, coasting mode and the auto start/stop function are automatically deactivated. If fitted, the optional sports exhaust system is also activated automatically.

Sport Chrono Package 

The Sport Chrono Package including dynamic engine mounts is available as an option. This integrated system provides simultaneous enhancement for the chassis, engine and transmission. Included in the package are a performance display, a digital and an analogue stopwatch and the SPORT PLUS button. An additional display in the steering wheel and instrument cluster indicates whether the SPORT buttons and Launch Control have been activated.

On activation of SPORT PLUS mode, Porsche Active Suspension Management (PASM) and, in the 991/981 S models, optional Porsche Dynamic Chassis Control (PDCC) switch to a harder damping setting and offer more direct steering and, therefore, better road-holding.

In SPORT PLUS mode, the trigger threshold for PSM is raised. Agility is perceptibly enhanced when braking for corners with PSM, allowing sportier braking and exit acceleration. For even greater dexterity, PSM can be set to standby while the car is still in SPORT PLUS mode. For safety, it is set to intervene automatically only when ABS assistance is required on both the front wheels.

In combination with PDK, the Sport Chrono Package has two additional functions for a sporty drive that borders on a motorsport experience. The first is ‘Launch Control’, which can be used on the track to achieve the best possible standing start – a racing start.

The second function is the ‘motorsport-derived gearshift strategy’. Using this, Porsche Doppelkupplung (PDK) is geared up for extremely short shift times and optimum shift points for the maximum acceleration available. This combination of uncompromising and involving performance is ideal for the racetrack.

A key component of the Sport Chrono Package is the stopwatch mounted on the dashboard. In conjunction with optional PCM, a special performance display enables you to view, store and evaluate lap times or other driving times. It shows the total driving time, lap distance, lap number and lap times recorded so far.

  

A feature of the Sport Chrono Package borrowed from motorsport is the dynamic engine mounts. These exploit the laws of physics for your own driving pleasure.

 

 

 

 

 

 

 

 

 

 

 

  

Porsche Active Suspension Management (PASM)

PASM, the electronic damping control system, is standard in the 991/981 S models and available as an option for the 991/981 models. It actively and continuously regulates damping forces according to driving style and road conditions. In addition, the suspension is lowered by 10 mm.

PASM has two modes, which can be selected using a separate button on the centre console: ‘Normal’, which is a blend of performance and comfort, and ‘Sport’ where the setup is much firmer.

To ensure efficient control interventions, a multitude of sensors in the 991/981 record the body movements that accompany powerful acceleration, braking or uneven road surfaces. The PASM control unit evaluates the driving conditions and modifies the damping force on each of the wheels in accordance with the selected mode.

In ‘Sport’ mode, the suspension is set to a harder damper rating. On uneven roads, PASM immediately switches to a softer rating, thereby improving contact between the wheels and the road. When the road surface improves, PASM automatically reverts to the original, harder rating. If ‘Normal’ mode is selected and the driver’s style becomes more assertive, PASM automatically switches to a harder rating. Damping firms up, and driving stability and road safety are increased.

The results are tangible: increased driving stability, improved comfort and enhanced performance.

PASM sports suspension 

The PASM sports suspension is available as an option for the 991/981 models in conjunction with 20-inch wheels and Porsche Torque Vectoring (PTV) or Porsche Torque Vectoring Plus (PTV Plus).

The ride height is 20 mm lower than with the standard suspension or 10 mm compared with the PASM suspension. The springs are harder and shorter, and the anti-roll bars on the front and rear axles are stiffer. The front spoiler lip has a more sporty geometry, the rear spoiler extends even further. These not only further reduce lift at the front axle, but also provide down-force at the rear axle for improved aerodynamics and even better performance.

 

 

 

 

  

Porsche Dynamic Chassis Control (PDCC)

It’s easy, and even makes sense, to carry on in your usual way, but what happens if a sudden change of direction leaves you thrown off course? Then, it all comes down to personal strength.

A Porsche has a clear sense of purpose and is the embodiment of strength. It demonstrates this with sporty and precise handling and excellent road-holding.

With the optional Porsche Dynamic Chassis Control (PDCC) for the S models of the 991/981, these characteristics can be further accentuated: the vehicle holds the road even better and delivers even sportier performance.

PDCC is an active anti-roll system that suppresses lateral body movement during cornering maneuvers. In addition, it minimizes the lateral instability of the vehicle on uneven ground.

This effect is achieved with the aid of hydraulic stabilizing actuators in the form of cylinders designed to optimize camber. Lateral roll is counteracted by forces generated at each individual wheel, based on steering angle and lateral acceleration.

The results are improved dynamic performance and increased ride comfort at all speeds, as well as optimized turn-in and stable load transfer characteristics.

In simple terms, the tires and vehicle hold the road better and you can steer through corners faster and in a more relaxed manner.

PDCC sets standards for handling performance, ride comfort and driving pleasure. In the 991/981, your ‘usual’ way suddenly becomes the Porsche way.

 

 

 

 

 

 

 

 

 

 

  

TPM

Tire Pressure Monitoring (TPM/TPC) 

Integrated as standard, Tire Pressure Monitoring (TPM) sends warnings to the on-board computer’s display screen in the event of low tire pressure or a gradual or sudden loss of pressure. The individual pressures in all four tires can be displayed in the instrument cluster.

TPC Tire Pressure Monitoring: The Tire Pressure Monitoring continuously monitors tire pressure and tire temperature on all four wheels and warns the driver when the tire pressure is too low. The display as well as the settings for the Tire Pressure Monitoring take place on the on-board computer. However, you must still adjust the tire pressure on the wheel. The driver is responsible for filling the tires correctly and making the correct settings on the on-board computer. The Tire Pressure Monitoring offers the following functions: – Display of the actual tire pressure while the vehicle is in motion – Display of the deviation from the required pressure (refilling pressure) – Display of currently set tire type – Tire pressure warnings in two stages Safety Notes: Despite the advantages offered by the Tire Pressure Monitoring, it is still the driver’s responsibility to update the corresponding settings in the on-board computer and maintain the pressure in the tires. Low tire pressure reduces the road safety of the vehicle and destroys the tire and wheel. When a flat tire has been displayed, immediately stop in a suitable place and check the tires for damage. If necessary, remedy the damage with a tire sealant. Do not by any means continue to drive with damaged tires. Sealing the tire with tire sealant is only an emergency repair, so you can drive to the next authorized Porsche dealer. The maximum permitted speed is 50 mph (80 km/h). Do not drive with tires whose tire pressure drops again in a short period of time. In cases of doubt, have tires checked by an authorized Porsche dealer. Damaged tires must be immediately replaced by an authorized Porsche dealer. Tire repairs are not permissible under any circumstances.

  

Front and rear axles

The independent suspension at the front features a lightweight spring-strut axle with longitudinal and transverse links and cross members that have been refined for stiffness. Each front wheel is precisely located, ensuring excellent directional stability, superior handling and reduced pitching under braking, and the wide track optimizes turn-in. The rear axle is equipped with a motorsport-derived multi-link suspension and chassis sub-frame. Refined axle kinematics for improved longitudinal damping reduce acceleration squat and increase comfort. Lightweight spring struts further enhance agility. The high proportion of aluminum used in the construction of the axles reduces the weight of the vehicle and of the un-sprung masses, helping to improve fuel economy, comfort and agility.

Brakes

Another crucial piece of the Porsche identity is the brakes. We value them as highly as we do our engines and chassis. They set standards for deceleration and stability, and give the driver the reassurance needed to push the car to the limits of its performance.

The 991/981 base models are fitted front and rear with anodized black four-piston aluminum mono-bloc fixed calipers.

On the S models, we have fitted larger brakes and more brake pistons to cope with the higher engine power of these models. Consequently, they feature red six-piston mono-bloc aluminum fixed brake calipers at the front and four-piston aluminum mono-bloc fixed calipers at the rear.

On all models, the brake calipers have an enclosed mono-bloc construction. This makes them tougher but lighter and enables a more rapid response and release of the brake even under extreme loads. The pedal travel is short and the biting point precise. The brake discs are cross-drilled for better performance in the wet.

Other benefits of the standard braking system include the anti-lock braking system (ABS), designed to keep deceleration constant. Pedal effort is reduced and braking response improved by an 8-/9-inch tandem vacuum brake booster. In the S models, brake disc cooling is further enhanced by the inclusion of air spoilers.

Electric parking brake 

The electric parking brake, which you can activate and deactivate manually, releases automatically as you pull away. With the hill-hold function, you can pull away without ever rolling back. The system automatically detects when the vehicle has come to a halt on an uphill gradient requiring intervention. PSM then maintains the brake pressure at all four wheels to prevent the vehicle from moving in the opposite direction.

 

  

Porsche Ceramic Composite Brake (PCCB)

From the start, Porsche has been synonymous with motorsport. Ever since 1948, when we found our identity on the racetrack, we have taken the experience we have gained and transferred it to the road. The optional Porsche Ceramic Composite Brake (PCCB) is a fine example. This brake system has already had to cope with the harshest requirements of motor racing and is fitted in cars that compete in demanding events, such as the Porsche Mobil 1 Supercup. The cross-drilled PCCB ceramic brake discs for the 911 Carrera have a diameter of 350 mm front and rear for even more formidable braking performance.

The use of six-piston aluminum mono-bloc fixed brake calipers on the front axle and four-piston units at the rear – all finished in yellow – ensures extremely high brake forces which, crucially, are exceptionally consistent.

PCCB enables shorter braking distances in even the toughest road and race conditions. The key advantage of PCCB is the extremely low weight of the ceramic brake discs, which are approximately 50% lighter than standard discs of similar design and size.

As well as enhancing performance and fuel economy, this represents a major reduction in un-sprung and rotating masses.

The consequence is better road-holding and increased comfort, particularly on uneven roads, as well as greater agility and improved handling. The demands of racetrack use mean that additional maintenance tasks will be required alongside the routine maintenance work scheduled as part of standard maintenance intervals.

  

Porsche Stability Management (PSM)

As standard, the 991/981 models are equipped with enhanced Porsche Stability Management (PSM), which maintains stability even at the limits of dynamic driving performance. Sensors continuously monitor the direction, speed, yaw velocity and lateral acceleration of the car. Using this information, PSM is able to calculate the actual direction of travel at any given moment. If the car begins to over-steer or under-steer, PSM applies selective braking on individual wheels to restore stability.

Under acceleration on wet or low-grip road surfaces, PSM improves traction using the automatic brake differential (ABD) and anti-slip regulation (ASR). When the SPORT PLUS mode of the optional Sport Chrono Package is selected, the PSM threshold is raised to allow a sportier driving style.

For an even more dynamic experience, you always have the option to deactivate PSM. It is automatically reactivated, for your safety, only if you brake harder and either of the front wheels (in SPORT PLUS mode, both of the front wheels) requires ABS assistance. ABS and ABD, however, remain active at all times.

PSM therefore offers a high level of driving stability and safety combined with extraordinary agility. It’s an apparent contradiction in terms, but an intrinsic part of the Porsche identity

Airbags

The 991/981 models offer advanced airbag technology in the form of full-size driver and front passenger airbags, which are inflated in two stages depending on the severity and type of accident (e.g. frontal or offset frontal). In less serious accidents, the airbags are only partially inflated, thereby minimizing discomfort to the occupants.

In addition to the central airbag control unit on the transmission tunnel, a pair of impact sensors are located near the headlights. This allows a crash to be detected and evaluated not just sooner, but with even greater accuracy.

Porsche Side Impact Protection System (POSIP) 

Coupé or Cabriolet, the 991/981 models are equipped as standard with the Porsche Side Impact Protection System (POSIP). It comprises side impact protection elements in the doors and two airbags on each side. An integral thorax airbag is located in each seat side bolster, while the door panels each contain an upwards-inflating head airbag. Each thorax airbag has a volume of 10 litres and each head airbag 15 litres, ensuring excellent protection in the event of a side impact.

Cabriolet roll‐over protection concept 

Despite their low weight, the 991/981 Cabriolet models have exemplary torsion rigidity and flexural strength. Body flexing is minimal even on irregular road surfaces.

  

Increased protection is provided by an automatically deploying roll-over protection system if the car were to overturn. Two spring-loaded roll-over bars are neatly incorporated behind the rear seats. The roll-over sensor continuously monitors the car’s pitch and roll, contact with the road, as well as lateral and longitudinal forces. If the car were to overturn, the roll-over bars would be deployed instantly.

Porsche Doppelkupplung (PDK)

Available as an option for all 991/981 models is 7-speed PDK, featuring manual and automatic modes. It facilitates extremely fast gear changes with no interruption in the flow of power, whilst at the same time improving acceleration and fuel efficiency.

The first six gears are particularly sporty, with top speed being reached in 6th gear. 7th gear has a long ratio and reduces the revs – for lower consumption.

PDK is essentially two gearboxes in one and thus requires two clutches. This double-clutch arrangement provides an alternating, non-positive connection between the two half gearboxes and the engine by means of two separate input shafts.

The flow of power from the engine is transmitted through one half gearbox and one clutch at a time, while the next gear is preselected in the second half gearbox. During a gear change, therefore, one clutch simply opens and the other closes at the same time, enabling gear changes to take place within milliseconds.

The effect is instant. Driving feels even sportier and more dynamic, and agility is increased. Depending on the gearshift programme (SPORT button activated or deactivated), the gear change is optimized for comfort or for sporty driving.

With the optional Sport Chrono Package, PDK is enhanced by the ‘Launch Control’ and ‘motorsport-derived gearshift strategy’ functions.

 

 

 

 

 

 

 

 

  

Warnings on the instrument panel and the on-board computer (997/987) If a warning message appears, always refer to the corresponding chapters in the Owner’s Manual. Warning messages are issued only if all measurement preconditions are met. Therefore, check all fluid levels regularly – in particular, always check the engine oil level after refueling. 

 

 

  

 

 

 

  

 

 

 

 

  

Overview of Warning and Information Messages (991/981) If a warning message appears, always refer to the corresponding sections in this Owner’s Manual. Warning messages are issued only if all measurement prerequisites are met. Therefore, check all fluid levels regularly – in particular, always check the engine oil level before refueling.

 

 

 

 

  

 

 

  

 

 

  

 

  

 

 

 

 

 

 

 

 

*All information gathered from and available through Porsche Cars North America (http://www.porsche.com/usa/)