Loosely translated from the original German

The Porsche 911 Turbo is the first series-produced sports car in the world with an exhaust turbocharger and is synonymous with the highest performance and the finest automotive technology. Nevertheless, the top model in the 911 range not only shines with its enormous range of performance, but also pampers its drivers with luxury and comfort. The combination of these characteristics characterizes the charismatic sports car with high long-distance qualities.

Full load of high tech is available for the new Turbo generation, which will be launched internationally in April 1995. The following are particularly noteworthy:

• the 300 kW (408 hp) engine with two turbochargers;
• worldwide as standard the exhaust gas monitoring system, "on-board diagnostics";
• power transmission via a new six-speed gearbox and all-wheel drive;
• a new racing-ready braking system
• new wheel technology that enables aluminum wheels with hollow spoke technology;
• striking styling with improved aerodynamics and
• the highly effective Litronic (light electronic) dipped headlights, which are available in specific countries.

Two small turbochargers increase the dynamics

The new 911 Turbo engine is characterized by its great power and acceleration characteristics. It meets all exhaust gas and noise regulations worldwide and also has a permanent exhaust gas monitoring system for all relevant components, on-board diagnostics ll. It is the first biturbo engine with air mass control.

The six-cylinder boxer engine of the Porsche 911 Turbo is based on the air-cooled 3.6-liter engine of the 911 Carrera and, with two turbochargers, produces 300 kW (408 hp) at 5750 rpm. The increase in performance results in even better performance: the Turbo accelerates from zero to 100 kilometers in 4.5 seconds, and the top speed is 290 kilometers per hour. The early use of the charger and the overall tuning ensure plenty of power at the crankshaft even in the lower and middle speed range. 450 Newton meters are achieved at just 2500 rpm, which corresponds to 83 percent of the maximum torque of 540 Nm, which is available at 4500 rpm.

In the new turbo generation, the intake air is split and flows to the left and right KKK-K16 exhaust turbochargers. The compressed partial flows enter separate charge air coolers with optimized pressure loss before they are cooled and brought back together and flow to the cylinder heads via the throttle valve and the low-resistance plastic intake manifold.

The division into two partial flows enables small turbochargers with low mass moments of inertia, which significantly improves the dynamics and elasticity compared to an engine with the same power but only one turbocharger.

The air mass control optimizes the torque characteristics.

Porsche regulates the air mass via a bypass valve (boost pressure control valve) that is integrated in the turbocharger. The air mass measured by the hot-film air mass meter (HFM) is compared with the previously determined target value, which is stored in a map. With the help of the latest generation of engine management, the Bosch Motronic M5.2, the air mass control is implemented for the first time on a biturbo engine. In order to optimize the overall efficiency and response, the air mass must be regulated depending on various parameters. In particular, the control unit records the throttle valve position, engine speed, charge air temperature, ambient pressure and knocking events. A large control range ensures that the engine can switch from 98 RON to 95 RON fuels as required.

The exhaust system is divided into two systems, one per cylinder bank. After passing through the turbocharger turbine, the exhaust gas flow flows into independent metal carrier catalysts. The exhaust gas composition can be optimally monitored and controlled by the engine management system via four lambda sensors (one in front of and one behind the catalyst). This high level of design effort ensures the lowest possible pollutant emissions, even under the highest load, which means that the EC limits that have been in force since 1996 are already significantly exceeded.

Constant monitoring enables cleaner air

Porsche is making a valuable contribution to environmental protection in the new 911 Turbo with a constant exhaust gas monitoring system for all exhaust-related components, which is the first vehicle manufacturer to use worldwide. The so-called "on-board diagnosis (OBD II) checks the catalytic converters and lambda sensors, the function of the tank ventilation with activated carbon filter, the secondary air injection, the fuel system and registers combustion misfires. OBD II - already required by law in the USA - requires a high level of development effort and a particularly complex engine management system.

In Germany, pollutants are currently only checked every two years during the exhaust gas test (AU). A control system installed in the vehicle can immediately detect any deviation from the target value. In addition, an on-board diagnosis can check significantly more components than the measuring devices of the usual AU.

The new six-speed gearbox improves speed adjustment

The 911 Turbo is equipped with a newly developed six-speed gearbox that does justice to the significantly increased power and torque values and allows better speed adjustment. In addition, the new double-cone synchronization for first and second gear offers noticeably greater shifting comfort than the predecessor. This means that shifting forces have been reduced by 40 percent. In addition, the pedal force has been reduced by 25 percent with hydraulic clutch support. The disengagement travel has also been reduced by 15 percent compared to the predecessor. This makes things much easier for the driver, especially on short journeys. Thanks to a reservoir, the hydraulic support is maintained over the long term even when the engine is not running.

Four driven wheels bring the power to the road

The all-wheel drive with its intelligent lightweight design enables superior driving dynamics and maximum traction in the Turbo as well. The power distribution from the rear axle to the front axle is handled by a viscous coupling with a transaxle shaft to the front axle, which automatically distributes the propulsion force depending on the slip of the rear wheels. There is also an asymmetric mechanical limited-slip differential on the rear axle.

The automatic brake differential (ABD), which acts on the rear wheels, detects the drive slip of individual wheels via the ABS sensors. Up to 70 km/h, the wheel that tends to spin is braked in order to maintain optimal power transmission.

The complete all-wheel drive system automatically offers optimal traction in any road condition and, at 50 kilograms, is the lightest on the market. Above all, the high performance potential of the new 911 Turbo is optimally distributed to all wheels without intervention by the driver, thus ensuring high driving stability.

The chassis is based on the design of the 911 Carrera

The Turbo chassis is based on the front axle design of the 911 Carrera with spring struts, wishbones and stabilizer. A larger caster angle and the negative steering roll radius improve straight-line stability and braking stability. The rear axle is constructed in accordance with the new LSA system (LSA stands for lightweight construction, stability and agility) of the Porsche 911 Carrera. The multi-link axle with the noise-dampening subframe is dimensioned in such a way that even motorsport use is possible without component changes .

The sporty chassis tuning of the Turbo ensures driving stability, low rolling and pitching movements and remarkable long-distance comfort. High lateral forces can be built up through minimal camber changes. The maximum achievable lateral acceleration is therefore at the highest level at more than 1g.

The complex and carefully tuned chassis in conjunction with the Porsche all-wheel drive gives the new 911 Turbo harmonious and safe handling with the best traction. The dynamics and driving pleasure of the 911 Turbo are retained without restriction. The servo-assisted rack and pinion steering with precise response also contributes to the agile driving impression.

The best brakes are a matter of course

At Porsche, a racing-ready braking system designed for the highest demands is a matter of course. The cooling air supply, braking system, wheel/tire dimensions and ABS ensure exemplary stability. The four-channel ABS 5 in the 911 Turbo ensures short braking distances even on uneven roads. On the rear axle, the brake disc diameter has been increased from 299 to 322 millimeters compared to the previous model. The electro-hydraulic brake booster further improves the controllability. The internally ventilated and perforated brake discs are effectively cooled by the fresh air supply via openings in the front section and the open wheel styling (optimized heat dissipation).

The calculated maximum braking power (from 280 km/h, unladen weight plus driver) is 1427 kW/1941 hp, almost five times the drive power of 300 kW/408 hp. This makes it possible to decelerate the Turbo from 100 km/h to a standstill in 2.61 seconds, while it takes 4.5 seconds to accelerate (0-100 km/h).

Hollow-spoke wheels exclusively for the Turbo

To make aluminum wheels even lighter, Porsche has developed a production technology that allows the wheel spokes to be hollow. This new technology is being used for the first time and as standard for the wheels of the 911 Turbo. This process makes the 18-inch high and eight-inch wide front wheel 2.6 kilograms or 23 percent lighter than conventional production. The weight of the ten-inch wide rear wheel is reduced by 2.9 kilograms or 20 percent. All four wheels therefore weigh a total of 40.8 kilograms, eleven kilograms less than before. The rim and the disc (star) of the wheel are two separate components in the new process, which are only permanently connected using a special welding process (friction welding). By producing the two elements separately, the width of the rim formats can be varied as desired. At the front, the new technology wheels in 8 J x 18 are fitted with 225/40 ZR 18 tires, and at the rear in 10 J x 18 with 285/30 ZR 18 tires. Turbo body with higher torsional rigidity. The new 911 Turbo is characterized by a dynamic but unobtrusive design. The visual distinction from the Carrera is provided by a front section with large air intakes, modified sills integrated into the rear side section, 25 millimeter wider wheel arches on each side and a modified rear section with a fixed spoiler. The roof panel on the upper edge of the rear window underlines the look, but also serves as a mount for the third brake light in countries where this is mandatory.

A key quality feature of the Turbo body is that it has around 20 percent more torsional rigidity than its predecessor, with the same weight. The support structure ensures optimal energy absorption at the front, sides and rear with an extremely stable passenger cell and thus the best possible occupant protection. The use of fully galvanized body panels, which has been standard practice at Porsche for almost 20 years, is a guarantee of longevity and unchanged crash safety, even after years. The Turbo body is based on that of the 911 Carrera.

New lighting technology for more safety

In some countries, the 911 Turbo comes with the newly developed and highly effective Litronic (light electronic) dipped headlights as standard. This complex lighting system works with a particularly bright gas discharge lamp, a lens with a cover (similar to a slide projector) and a PES (polyellipsoid headlight) reflector. The ballast generates a voltage of ten kilovolts to ignite the lamp, which is regulated to 85 volts in continuous operation. The power requirement is 30 percent lower than with halogen lamps.

Exclusive equipment features

Porsche has reserved an exclusive color combination for Turbo customers. The elegant Arena Red Metallic color can be ordered at no extra charge.

Full leather upholstery is standard, as are fully electric comfort seats. The sports seats newly developed for the Turbo can also be ordered at no extra charge. They offer excellent lateral support, a foldable and adjustable backrest, and electric height adjustment. The anthracite-painted shell section ensures the sporty look.

Two airbags have been mandatory for Porsche since the 1991 model year. A fully automatic air conditioning system and automatic cruise control are also included. The new alarm system with interior monitoring, central locking and immobilizer, which meets the strictest insurance requirements, offers effective theft protection. The standard Blaupunkt Bremen RCM 43 cassette radio or, optionally, the Blaupunkt Munich RD 104 CD radio is equipped with the powerful sound package, which serves as the basis for the optional Digital Sound Processing (DSP).