The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 3/26 M Car Covers (by State of Nine) | 12/12 Make Amazon Pay Saabnet!


9-5 Powertrain



SAAB 9-5 POWERED BY ALL-TURBO ENGINE RANGE

Responsive performance, low exhaust emissions and low fuel consumption

NORCROSS, Ga. - The Saab 9-5 all turbo engine range features two light pressure turbo engines, both benefiting from more than twenty years of Saab experience in the field of automotive turbocharging. Featuring the world's first single-bank turbocharger application on a V-6 engine, Saab's asymmetrically turbocharged 3.0L V-6 is a compact and lightweight powerplant that delivers the exhilarating performance of a much larger engine. The asymmetrically turbocharged V-6, rated at 200 hp, is matched exclusively to the automatic transmission. The 170 hp 2.3L Light Pressure Turbo four-cylinder engine is available with a five-speed manual or four-speed automatic transmission. Developed under the Saab Ecopower concept, both engines feature the latest version of Saab's Trionic engine management system. A highly sophisticated engine management system, Trionic utilizes a 32-bit microprocessor capable of two million calculations per second to control Saab's Direct Ignition, the air/fuel mixture ratio, turbo boost pressure and now also the electronic "drive-by-wire" throttle. Both engines provide a unique combination of extremely low emission levels with high fuel efficiency and driver/fuel quality adaptable power and torque levels, for flexible and responsive driving characteristics.

Saab V-6 Ecopower with Asymmetric Turbo
The Saab 9-5 is the first car in the world to be equipped with an asymmetric turbocharging system. This new engine concept uses the Saab 3.0L V-6 engine equipped with one turbocharger on the front cylinder bank, driven by exhaust gases from only those three cylinders. The single highly-responsive Garrett GT17 turbocharger delivers compressed air to all six cylinders in both cylinder banks. Combined with a boost pressure which reaches only 3.6 psi (0.25 bar), this technology allows a patented boost control system via the throttle control which eliminates the need for a wastegate. The turbocharger housing is integrated into the exhaust manifold instead of being a separate casting, for even greater efficiencies. The advanced 24-valve 3.0L Turbo V-6 engine uses a narrow angle of 54 degrees between the cylinder banks and has been specifically developed for the new 9-5. The engine's strong maximum torque of 229 lb.-ft. at only 2,500 rpm, available all the way up to 4,000 rpm, provides useful performance to reduce passing times and avoid potentially hazardous situations. The high torque also allows longer gearing, which improves fuel economy and reduces engine noise at speed. Maximum power is 200 hp at 5,000 rpm. The engine's new Saab-developed Trionic engine management system, called Trionic 7, includes electronic "drive-by-wire" throttle control and a high-speed data bus communication link to the electro-hydraulically controlled 4-speed automatic transmission, which is standard with the V-6. Traction control is also standard with the V-6, applying the brakes and, when necessary, reducing engine power via the electronic throttle to prevent the front wheels from spinning on slippery roads.

Saab's 2.3L Ecopower Engine
The Saab 9-5's 2.3L Ecopower Light Pressure Turbo engine develops 170 hp at 5,500 rpm. The engine's Light Pressure Turbocharger uses relatively low boost pressures (maximum boost of about 5.8 psi or 0.4 bar) to deliver boost quickly, providing higher torque at low engine speeds. Extra power is put to use only when it is actually needed, providing a comfortable, satisfying driving experience, with responsive performance, low fuel consumption and low exhaust emissions. Strong low-end torque also contributes towards safer passing and more relaxed driving, without needing to frequently rev the engine to high rpm. Because the operating parameters are all controlled by the Saab Trionic engine management system, the performance of the 2.3 liter Ecopower engine has been programmed to develop optimum power with a very flat and broad torque curve. The power curve peaks at 5,500 rpm, while the torque curve is actually a torque plateau-a completely straight line from 1,800 to 3,500 rpm. In fact, over 70 percent of the peak torque value is developed from just above the idling speed to the electronically-governed redline at 6,000 rpm.

New Generation Saab Trionic
The advanced Saab Trionic engine management system used for the Saab 9-5 engines has been designed by Saab's own engineers, who launched their first "smart" engine management system, the Automatic Performance Control (APC) turbo controller, in 1980. Saab also introduced the industry's first Direct Ignition system in 1985. Saab is one of the few car manufacturers in the world to develop its own engine management systems. In the 9-5, Saab has developed the Trionic engine management system into a new generation known as version 7-the first Saab-made engine control system capable of handling a six-cylinder engine. Similar to the aircraft industry's "fly-by-wire" technology, Trionic 7 now controls the throttle as well as the air/fuel mixture ratio, Direct Ignition and turbo boost pressure, providing a completely new approach to engine control. The brain of the Saab Trionic system is a 32-bit microprocessor capable of carrying out two million calculations per second. The microprocessor is programmed with complex algorithms and theoretical models of the engine to be able to monitor and simultaneously control the Direct Ignition timing, fuel injection rate and intake air flow. Saab's Trionic engine management control system is capable of adapting to always optimize engine performance based on driver demands and the quality of fuel being used. The Trionic system operates using a high-speed data bus to communicate with other systems in the car. This Controller Area Network (CAN) has the capacity to transmit data at up to one million bits/sec. It allows all parts of the system to "talk" to each other at extremely high speed so they can interact when necessary. Because the digital information is identifiable and specific, a whole bundle of conventional wires can be replaced by a single power lead and just one small-gauge data cable. Information on engine temperature, for example, which might be needed for several different processors to function correctly, can be sent around the system and updated continuously as a single message packet, instead of each system gathering its own information signal from its own dedicated sensor or the main controller unit.

Each Cylinder Is Constantly Monitored
The Saab Trionic system also analyzes the combustion process by using the spark plugs for measuring ionization within the cylinders. A weak voltage is applied across the gap of every spark plug after each combustion stroke. The current flowing back to the control unit is dependent on the number of ions that have been formed, which provides a measure of the combustion in each cylinder. Ionization measurement reveals whether the fuel/air mixture has ignited and burned correctly. If not, the system adjusts the fuel quantity, the Direct Ignition timing or the boost pressure. The Direct Ignition timing is also monitored separately in each cylinder. The Saab Trionic system can control each cylinder individually, which is a more accurate way of controlling the engine than by using averages of measurements carried out at only one point. This continuous monitoring enables the fuel energy to be put to optimum use. The result is a reduction in fuel consumption and exhaust emissions. Each fuel injector is controlled individually and the air mass entering the engine is calculated from measurements of pressure, temperature and air mass flow. The processor is so fast that it even checks during the injection phase whether any factors have changed, making in-cycle corrections if required by varying the fuel pulse from a minimum of two milliseconds (1/500th sec) to the complete four-stroke cycle. This makes the control of air/fuel ratio significantly more accurate. The unique Saab Direct Ignition (DI) system has no distributor and no moving parts. Each spark plug has its own miniature ignition coil mounted in a cartridge directly above its terminal, eliminating the need for high-tension leads and protecting the plug insulator from moisture and dirt. This arrangement eliminates starting problems in damp and cold weather and provides a more reliable spark voltage under all conditions. Saab DI uses a capacitive rather than a conventional inductive system to generate the spark firing voltage, which at 40,000 volts is some 40 percent greater than in conventional ignition systems. To insure long spark plug life, the Direct Ignition system is programmed to fire a shower of sparks, at each spark plug electrode, upon engine shut-off to keep them free of any carbon build-up.


Return to 1999 Model News

StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]