The Saab 9-3 Sport Sedan 2.0T XWD Aero is a saloon that equips a gasoline engine 210 hp supercharged associated with all wheel drive system.This version is distinguished mainly by being a very comfortable and powerful car, capable of offering good benefits. Although the suspension react rather sharply as we pass by a bump or sign in disrepair, it still seems a saloon highly recommended for those drivers who values comfort on motorways.
Suspensions
The front suspension uses McPherson struts with upper anchorages decoupled to separate loads of cushioning and suspension, gas shock absorbers and a direct-acting stabilizer bar. The triangles below are mounted on a hydroformed subframe (hollow section) and include a joint hydraulic rear anchoring each side for optimum damping.
The independent rear suspension is also mounted on a separate subframe which incorporates three transverse and one longitudinal, with a stabilizer bar. It also uses bieletas convergence and spherical ball joints instead of rubber bushings seals in the joints of the frame and the hubs (with the solutions you get a rear directional effect. When entering a curve, the elasto-kinematics of the train rear causes a very slight deflection of the rear wheels in the opposite direction of the indication of the direction, ie in the outer wheel divergence and convergence in the inner wheel.
Depending on the radius of the curve and the corresponding loads on the rear axle, one degree of movement at the front wheels normally produce small but significant response in the rear, about a hundredth of a degree.
In theory, this configuration is looking for a more neutral cornering behavior. In practice, the Saab 9-3 Aero 2.0T XWD Sport Sedan is a car with a very pronounced understeer in slow curve and a neutral reaction curve more quickly.
Saab XWD all-wheel drive
The active all-wheel drive system (Saab XWD) contributes its bit to get good traction on curves. Available as an option on Aero variants. This device uses a locking rear differential with electronic control. Supplied with an assortment of six-speed manual transmissions or automatic.
The Saab XWD system operates completely automatically depending on demand and sends torque to the rear wheels depending on driving conditions. The distribution of torque to the front and rear axles are always optimized.
The system is governed by its own control unit, which functions in harness with the engine and control modules of ABS and stability control. The hardware consists of a power transfer unit (PTU) in the front differential, which sends torque through a shaft to the Rear Drive Module (RDM). This incorporates a torque transfer mechanism (TTD) and an electronically controlled limited slip differential (ELSD). Both are wet, multi-clutch units from Haldex.
On startup, the TTD is initially activated when the clutch plates are forced together under hydraulic pressure, thereby engaging the RDM. This proactive role is a valuable improvement in current technology, which requires the detection of wheel slip before the TTD is activated. This enhanced functionality provides the driver with maximum traction immediately for smooth acceleration and intense from rest without the possibility of any initial hesitation.
On the open road, the torque transmission between the two axes are continuous and continuously modified by the action of a valve in the TTD, which increases or reduces the pressure on the clutch plates. The information from sensors in the ABS and stability control-measuring wheel speed, rotation about the vertical axis and the steering angle, is used for the careful programming of Saab XWD apply traction in the axis back to balance oversteer and understeer characteristics, improving stability and roadholding.
In highway cruising conditions, when traction or optimum grip is not an issue, only 5% to 10% of torque is normally transmitted to the rear wheels. This helps to save fuel.
This drive system also incorporates an integral multi-locking differential a limited slip differential with electronically controlled multi (Saab calls it commercially as "LSD"). Is installed alongside the RDM and operates via pressurized clutch plates on a principle similar to the TTD. In friction conditions, ice or water, for example, uses signals from sensors rear wheel speed and can transfer up to 40% of torque between the half-shafts, to whichever wheel has more adhesion.
The eLSD offers greater control when turning, hard or completing a maneuver at high speed, as a lane change, by momentarily applying more or less torque to either wheel to help the rear of the car to follow more closely the direction of the front wheels. Thus, yaw damping effect can keep the car better balanced and more tightly controlled without the intervention "outside" of electronic aids to stability.
Installation of Saab XWD includes the fitment of a new rear subframe to carry the RDM, revised rear suspension geometry and new wheel hubs for receiving the bearings. The drive shaft, three pieces, working on two bearings with constant velocity joints for smooth operation with minimum friction losses. The wheelbase and rear track dimensions are unaltered.
Brake Team
The Saab 9-3 Sport Sedan 2.0T XWD Aero uses ventilated disc brakes 302 mm in the front and 292 mm at the rear. The ABS system (anti-lock brakes) and four-channel traction control system (TCS) are standard equipment. The equipment is completed with an automatic device that increases braking hard when we step on the brake pedal.
Other functions for electronic brake control also use the speed sensor wheel ABS and variable valve at each wheel. The electronic control of the force distribution (EBD) ensures the implementation of an optimal braking force on both axes simultaneously, for maximum stability on hard braking.
The Cornering Brake Control (CBC) is activated when the car is traveling in a curve under hard braking. The brake pressure is regulated individually at all four wheels, to keep the car stable, reducing any sudden oversteer or understeer.
The four brake discs are dirt barriers to full format. This helps ensure that the braking performance is not impaired by accumulations of snow, mud or debris that might interfere with the tweezers.
A 2.0-liter turbo with 210 hp
The Saab 9-3 Sport Sedan 2.0T XWD Aero has a gasoline engine 210 hp with all-aluminum 2.0-liter four-cylinder.
The turbocharger is mounted in the engine compartment after the engine is installed transversely. This position allows more rapid heating for the front catalyst, which improves fuel consumption and reduces emissions during the cold operation and benefits of weight distribution.
Mitsubishi TD04 turbocharger with an integrated valve, is used in conjunction with an intercooler. It works with a maximum boost pressure of 0.5, 0.7 and 0.85 bar respectively.
The engine torque delivery is substantially "linear", which allows us to keep the gears for longer periods.
At low engine speeds the engine torque is missing something, however, operation is always very mild and pleasant. The best side of this engine is from 3,000 rpm (maximum power occurs at 5,300 rpm). Thus, its potential comes out as the march stretched to the max. On the road is a car that reaches its maximum speed with relative ease, and its linear stability quite correct.
The fuel consumption is within what you would expect in a car of this kind and power. According to our measurements, combined cycle (city / highway), the mean always stood on the 12.3 liters per 100 km.
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