Audi S4 and S5: diesel hybrid and soft for new sports cars

Audi unveils, a few days later, renewals Audi S4 and S5. The new D-segment sports cars, located halfway between the traditional variants and the sporty RS 4 and RS 5, bring for the first time not only engine diesel but also soft hybrid with electric turbo powered by a 48 V system. These models are part of the long list of hybrid sports and diesel vehicles recently introduced by Audi, such as the new S6 and S7 Sportback TDI.

The powerful engine 3.0 V6 TDI, which equips the S5 Coupe TDI and S5 Sportback TDI (but also the new Audi SQ5), delivers a maximum power of 347 ch and a maximum torque of 700 Nm, delivered between 2,500 and 3,100 rpm. Thanks to the presence of a electric turbocharger (EAV), which mitigates the lack of torque in certain situations, these cars cancel the response time to accelerator pressures.

The system soft hybrid instead, it improves the overall efficiency of the engine by reducing diesel consumption up to a maximum of 0.4 l / 100 km. At the base of the system we find a belt alternator-starter (RSG) connected to the crankshaft. At these we connect 0.5 kWh lithium ion battery, located under the floor of the trunk. This is possible during deceleration recover up to 8 kW of power, the energy being stored in the lithium ion battery.

Between 55 and 160 km / h, depending on the driving program selected with the help of the buttonAudi drive select and driving conditions, if the driver releases the throttle, the system can recover energy, navigate or progress through inertia with the engine off up to 40 seconds maximum. The starter acts as a starter motor, leaving the traditional engine with the only task of starting the engine in cold weather. The system start / stop is already active from 22 km / h.

These devices allow the Audi S5 Coupé and S5 Sportback to consume 6.2 liters of diesel per 100 kilometers, with CO2 emissions of 163-161 g / km (according to the circles): Compared to the previous S5 gasoline models, there is talk of a reduction of 19%. All without sacrificing performance, which remains respectful: acceleration from 0 to 100 km / h is covered in 4.8 and 4.9 seconds (for S5 and S5 Sportback respectively), while the maximum speed of 250 km / h it is electronically limited.

The same engine equips the new Audi S4 Sedan and S4 Before: identical values ​​for the maximum speed (250 km / h) and the acceleration from 0 to 100 km / h (4.8 seconds for the saloon and 4.9 seconds for the family), as well as for consumption ( 6.2 seconds) l / 100 km for the sedan and 6.3 l / 100 km for the Avant) and for the emissions (163-161 sedan and 165-164 Avant).

Even then, the power of these sports cars running on diesel will be exhausted. permanent four-wheel drive with center locking differential and distribution 40:60 (front: rear), in conjunction with 8 speed automatic transmission with torque converter. In the event of loss of adhesion, the bulk of the thrust is transferred to the axle, which ensures superior traction: depending on the driving conditions, up to 70% maximum at the front and up to 85% at the back. .