Audi A5 Sportback: FWD, AWD quattro &
gearboxes (5/7 >)
- The new Audi'A5 Sportback is launched with three transmission choices.
The 2.0 TFSI (132 kW / 180 hp and 155 kW / 211 hp), the
2.0 TDI with 125 kW (170 hp) and the 2.7 TDI (140 kW / 190 hp) come
standard with a six-speed manual transmission (graph below). They will be
followed by the manual 1.8 TFSI entry model and the 3.0 TDI.
The multitronic continuously variable automatic
transmission, which offers a sport mode and a manual mode with eight
simulated gear ratios (electronically set up) will follow shortly after
the launch with the 2.0 TDI (105 kW, 143 hp), the 2.7 TDI (140 kW / 190
hp) and both versions of the 2.0 TFSI (132 kW / 180 hp and 155 kW / 211
A5 Sportback 2.0
TDI with the 6-speed manual gearbox.
The all-wheel drive versions of the 2.0 TFSI quattro,
the 3.2 FSI quattro and the 3.0 TDI quattro get the seven-speed S tronic
dual-clutch transmission which changes gears within a few hundredths of a
second. Its efficiency and long ratio in seventh gear benefit fuel
consumption. The driver can let the seven-speed S tronic shift
automatically or select the gears via rocker switches on the steering
The seven-speed S tronic is made of two separate
transmissions and integrates two nested multi-plate clutches that control
the various gears. The outer clutch directs the torque via a solid shaft
to the gear wheels for the gears 1, 3, 5 and 7. The inner clutch directs
the torque via a hollow shaft revolving around the solid shaft to the gear
wheels for the gears 2, 4 and 6 as well as reverse.
Both transmission structures are continuously active,
but only one is connected to the engine at any one time.
For example, when the driver accelerates in third gear
(1st transmission structure), the fourth gear is already engaged in the
second transmission structure. The gear change occurs by changing the
clutches. The mechatronics module, a compact block comprising controllers
and hydraulic actuators, controls all shift and clutch operations with
precision, even when manoeuvring centimetre by centimetre.
quattro chassis and drivetrain, all-wheel drive (FWD
With the quattro permanent all-wheel drive system,
power flows from the output shaft to the centre differential, which
normally sends 60 percent of torque to the rear differential and 40
percent to the front one. The 60% rear bias gives the sporty feeling of
power being delivered from the back of the car, rather than pulling it
from the front.
However, the 60/40 rear/front distribution ratio
changes when a wheel begins to slip, as the mechanical centre differential
automatically transfers most of the power to the axle with the better
traction. Up to 85 percent can be directed to the rear wheels and up to 65
percent to the front ones.
Shortly after the A5 Sportback is launched, Audi will
introduce a manual transmission and quattro drive paired with a 2.0 TDI
producing 125 kW (170 hp) and a 2.0 TFSI with 155 kW (211 hp). The 3.0 TDI
quattro, equally with six-speed manual transmission, will also become
available at this point.
A new optional (rear) sport differential is available
for the 3.0 TDI quattro and the 3.2 FSI quattro. In addition to the
standard 60/40 rear/front distribution in the centre differential, the
optional sport differential distributes the drive power in continuously
variable proportions between the rear wheels.
Audi A5 Sportback
quattro sport differential.
When steering into or accelerating in a curve, the
sport differential sends most of the torque to the outside wheel,
literally pushing the car into the curve. It promptly prevents oversteer
or understeer, since its short reaction time of under 100 milliseconds is
faster than the ESP stabilization program. Audi says that it even reacts
just as effectively while coasting as it does under load.
With the sport differential, a superposition gear
comprising three gear wheels is added to both the left and right sides of
the classic differential; it rotates ten percent faster than the drive
shaft. A multi-plate clutch actuated by an electrohydraulic actuator
provides the power connection between the shaft and the 10% faster-running
When the clutch closes, it forces the higher speed of
the superimposed gear onto one of the wheels. The additional torque is
drawn off of the opposite wheel via the differential. In this way nearly
all of the torque can be directed to one wheel. The maximum difference
between the wheels is 1,800 Nm (1,327 lb-ft).
The fast reaction speed of the system lies in a
proprietary Audi management software. The controller quickly recalculates
the best distribution of the forces for each driving situation as a
function of the steering angle, yaw angle, lateral acceleration, speed and
The optional sport differential is integrated into the
Audi drive select dynamic control system, and its function can be adapted
to three modes: the “comfort” mode, which is primarily focused on
safety and stability, the “auto” mode and the more sporty“dynamic”