Specifications
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The fuel consumption and CO₂ emission figures can be found from page 124 onwards.
V8: 4.0 TFSI engine (Audi S8)
TFSI with Audi cylinder-on-demand
technology. If the V8 4.0 TFSI engine
of the Audi S8 does not need the full
power of 8 cylinders in the partial-load
operational range, Audi cylinder on
demand closes the intake and outlet
valves of 4 cylinders – 2 each per cylinder
bank – and their ignition and fuel
injection is switched off. This means that
neither is air taken in or fuel injected nor
is exhaust gas emitted. The deactivation
depends on several factors: when revs are
between 960 and 3,500 rpm, the speed
is at least 25 km/h and you are travelling
in at least third gear of the 8-speed
tiptronic.
Who says that you can only think about fuel in
terms of litres? Our engineers wanted to put
every drop of petrol to optimum use. From this
emerged FSI.
In FSI technology, the fuel is injected directly into
the combustion chamber and atomised into a
fine spray. This way, the fuel – metered to almost
droplet precision – can be called upon the
millisecond that the engine requires it. This leads
to better utilisation of the fuel and ultimately,
reduced consumption. The legendary 24 Hours of
Le Mans has shown how important an efficient
use of fuel is: there, the Audi R8, powered by
an FSI engine, has been able to enjoy several
convincing victories.
The Audi A8 employs the efficient FSI technology
too. The latest generation of engine control units
and an innovative thermal management system
also help to reduce fuel consumption.
The 6.3litre W12 engine with 368 kW generates
a maximum torque of 625 Nm, which accelerates
the car with agility to up to 250 km/h – in the
process reaching 100 km/h in just 4.7 seconds.
It is remarkable for its running smoothness.
The Audi S8 has a V8 4.0 TFSI engine that features
the new innovative Audi cylinder-on-demand
technology. This ensures that during partial load
operation, only four of the eight cylinders are
used – without you noticing the difference.
The engine runs just as smoothly and powerfully,
but using less fuel and emitting less CO₂.
Thanks to its very spontaneous responsiveness
and exceptional power delivery across the
entire engine speed range, the 8-cylinder engine
promotes a sporty superior driving style. Its
382 kW accelerate the S8 at a torque of 650 Nm
from 0 to 100 km/h in 4.2 seconds. At 250 km/h
the engine is electronically regulated.
The Audi A8 3.0 TFSI quattro also employs
TFSI technology. And the remarkable thing about
it is that it combines the advantages of FSI with
a supercharger that ensures even better power
delivery. The 6-cylinder engine generates a
powerful 213 kW. It features an innovative
mechanical supercharging system with
intercooling, which turns the 3.0 TFSI V6 into a
compact powerhouse – with moderate fuel
consumption. The peak torque of 420 Nm is sure
to impress you, as will the torque curve. Thanks
to its very spontaneous responsiveness and
exceptional power delivery across the entire
engine speed range, the 6-cylinder engine
promotes a particularly dynamic driving style.
The Audi A8 accelerates to 100 km/h in
6.1 seconds and still has plenty of power
reserves left after that.
twin-scroll bi-turbocharger
air-to-water intercooler
Audi cylinder on demand
switch valve in coolant circuit
for thermal management
intake manifold with switch flaps
generator with recuperation
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