Specifications

297x198_A8_Integration_Fas09_Bild_048 48 18.02.13 12:27
TDI®48
The fuel consumption and CO₂ emission figures can be found from page 124 onwards.
The piezo injectors open and close
within milliseconds and inject fuel
several times into the combustion
chamber at pressures of up to 2,000
bar. In some cases, an injection
process can involve the injection of
the tiniest of amounts weighing less
than a thousandth of a gram.
One in every two Audi cars sold today is a diesel.
What sounds perfectly normal now was cause
for huge excitement 20 years ago, when Audi
revolutionised the market with the first 2.5 litre
TDI engine. Since then, developments such as
common rail technology have made TDI even
more efficient. Piezo injectors ensure the fuel is
finely and precisely distributed. Consequently,
since the first TDI, the engines have become
more economical, whilst specific output has
increased. So it was only logical that a diesel car
should then enter the world of motorsport. And
successfully too: in 2006, Audi was the first car
maker to win the 24 Hours of Le Mans with a
diesel-powered race car, the Audi R10 TDI – and
then went on to repeat this victory several times
over.
Engines with winner’s genes await you in the
Audi A8. For example, the 3.0 TDI engine with
184 kW. Of course, efficiency does not exclude
driving enjoyment: with the powerful 550 Nm
of torque, you can accelerate your A8 from 0 to
100 km/h in just 6.1 seconds. The 3.0 TDI with
150 kW and front-wheel drive has a combined
fuel consumption of 6.0 l per 100 km. And it goes
without saying that both work with the intelligent
common rail technology. In addition to the
standard catalytic converter and diesel particulate
filter, the 3.0 TDI clean diesel with 184 kW is
equipped with a technology that specifically
reduces nitrogen oxides.
The 4.2 TDI is even more powerful: 258 kW and
a maximum torque of 800 Nm will take you
from 0 to 100 km/h in just 5.5 seconds. Fuel
consumption, however, is just 7.4 litres per
100 km. This is also assured by the common rail
technology which injects the fuel directly into
the combustion chamber at pressures of up to
2,000 bar. An innovative thermal management
system is at work in the 4.2 TDI engine too where
it helps to reduce fuel consumption by heating
up the coolant quickly. In addition, it has been
possible to reduce the weight of the engine
despite its greater engineering complexity.
Pre-injection results in a “gentle”
combustion process and consequently
excellent combustion acoustics
and agreeable engine running
characteristics.
TDI®
In other words: where is the tank?
A8_A8Hybrid_S8_Fas18_2013_03.indd 48 30.04.13 14:02