Technical data

S_54_A4_Fas09_allr_S_Mod_B 54 27.02.12 11:34
TDI®
The fuel consumption and CO₂ emission figures can be found from page 110 onwards.
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 with its refined and
precise fuel distribution have made TDI even more
efficient. 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 Le
Mans 24 Hours with a diesel-powered race car, the
Audi R10 TDI – a victory which it has repeated
several times over, most recently in 2011.
Powerful 2.0 TDI and 3.0 TDI engines are
available for the Audi A4, and these are equipped
with intelligent common rail diesel technology.
In addition, they are equipped with the start-stop
system as standard. The 3.0 TDI (180 kW) is
additionally available for the A4 and A4 allroad
quattro as clean diesel. This engine employs a
technology that systematically reduces nitrogen
oxides. In addition to their efficiency, the TDI
engines are of course also characterised by their
power. With the Audi A4 Saloon and the A4 Avant
which are driven by 2.0 TDI engines with 100 kW
and 112 or 116 g CO₂/km, and with 120 kW and
115 or 120 CO₂/km, the balance between
performance and consumption has been
specifically further improved. These models are
in particular characterised by a low consumption
and reduced CO₂ emissions.
54
The piezo injectors in the 3.0 TDI
open and close in fractions of a
millisecond 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
gramme.
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?
A4_A4_Avant_Fas18_S_2012_03.indd 54 13.04.12 15:14