Audi TT (2007 year). Manual — part 224

29

380_076

Function

A soundpipe is connected between the air mass meter and the throttle valve unit in the air intake tract.
The soundpipe made up of three parts: the primary pipe, which is connected to the air intake tract, the sound
generator and the secondary pipe, which is connected to the vehicle interior via the engine bulkhead. The
primary and secondary pipes as well as the sound generator are configured in such a way that it is possible to
influence the "bandpass characteristic"*, and hence the acoustic transmission range. However, the sound
generator is the key component.The system is designed such that the sound becomes meatier when the
driver demands more power from the engine.
The pressure pulsations which during the gas exchange cycle are transmitted to the membranes in the sound
generator, where they are amplified by the sound generator and relayed to the vehicle interior. Another further
task the membranes is to seal the gas flow between the air intake tract and the vehicle interior. The foam core
in the sound generator has the task of maintaining the shape and position of the membranes.

* A bandpass characteristic is produced, for example, by connecting the highpass and lowpass filters in
series. Only a defined range of frequencies is allowed to pass, depending on the circuit configuration.

Securing clip

Secondary pipe

Primary pipe

O-ring

Foam core

Membranes

from intake
manifold

Sound generator

to vehicle
interior

30

Suspension system

Suspension system

Overview

The Audi TT Coupé ‘07 is available with three different suspension systems. The dynamic suspension system
represents the basic specification. The semi-active "Audi magnetic ride" suspension is optional. The driver can
select between comfort and sport suspension settings at the touch of a button.
quattro GmbH is also offering an S-Line suspension system, which is sportier than the dynamic suspension
system.The main axle components are identical to those of the Audi A3 in respect of their design and
function.

Front axle

An improved version of the McPherson suspension
is used.The design of the front axle is identical to
that of the Audi A3. Track width is 13 mm wider on
each side than the Audi A3.

Detail modifications have been made to reflect the
particularly sporty character of the Audi TT Coupé
‘07. In addition to the tuning parts (springs,
dampers and anti-roll bars), the same axle
components are used in all TT Coupé suspension
variants.

380_074

380_066

31

Rear axle

The rear axle of the Audi TT Coupé ‘07 is basically identical in design and function to the rear axle on the
Audi A3. The wheel carriers, damper bearings and wheel bearings are modifications on the components on
the Audi A3.Track width has been increased by 15 mm on each side compared to the Audi A3. The suspension
and damping components (springs, dampers and anti-roll bars) were adapted to the specific requirements of
the TT Coupé. Additional stone chip protection is provided for certain markets. The trailing arms and spring
links on these models are protected by plastic claddings.

380_071

380_072

Rear axle for front-wheel drive

Rear axle for quattro models

32

Brake system

Overview

Suspension system

ESP

TEVES Mk60E1
with optional low tyre pressure indicator

Front axle brake caliper

16" for all four-cylinder models
17" for all six-cylinder models

Brake servo

10", 11", 7/8"
with contactless brake light switch
without dual rate characteristic