Audi TT Turbocharging and Forced Induction Systems

Question 1

What type of turbocharger is used on the Audi TT 2.0 TFSI engine?

Accepted Answer

Twin-scroll turbocharger

Answer

Variable geometry turbocharger (VGT)

Answer

Centrifugal supercharger

Answer

Roots-type supercharger

Question 2

What is the typical boost pressure range for a stock Audi TT 2.0 TFSI (Mk2)?

Accepted Answer

10–15 psi (0.69–1.03 bar)

Answer

5–8 psi (0.34–0.55 bar)

Answer

16–20 psi (1.10–1.38 bar)

Answer

22–26 psi (1.52–1.79 bar)

Question 3

Which component is responsible for regulating boost pressure by venting excess exhaust energy on the Audi TT turbo system?

Accepted Answer

Wastegate

Answer

Blow-off valve (BOV)

Answer

Intercooler bypass valve

Answer

Boost controller solenoid

Question 4

What is the purpose of the diverter valve (DV) found on the Audi TT's turbo system?

Accepted Answer

It recirculates compressed air back to the turbo inlet when the throttle closes

Answer

It redirects boost pressure to the wastegate

Answer

It opens to cool the intercooler under boost

Answer

It increases exhaust backpressure at idle

Question 5

On the Audi TT, the N249 valve is associated with which function?

Accepted Answer

Turbo boost pressure recirculation bypass

Answer

EGR flow control

Answer

Fuel pressure regulation

Answer

Secondary air injection switching

Question 6

What symptom is most commonly associated with a failed or leaking diverter valve on the Audi TT?

Accepted Answer

Loss of boost pressure and hesitation under acceleration

Answer

Excessive oil consumption

Answer

Rough idle and misfires at low RPM

Answer

Overheating coolant temperature

Question 7

Where is the charge air cooler (intercooler) located on the Mk2 Audi TT 2.0 TFSI?

Accepted Answer

Internal water-to-air, within the intake manifold

Answer

Front-mount, behind the bumper grille

Answer

Top-mount, above the engine

Answer

Side-mount, in the front fender well