AUDI Performance Optimization 4

Question 1

An Audi technician finds carbon buildup on the intake valves of a 2.0T TFSI engine. Which cleaning method is factory-approved?

Accepted Answer

Walnut shell media blasting through the intake ports

Answer

Walnut shell blasting via an adapter at the intake manifold is the OEM-recommended method to remove GDI carbon deposits without damaging valve seats.

Question 2

What effect does increasing ignition advance (earlier spark timing) have on an Audi engine's power output, assuming no knock occurs?

Accepted Answer

Increases peak cylinder pressure earlier for more work on the piston

Answer

Advancing spark timing allows combustion to peak near TDC, maximizing the force applied to the piston during the power stroke.

Question 3

Audi's 'RS Torque Rear' mode on an RS3 with torque-vectoring directs more torque to which wheel during a left-hand corner?

Accepted Answer

Outer (right) rear wheel

Answer

During a left turn, the outer right rear wheel receives more torque, creating a yaw moment that rotates the car into the corner for agility.

Question 4

A customer complains that their Audi TTS feels sluggish above 4,500 rpm after a software update. Which VCDS measurement block should the technician check first?

Accepted Answer

Boost pressure actual vs. specified and ignition timing correction

Answer

Comparing actual vs. target boost and checking for timing retard identifies whether the ECU is limiting power due to knock, boost, or temperature protection.

Question 5

Which exhaust system configuration is typically used on Audi RS models to provide an active sport exhaust note?

Accepted Answer

Electronically controlled bypass valves that open at higher rpm/load

Answer

Active exhaust flaps open under load/rpm to route gases around the muffler, increasing exhaust note without drone at low speeds.

(AUDI) Audi Certified Mechanic Practice Test

(AUDI) Audi Certified Mechanic Practice Test

AUDI Performance Optimization 4