Performance Optimization Flashcards

What does Audi's 'Cylinder on Demand' (COD) system do during light-load highway cruising?

Answer: Shuts down half the cylinders to reduce fuel consumption

COD deactivates 2 of 4 cylinders under light load to improve fuel economy while maintaining smooth operation.

An Audi S4 with a 3.0T engine exhibits boost pressure that is 2 psi below target at full throttle. Which component should be checked first?

Answer: Diverter valve for leakage

A leaking or stuck-open diverter valve bleeds off boost pressure, causing below-target boost at full throttle.

Which Audi performance feature uses rear torque vectoring to improve cornering agility?

Answer: Sport Differential (rear axle)

Audi's Sport Differential actively distributes torque between rear wheels to enhance cornering without understeer.

What is the primary purpose of the intercooler on a turbocharged Audi engine?

Answer: Cool compressed intake air to increase density and power

Intercoolers lower the temperature of compressed air from the turbo, increasing air density and allowing more fuel for greater power.

A technician is diagnosing an Audi RS5 with sluggish throttle response. Fault code P2015 is present. What does this indicate?

Answer: Intake manifold runner position sensor fault

P2015 relates to the intake manifold runner position sensor/switch circuit, which can disrupt airflow and throttle response.

When performing a compression test on an Audi 2.0T TFSI engine, a difference of more than how many psi between cylinders indicates a potential problem?

Answer: 15 psi

A cylinder-to-cylinder compression variance greater than 15 psi typically indicates worn rings, valves, or head gasket issues.

Which Audi technology adjusts exhaust valve timing independently of intake to optimize scavenging at high rpm?

Answer: Audi Valvelift System (AVS) on exhaust side

AVS on the exhaust camshaft adjusts valve lift to optimize exhaust scavenging and high-rpm breathing efficiency.