Transmission & Drivetrain Systems Flashcards

What does the term 'S tronic' refer to in Audi vehicles?

Answer: Audi's dual-clutch automated transmission

S tronic is Audi's marketing name for its dual-clutch transmission (DCT), which uses two separate clutch packs for odd and even gears to enable fast, smooth gear changes.

Which component in the Audi quattro permanent all-wheel drive system distributes torque between the front and rear axles in most longitudinal quattro applications?

Answer: Torsen torque-sensing differential

Most longitudinal-engine Audi quattro vehicles use a Torsen (torque-sensing) center differential, which mechanically apportions torque based on traction demands without electronic intervention.

In an Audi S tronic (DL501) 7-speed transmission, what is the primary function of the mechatronic unit?

Answer: It controls all hydraulic and electronic functions of the transmission

The mechatronic unit integrates the transmission control module (TCM) and hydraulic control body into one assembly, governing clutch engagement, gear selection, and solenoid operation.

What fluid type is specified for most Audi S tronic dual-clutch transmissions?

Answer: Audi/VW G 052 182 dual-clutch transmission fluid

Audi S tronic transmissions require the specific dual-clutch fluid G 052 182 (or its approved equivalent) to properly lubricate the wet clutch packs and maintain correct friction coefficients.

On a longitudinal-engine Audi with quattro, the rear differential receives power via which component?

Answer: A longitudinal prop shaft running to the rear final drive

In longitudinal quattro layouts, a prop shaft (driveshaft) runs from the transmission/transfer case rearward to the rear final drive unit, delivering torque to the rear wheels.

What is the purpose of transmission adaptation (also called clutch adaptation) performed by ODIS on an Audi S tronic?

Answer: It resets kiss-point values so clutch engagement is smooth and precise

Clutch adaptation resets the kiss-point (touch-point) data stored in the mechatronic unit so the TCM learns the exact engagement point of each clutch pack, preventing shudder or harsh shifts.

Which Audi quattro system variant uses a Haldex-style electronically controlled multi-plate clutch on the rear axle rather than a Torsen center differential?

Answer: Transverse-engine quattro (e.g., A3, TT on MQB platform)

Transverse-engine Audi models (built on platforms like MQB) use an electronically controlled multi-plate coupling on the rear axle (similar to Haldex) rather than the Torsen center diff used in longitudinal layouts.