D3 powertrain

Motive power in the second-generation D3 S8 powertrain features a 5.2 litre all aluminium alloy 5,204 cubic centimetres (317.6 cu in) Fuel Stratified Injection (FSI) 40-valve (four valves per cylinder) 90° V10 petrol engine (parts code: 07L, identification code: BSM). This engine is a derivative of the Gallardo's original 5.0 litre Lamborghini V10,^[3] which was also developed under the Volkswagen Group ownership. On this Audi-only variant, compared to the Lamborghini engine, it features a longer stroke and wider bore - which increases the displacement of the engine, and produces more torque at lower revs, making it more suitable for the larger and heavier full-sized luxury Audi saloon. It produces 331 kilowatts (450 PS; 444 bhp) at 7,000 rpm, and 540 newton metres (398 ft·lbf) of torque at 3,500 rpm. It utilises twin chain-driven double overhead camshafts (DOHC), and variable valve timing for both intake and exhaust valves. Engine management is by way of Bosch DI-Motronic MED 9.1 electronic engine control unit, which controls the mapped direct ignition, ten individual spark coils, common rail cylinder-direct sequential multi-point fuel injection, and drive by wire throttle.

The same 5.2 V10 engine is also used in the third-generation Audi S6 (C6), but in a slightly lower state of tune where it develops 320 kilowatts (435 PS; 429 bhp).

A sports-optimised ZF 6HP26-A61 six-speed tiptronic automatic transmission (parts code: 09E, identification codes: KLW or KZK) (gear ratios - 1st: 4.171, 2nd: 2.340, 3rd: 1.521, 4th: 1.143, 5th: 0.867, 6th: 0.691) with "Dynamic Shift Programme" (DSP) and "sport" mode, with steering wheel mounted paddle-shifters, is the only offering. Output is transmitted via Audi's trademark quattro permanent four-wheel drive system, initially using the Torsen T-2 50:50 dynamic centre differential, and from 2008 model year, utilising the latest Torsen T-3 asymmetric dynamic centre differential, with a 'default' torque distribution of 40% to the front axle and 60% to the rear. Final drive ratio is 4.055, and traction is assisted with Audi's "Electronic Differential Lock" (EDL) and "Anti-Slip Regulation" (ASR) (commonly known as traction control system) - both functions of the Bosch ESP 5.7 (or the later ESP 8.0) Electronic Stability Programme.

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