per cylinder (exhaust valves sodium filled for increased cooling), 20 valves total, low-friction roller finger cam followers with automatic hydraulic valve clearance compensation, simplex roller chain-driven (relay method) lightweight double overhead camshafts (DOHC), variable valve timing with continuous adjusting intake and exhaust camshaft timing of up to 42 degrees from the crankshaft, two-stage 'valvelift' variable lift control for inlet valves, siamesed inlet ports, Audi "RS" 'red' plastic cam cover aspiration twin charge pressure sensors; one pre-throttle plate, one intake manifold mounted, no air flow meter, cast alloy throttle body with electronically controlled throttle valve, two piece intake manifold with charge movement flaps adjusted by a continuous-action pilot motor, water-cooled turbocharger incorporated in exhaust manifold with diameter outlet, generating up to boost, separated central lower front-mounted intercooler (FMIC) fuel system fully demand-controlled and returnless: fuel tank-mounted low-pressure fuel lift pump; Fuel Stratified Injection (FSI): single-piston high-pressure injection pump supplying up to fuel pressure in the stainless steel common rail fuel rail, five combustion chamber sited direct injection sequential solenoid-controlled fuel injectors, air-guided combustion process, multi-pulse injection with homogeneous mixing, stratified lean-burn operation with excess air at part load, ultra-low sulfur unleaded petrol (ULSP) ignition system & engine management Beru longlife spark plugs centrally positioned in combustion chamber, mapped direct ignition with five individual direct-acting single spark coils; Bosch Motronic MED electronic engine control unit (ECU), cylinder-selective knock control via two knock sensors, permanent lambda control exhaust system secondary air injection pump for direct injection into exhaust ports to assist cold start operation, cast iron exhaust manifold (with integrated turbocharger), one primary and two secondary high-flow sports catalytic converters, two heated oxygen sensors monitoring pre- and post-primary catalyst exhaust gases (secondary catalysts unmonitored), vacuum-operated map-controlled flap-valve mounted in one rear exhaust silencer tail pipe dimensions length: , mass: DIN-rated motive power & torque output at 5,400–6,500 rpm (specific power of per litre); at 1,600–5,300 rpm; redline: 7,100 rpm – RS Q3 at 5,400–6,500 rpm (specific power of per litre); at 1,600–5,300 rpm; redline: 7,100 rpm – RS 3, TT RS, RS Q3 (facelift) at 5,400–6,500 rpm (specific power of per litre); at 1,600–5,300 rpm; redline: 7,100 rpm – TT RS plus at 5,400–6,500 rpm (specific power of per litre); at 1,600–5,300 rpm; redline: 7,100 rpm – RS Q3 performance, RS 3 (2015–) at 5,400–6,500 rpm; (specific power of per litre); at 1,600–5,300 rpm; redline: 7,100 rpm – TT RS, RS 3 (2017–),