As expected, Ingolstadt’s keenly awaited five-door hatchback adopts the same engine and gearbox combination as its three-door sibling revealed last September, endowing it with higher levels of performance and greater overall efficiency.
Power hails from the latest evolution of Audi’s widely used EA888 engine. The turbocharged 2.0-litre four-cylinder direct injection petrol unit produces 296bhp, providing it with a specific power output of 149bhp per litre. Torque peaks at 280lb ft on a band of revs from 1800 to 5500rpm, representing a 35bhp and 22lb ft increase on the older EA113 engine used by its predecessor.
The new engine is described as Audi’s most advanced four-cylinder production car engine to date. It runs 1.2 bar of turbocharger boost pressure, twin counterbalancing rotation shafts, a two-stage valve lift system with 30deg of camshaft adjustment on the inlet side and 60deg on the exhaust side, a new injection system to deliver fuel to each cylinder depending on throttle load and a 6800rpm redline. It’s also claimed to weigh 5kg less than the engine it replaces.
As with its predecessor, the new S3 Sportback receives a standard six-speed manual gearbox and Haldex-style multi-plate clutch four-wheel-drive system. A six-speed dual-clutch automatic S-tronic gearbox with remote steering wheel mounted shift paddles continues to be available as an option.
Clothed in a body that uses extensive amounts of aluminium, the new Audi is claimed to possess a kerb weight that undercuts the second-generation model by an impressive 70kg, at 1445kg, providing it with a power-to-weight ratio of 204bhp per tonne.
Audi quotes a 0-62mph time of just 5.0sec with the optional S-tronic gearbox, which includes a launch control system to limit slip under hard acceleration. With the standard six-speed manual, it requires 5.5sec.
These are improvements of 0.6sec and 0.3sec over the first-generation S3 Sportback introduced back in 2008. Top speed in each case is an electronically limited 155mph, or the same as before.
The added performance is achieved with a reduction in fuel consumption; the new S3 returns an official 41mpg on the European test cycle in six-speed S-tronic guise. In six-speed manual form it is rated at 40.4mpg.