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New Mini Cooper S in its 2nd generation

2007 Mini Cooper S: front view, driving shot.

2007 Mini Cooper S: overboost to push peak torque from 240 to 260 Nm.

APN,
9 November 2006.

At £15,995 (UK on-the-road prices), the new Mini Cooper S introduces turbo power to the Mini family. Dropping the supercharger technology of the first generation new Mini, the four-cylinder Hams Hall direct injection engine (developed in cooperation between BMW and PSA, Peugeot-Citroën) produces 175 hp (up five) at 5,500 rpm, and peak torque of 240 Nm (up 20) between 1,600 and 5,000 rpm.

An ‘overboost’ system pushes the 240 to 260 Nm under hard acceleration. Infinitely variable valve timing manages engine output and torque while minimising fuel consumption and emissions. The twin-scroll turbocharger splits exhaust gases and forces them through two cylinders each, contributing to limited lag, and sharp acceleration.

2007 Mini Cooper S: dashboard, side view.

The new Mini Cooper S introduces turbo power to the Mini family.

Besides the Valvetronic system, the new engine in the Mini Cooper S (and Cooper), is turned 180 degrees compared to the engine in the outgoing Mini, with the exhaust now at the front of the powerplant.

The engine in the Mini Cooper S adds its own highlights with the outlet valves filled with sodium to fulfil the higher cooling requirements of the turbocharger, and the intake camshaft features infinite phase adjustment that balances valve timing to required power.

2007 Mini Cooper S: the centre speedo comprises entertainment functions.

The centre speedo now comprises also entertainment functions.

The common rail direct injection system is pressurised by a high pressure pump at the rear of the intake camshaft. Fuel from the common rail is pumped into the combustion chambers through the injection valves in the side of the cylinder heads at the exact time and in the exact amount required.

The pistons are cooled by splash oil during the process that works under an extremely high compression ratio of 10.5:1 (high for a turbocharged engine).

The twin-scroll system allows a spontaneous build-up of power as the ducts of each pair of cylinders are separated from each other in the exhaust manifold. This helps reduce exhaust gas counter pressures at low engine speeds, produces more efficient use of the movement of gas through the manifold and, subsequently, makes the turbocharger’s response more immediate as its rotor blades develop optimum momentum virtually from start-up.

With a wastegate limiting charge pressure to just 0.8 bar at only 1,400 rpm, turbo lag is virtually eradicated. The system contributes to a specific output of almost 110hp per litre.

The 0 – 62 mph (0-100 km/h) sprint takes 7.1 seconds and combined fuel consumption is 40.9 Imp. mpg (34.08 US mpg, 6.9 litres/ 100 km), some 25 per cent better than the previous supercharged version, while emissions levels of 164 g/km contribute to a position of tax band D for VED.

The 50-to-75 mph (80-120 km/h) takes 5.5 seconds in fourth gear.

Transmission options are the same as on the Cooper, with the sporty auto coming through in Spring 2007.

2007 Mini Cooper S: back view.

The Mini Cooper S standard specifications add 16” light alloy wheels.

The Cooper S is specified with bespoke spring and damper settings for a more dynamic drive. An optional sports suspension adds firmer springs and dampers and anti-roll bars, and the Sports button (standard) offers sharper steering and a more immediate throttle response, plus faster shifts on the automatic transmission.

The same Sports suspension option can also be added to the Cooper, but the Sports button remains a Cooper S exclusivity, together with the standard leather twin-spoke steering wheel and Automatic Stability Control + Traction (ASC+T).

The Mini Cooper S standard specifications add (compared to the Mini Cooper version) 16” light alloy wheels (S Winder), twin scroll turbo charger, Sport button, engine scoop in body colour, honeycomb radiator grille, tailgate handle in body colour, chrome–plated fuel filler cap, chrome-plated side indicator grilles with ‘S’ logo, specific Cooper S roof spoiler in roof colour, leather steering wheel and gear knob, pedals and footrest covers in stainless steel, sport front and rear bumpers, front sport seats, twin chrome exhaust pipe, white indicators and 195/55 R16 V run-flat tyres instead of the Mini Mobility System. In the event of a puncture, run-flat tyres allow drivers to continue their journey for 90 miles (145 km) at speeds of up to 50mph (80 km/h).

More: New Mini, the second generation, 2007 Mini Cooper, 2007 Mini Cooper S, 2007 Mini specifications, 2007 Mini options, New Mini brief history.

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