Mini Cooper S: overboost to push peak
torque from 240 to 260 Nm.
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.
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 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.
centre speedo now comprises also
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
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.
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
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).
Mini, the second generation, 2007
Mini Cooper, 2007
Mini Cooper S, 2007
Mini specifications, 2007
Mini options, New
Mini brief history.