The tried-and-trusted six-cylinder fighter engine with twin-turbo has been optimised again in terms of energy output, torque and emissions, for use in a dual new 992 form 911 models – a 911 Carrera S and 911 Carrera 4S. At 331 kW (450 PS; total cycle fuel expenditure 9.0 l/100 km; total cycle CO2 emissions 206 g/km), a powertrain now generates 22 kW (30 PS) and 530 Nm torque, that is accurately 30 Nm some-more than a predecessor. The limit torque lies between 2,300 and 5,000 rpm.
Optimized in terms of energy output, torque and emissions: a six-cylinder fighter engine
This encouragement has been achieved with new concepts from a Porsche engineers and excellent tuning inside a water-cooled fighter engine, as good as several measures around a engine. The communication also enhances revving energy and performance, improves response and torque curve, and not least, increases powertrain stability.
Fine tuning inside a engine
New facilities embody a aluminium crankcase, as good as cylinder heads with flow-optimised estuary and empty ports. To promote a use of VarioCam Plus valve timing technology, a valve rises of a dual estuary valves have been configured to be opposite on any cylinder: an uneven tiny valve lift means that a atmosphere intake is replaced during low speeds and loads into an additional whirl strap to urge blending with a injected fuel, creation a explosion routine some-more robust. The measures revoke expenditure and damaging emissions.
VarioCam Plus: The valve rises have been configured to be opposite on any cylinder
The new approach fuel injection (DFI) complement with piezo injector, that opens outwards and is mainly positioned in a explosion chamber, has a identical effect. These modifications concede a injection valves to open and tighten distant some-more quickly, to supply a finer fuel mist, and to safeguard high-quality placement of really small, accurate quantities, adult to 5 times per explosion cycle.
New turbocharger core
Growth increases energy output. This also relates when it comes to a dual turbochargers of a six-cylinder engine in a eighth-generation 911. The compressor and turbine sides have been stretched and a redesigned turbo plural is now done from expel steel rather than piece metal. In contrariety to a prototype indication a chargers are organised symmetrically, with a compressor and turbine wheels on a right and left horse branch in hostile directions, that optimises a upsurge ratios as good as a charger’s response.
Porsche 911 Carrera S/4S turbocharger
To optimise a empty tract upsurge by a manifold, a empty turbocharger and catalytic converters, a chargers have been organised symmetrically. This takes comment of a parsimonious package conditions customary to sports cars. Electric flaps assistance dilate a opening angle of a wastegate valve, a hole of that has been increased. This is designed to optimise catalytic converter heating. The limit boost vigour is now 1.2 bar.
The totally redesigned and stretched intercoolers also assistance optimise energy output. These are now positioned directly above a engine and therefore mainly underneath a back engine cover, that significantly improves a atmosphere intake and exhaust. This growth has severely softened engine potency and re-cooling. As a outcome of this adjustment, a atmosphere filter, that in a prior era was propitious in this accurate position underneath a back wing, had to be separate into dual and commissioned laterally into a back mudguards.
The 8-speed dual-clutch delivery is designed to safeguard softened change performance
The 8-speed dual-clutch delivery is a totally new underline that is propitious as customary in a 911 Carrera with rear-wheel expostulate and in a Carrera 4S with four-wheel drive. The larger widespread compared with a 7-speed dual-clutch delivery in a 991 is designed to safeguard softened change performance, some-more pushing comfort and larger potency all round.
Harmonious rigging ratio spread
As tip speed is reached in sixth gear, eighth rigging is designed as an additional overdrive to seventh rigging – a magnitude that Porsche engineers have implemented to urge relating of rigging ratio increments and changeable to sixth gear. As such, initial rigging has a shorter rigging ratio, that softened matches revoke gears to a turbocharged engines. Furthermore, a rigging ratio widespread is now distant some-more agreeable and provides another routine around that to revoke consumption. This final pattern is also extended by a regulated oil siphon that controls vigour for all rigging shifts and purchase processes as required, and therefore reduces detriment of power.
To softened coordinate car starting, engine speed has been adopted as a new control parameter in place of a purchase function. A change of control parameters creates for some-more agreeable rigging changing. Shift opening during high speed and loads is softened by use of a “lightning discerning shift” systems informed to drivers of a 991 era of a 911 GT.
These systems are activated when manually changing adult a gears and in involuntary mode when Sport Plus mode is active, and they have been serve optimised compared with their predecessors. Our engineers have commissioned an additional “filling bypass” in a purchase hydraulics and have blending a program control accordingly. This ensures a new 911 Carrera is really discerning off a mark, with a speed of 0-100 km/h in 3.5 seconds (911 Carrera S) or 3.4 seconds (911 Carrera 4S) – creation these models 0.4 seconds faster than their homogeneous predecessors.
Porsche 911 Carrera S/4S empty complement with gasoline particulate filter
A new underline of a eighth-generation 911 is a gasoline particulate filter (GPF), a technical creation that creates a 992 and all other Porsche explosion engines to come, future-fit in terms of empty emissions. It uses enclosed ceramic filters. Exhaust gases are fed by alternately hermetic channels, forcing a gas to upsurge by a walls of a particulate filter. The particulates are afterwards burnt off in an involuntary metamorphosis process.
Text initial published in “Automobil Produktion” – Special book 2018 “Der neue Porsche 911”
911 Carrera S: Fuel expenditure total 8.9 l/100 km, CO2 emissions total 205 g/km
911 Carrera 4S: Fuel expenditure total 9.0 l/100 km, CO2 emissions total 206 g/km