Lexis-IS-200t-1


Η Lexus μετά την τοποθέτηση του 2,0-λίτρου turbo κινητήρα βενζίνης στο RX 200t F Sport, ανακοίνωσε ότι με το νέο αυτό κινητήρα θα είναι διαθέσιμο και το IS.

Το ονομάζει IS 200t και θα είναι διαθέσιμο από το ερχόμενο φθινόπωρο. Το τετρακύλινδρο σύνολο αποδίδει 245 άλογα και 350 Nm ροπή. Ο κινητήρας διαθέτει έναν twin-scroll turbo, το σύστημα ψεκασμού της Toyota, D-4ST, ευφυή μεταβλητό χρονισμό βαλβίδων, τουρμπίνα χαμηλής αδράνειας και συνεργάζεται με το νέο 8-τάχυτο Sport Direct Shift αυτόματο κιβώτιο. Είναι το πρώτο αυτοκίνητο που φοράει αυτό το κιβώτιο και διαθέτει paddles στο τιμόνι, ενώ αλλάζει το χρόνο αλλαγής των σχέσεων ανάλογα με τις δυνάμεις G. Επιταχύνει από τα 0-100 χλμ/ώρα σε 7 δευτ., ενώ η τελική του ταχύτητα φτάνει τα 230 χλμ/ώρα. Τέλος, η ιαπωνική εταιρία ανακοινώνει ότι έχει μέση κατανάλωση 7 λίτρα/100 χλμ.

Lexis-IS-200t-8

Σύμφωνα με την ιαπωνική εταιρεία:

Το κιβώτιο “κατεβάζει” αυτόματα κατά το απότομο φρενάρισμα πριν από μια στροφή, έπειτα κρατάει τη χαμηλότερη σχέση μέσα στη στροφή για καλύτερο έλεγχο και στη συνέχεια στην έξοδο επιλέγει την πιο κατάλληλη σχέση για να προσφέρει στον οδηγό μεγαλύτερη απόκριση στο γκάζι.

Δελτίο Τύπου

LEXUS TO LAUNCH IS 200t WITH INNOVATIVE 2.0l TURBO PETROL ENGINE

  • New turbo engine offers superior smoothness and responsiveness, with no turbo-lag and high fuel efficiency
  • Engine mated to 8-speed Sport Direct Shift transmission
  • IS 200t on sale in Europe as from September 2015

Brussels, Belgium – Lexus is expanding the range of vehicle equipped with its new 2.0-litre turbo engine. Following the launch of NX 200t in early 2015 and the announced arrival of RX 200t by the end of the year, IS is the third Lexus model to be fitted with this new engine.

Powered by a new 2.0-litre petrol turbo engine – with innovative D-4ST fuel injection technology for both fuel economy and instantaneous torque – the Lexus IS 200t sports sedan delivers 245 DIN hp (180kW) with a maximum torque of 350 Nm. Capable of rapid acceleration up to a top speed of 230 km/h, its 8-speed Sport Direct Shift transmission was developed for the high-performance RC F.

Featuring a breakthrough combination of water-cooled cylinder head, integrated exhaust manifold and twin scroll turbocharger, this all-new Lexus 2.0-litre turbo engine delivers fast throttle response, performance and high torque at low engine revs. For enhanced fuel economy, innovative valve timing (VVT-iW: Variable Valve Timing intelligent – Wide) allows the engine to switch between the Otto and Atkinson cycles.

The IS 200t returns a 0-100 km/h acceleration time of 7.0 seconds and an average fuel consumption of 7.0l/100 km.

Cylinder Head with Integral 4-into-2 Exhaust Manifold and Twin-Scroll Turbo

This innovative, combination of engine technologies has been designed to provide a high level of responsiveness with minimal turbo lag and enhanced low speed torque, and yet return an improved fuel economy.

The four-into-two exhaust manifold system pairs cylinders according to their expansion or compression stroke. Acting in conjunction with the highly-efficient, twin-scroll turbocharger, this innovative manifold structure prevents interference between the exhaust gasses from each cylinder, generating high torque across the widest possible rev range.

The engine further employs an air to liquid intercooler mounted directly to the engine to significantly reduce the intake volume downstream of the turbocharger, minimising turbo lag for a highly responsive performance.

The twin-scroll turbocharger itself features variable waste gate valve control. This minimises pumping losses by reducing back pressure during low engine loads when the turbo is not required realising good fuel economy.

In addition, the integration of the exhaust manifold within the cylinder head enhances exhaust gas cooling without sacrificing catalyst warm-up performance. This not only helps to suppress catalyst deterioration, but also expands driving range at the optimum, stoichiometric air-fuel ratio.

D-4ST Fuel Injection System

D-4ST (Direct injection 4 stroke gasoline engine Superior version with Turbo) combines a high pressure fuel system for injection directly into the cylinders with a low pressure system for injection into the ports. Injection is split between the direct and port injectors according to the engine load, optimising fuel combustion in all driving situations to enhance both low speed torque and fuel economy.

This advanced fuel injection system works in combination with turbocharging technology to create a high level of compatibility between the ‘high tumble ratio’ achieved by optimising the shape of the cylinder head intake ports and the piston tops, and turbo ‘boost control’.

Innovative Dual VVT-iW Technology

Optimising torque throughout the engine rev range and allowing the engine to start in the Otto cycle and yet run in the more fuel efficient Atkinson cycle, the new Lexus turbo features innovative dual variable valve timing technology which adopts VVT-i to the exhaust valves and VVT-iW to the intake valves, but also delivers wide open throttle performance.

The late intake valve closing of the Atkinson cycle reduces pumping losses and boosts fuel economy. VVT-iW incorporates a mid-position lock which not only enables the Atkinson cycle to be maintained without sacrificing starting performance in cold weather.

Further Advanced Features

The new 2.0 litre turbo engine is remarkably light and compact. Cast with low nickel content heat resistant steel, and featuring a resin cylinder head cover, intake manifold and intake pipes, it weighs just 160 kg. The unit was bench-tested for more than 10,000 hours before extensive on-road testing began, during which it then covering more than one million kilometres.

Several measures have been adopted to reduce friction losses within various parts of the engine, enhancing fuel economy. The adoption of an offset crankshaft lowers the piston thrust load to reduce friction losses. Cylinder bore machining has been improved and a piston surface treatment applied to the piston skirts, reducing sliding resistance. Low tension piston rings have been used, and the weight of reciprocating parts reduced.

A lightweight roller rocker valve train and a low friction timing chain have been adopted, and the sliding parts of the chain fabricated in a low friction material. Low friction materials have also been used for the crankshaft oil seals, and the flow of lubricating oil optimised, with oil pump flow reduced through the adoption of a variable discharge mechanism.

Careful heat management within the engine further improves fuel efficiency. To that end, a cylinder block rapid warm-up system suppresses the flow of coolant into the block when the engine is cold, and a piston cooling oil jet control system cuts the supply of oil to the pistons to improve warm-up speeds.

Smoothness, Quietness and a Better Turbo Sound

With the rigidity of the main structural components already optimised to suppress vibration, the new engine is further equipped with a balance shaft featuring resin gears for even greater smoothness.

Newly developed lubricating calcium free oil removes the chance of engine knock at low engine revolutions, and the piston cooling oil jet system further improves anti-knock performance.

The water-cooled intercooler provides strong advantages in starting off acceleration and a 0.3-second reduction in 0–100km/h acceleration time over an air-to-air type alternative. The acceleration curve prioritises torque delivery at low speeds.

Turbo engines tend to be noisy when the throttle is closed (referred to as the ‘turbo sigh’). An electric air bypass valve and resonator have been adopted to greatly reduce characteristic turbocharger noise. As a turbocharged engine requires smooth intake flow for performance, Lexus engineers focused on creating special duct shapes which deliver power without noise.

Eight-speed transmission with paddle shifts

The IS 200t also received the 8-Speed Sport Direct Shift transmission with paddle shifts, originally developed for the RC F high-performance coupe. The rear wheel drive IS 200t is the first Lexus sedan to vary gear shifting in accordance to G-forces.

The transmission automatically downshifts during hard braking before a corner then holds a lower gear through the corner for best control and then selects the most suitable gear on corner exit to give the driver greater throttle response.

The IS 200t will be available as from September 2015.

IS 200t – TECHNICAL DATA

ENGINE

Maximum Output DIN hp / kW 245 / 180

Capacity (cm) / Cylinders / Valves 1998 / L4 / 16

Valve mechanism Dual VVT-i

Fuel type / Octane rating Petrol / 95 or +

Max. power (DIN hp / kW @ rpm) 245 / 180 @ 5800

Max. torque (Nm @ rpm) 350 @ 1650-4400

TRANSMISSION

Driven wheels Rear-wheel drive

Transmission 8-speed Sport Direct Shift automatic

PERFORMANCE

Max. speed (km/h) 230

0-100 km/h (s) 7.0

EMISSIONS* (g/km)

Emissions level Euro 6

CO2Combined 162 (with 17”wheels) / 167 (with 18”wheels)

FUEL CONSUMPTION* (l/100 km)

Combined 7.0 (with 17”wheels) / 7.2 (with 18”wheels)

BRAKES

Front and rear Ventilated discs

SUSPENSION

Front Double wishbone

Rear Multi-link

STEERING

Type Rack and pinion

Turns (lock to lock) 2.84

Min. turning radius (m) 5.2

WEIGHTS (kg)

Gross vehicle 2125

Kerb (min. – max.) 1590-1680

Towing (max. with / without brakes) 1500 / 750

DRAG COEFFICIENT

Cd value 0.28

CAPACITIES (l)

Fuel tank 66

Luggage compartment 480