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The All-New 2015 WRX: A Technological Triumph
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“It has always been a great driving car. And THIS one – the 2015 model – will take the WRX nameplate to a new level.”

– Subaru of America, Inc. President and Chief Operating Officer Thomas J. Doll

Precision isn’t just a word. For designers of the new 2015 Subaru WRX, it was a mantra. Throwing off the constraints of tradition, our engineers set out to create a sport sedan that embodies the performance prowess and aesthetic impact worthy of the iconic WRX name. 

  

The result is nothing short of extraordinary: simply the best-handling, best-performing WRX ever – and a major evolutionary step for the rally-bred performance car that has become a global automotive legend. 

 

This technology overview focuses on its performance attributes – ones that promise to sustain the WRX legend.

 

 

  

 

 

Engine/Tranny

 

Complementary Engine Technology – Direct Injection

 

Direct Injection (DI) is becoming more common as a highly efficient means of delivering fuel. With DI technology, fuel is injected directly into the cylinder, making it possible to cool the interior of the combustion chamber using the latent heat of fuel vaporization.

 

Optimal air mixture for combustion near the plug is promoted using DI technology. Even when the overall air-fuel ratio inside the cylinder is low, combustion can be better controlled.

 

The benefit? The catalyst heats more quickly during warm-up, reducing the amount of exhaust gas emitted into the air.

Boosted Boxer The heart of any high-performance machine lies under the hood, and the new WRX is no exception. A 2.0-liter, 4-cylinder SUBARU BOXER engine propels the WRX with authority. 

 

Changes to the engine in the WRX include stiffer valve springs and friction-reducing roller rocker arms in place of flat tappets. Those are combined with direct injection, high compression (10.6:1), Subaru Dual Active Valve Control System, a twin-scroll turbocharger, and an intercooler. As a result, the turbo boxer unleashes 268 hp at 5,600 rpm, accompanied by a broad torque curve that peaks at 258 lb-ft over a 2,000-5,200 rpm engine-speed range. This is an increase of 3 hp and 14 lb-ft of torque over the previous-gen model’s 2.5-liter turbo. 

 

 

Six Standard Speeds, One Driver An exhilarating sports car experience lies in your hands. An all-new 6-speed manual transmission – the first-ever application in the WRX – is standard, and it complements the SUBARU BOXER turbo powerhouse. 

 

The new 6-speed features a wider ratio spread than the previous 5-speed and incorporates several performance and durability improvements for this high-performance application. These include carbon synchronizers for first and second gears and a cable-shift linkage for smooth transitions during both upshifts and downshifts. 

 

 

Two Types of Symmetrical AWD

 

Subaru Continuous AWD: A viscous coupling locking the center differential nominally distributes torque 50/50 front to rear, and Vehicle Dynamics Control (VDC) provides stability and traction control. Should slippage occur, this system transfers more power to the wheels with the best traction. When equipped with the 6-speed manual, the 2015 WRX has the Subaru Continuous AWD version of Symmetrical All-Wheel Drive.

 

Variable Torque Distribution (VTD) AWD: It utilizes a planetary gear-type center differential and an electronically controlled hydraulic transfer clutch to distribute torque. That allows for improved cornering speeds and handling. In most situations, the VTD splits torque 45/55 for a rear torque bias and better handling agility. The system constantly adjusts torque distribution based on driving conditions and input from steering wheel angle, yaw, and lateral g-force sensors. Sport Lineartronic CVT models are equipped exclusively with VTD AWD.

Another Way of Getting Power to the Pavement Introducing the new optional automatic transmission for WRX – the Sport Lineartronic CVT. It combines the benefits of a CVT (high fuel efficiency, ultra-smooth driving characteristics) with the choice of stepped automatic shifting. The driver also has paddle shifters for choosing electronically controlled steps (simulating gears).

 

CVT-equipped models also feature Subaru Intelligent Drive (SI-DRIVE), a powertrain performance management system that allows the driver to tailor the vehicle’s driving characteristics by choosing from among three selectable modes – Intelligent, Sport, and Sport Sharp. 

 

Intelligent mode is programmed for the greatest fuel economy of the three.

 

In Sport mode, the CVT can be operated via the steering wheel paddles as a six-ratio automatic (or it automatically switches from continual variance into an electronically controlled six-step mode if you apply more than 30 percent throttle). 

 

With the focus on response, Sport Sharp mode tweaks the engine to its maximum potential. In this mode, the engine responds more directly to the accelerator and delivers a sensation of powerful acceleration – in eight electronically controlled steps!

 

 

 

 

 

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