2005 Greater Los
Angeles Auto Show

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MazdaSpeed6
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Click image for larger view

Click image for larger view

By introducing direct injection to turbo applications, Mazda has circumvented the usual drawback of turbocharging – poor low- and mid-range torque – while meeting strict exhaust regulations. By injecting fuel directly into the combustion chamber and allowing it to vaporize under more controlled conditions than in the intake tract, fuel mixture loading efficiency is improved and torque is increased by up to 10 percent at around 3000 rpm over a conventional intake system. Direct injection also yields an internal cooling effect within the combustion chamber, allowing a high 9.5:1 compression ratio. The turbocharger delivers significant boost from the moment the accelerator is engaged at approximately 2500 rpm.

A single-scroll turbocharger, lightweight and simple in construction, allows not only enhanced reliability, but also reduces greatly the required thermal capacity of the exhaust system. In turn, this reduced thermal capacity maintains the overall temperature of exhaust gasses and aids in minimizing catalyst light-off times, helping comply with increasingly strict cold-start and running emission regulations. Injecting atomized fuel directly into the cylinder causes a fine fuel mixture to form around the spark plug, which prevents engine-damaging misfires. The mixture allows a delay in ignition timing without risk of misfire, which also helps maintain exhaust gas temperature. The end result is an impressively efficient catalytic converter that minimizes harmful emissions and allows MAZDASPEED6 to meet both LEV-II state and Bin 5-A Federal regulations.

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Turbocharged. More than 270-horsepower. Stylishly elegant. Separately, each term has the power to stimulate the inner racecar driver in each of us, but together, they establish the newest dimension of Zoom-Zoom. The 2.3-liter, direct-injection turbocharged MAZDASPEED6 is the ultimate MAZDA6, adding a sense of refined bravado to the Mazda family.

With output pegged at 272-horsepower and 280 lb-ft of torque, the six-speed manual transmission MAZDASPEED6 will be the most powerful, fastest and best-handling car ever sold by Mazda in the United States. The MAZDASPEED6 powerplant also enjoys the distinction of being the first gasoline direct-injection turbocharged engine available in the United States — paving the way for many more accolades to the already critically acclaimed MAZDA6 platform.

Mazda engineers began with a clean slate when designing the six-speed manual transmission. Engineers chose gear ratios to exploit the power band of the direct-injection turbocharged engine, allowing low gears for strong acceleration and high overdrive gears for effortless high-speed cruising. To ensure a pleasing balance between responsive shifts and smooth gear changes, and sufficient strength to cope with the power generated throughout each gear, the MAZEDSPEED6 employs triple cone synchronizers for first, second and third gears, with a double cone synchronizer for fourth gear. The synchronizers also help minimize shift effort.

Since 270-plus horsepower through the front wheels would cause inevitable torque steer and difficulty putting power to the ground, the MAZDASPEED6 employs an all-new Active Torque Split All-Wheel Drive system, which yields a superb balance between Zoom-Zoom driving excitement and assured stability under all road conditions. Unlike many competitor offerings, the torque transfer system found in the MAZDASPEED6 — which adjusts front/rear torque distribution between 100:0 and 50:50 for optimum drive power to each wheel — seamlessly integrates the inherent stability of all-wheel drive. Active Torque Coupling is controlled electronically and can react to wheel slippage much more quickly than conventional gear- or fluid-controlled systems.

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