From Infiniti press: The third generation Infiniti Q45, completely redesigned for the 2002 model year, enters 2003 with two dozen enhancements to its flagship combination of exciting performance, dramatic styling, luxurious interior and innovative technology. The refinements include a higher numerical final drive gear ratio for a better acceleration feel, revised grille and rear finisher appearance, new exterior colors, the addition of standard heated seats and full-size spare tire, available integrated satellite radio and new optional equipment packages.
These changes are in addition to the Q45’s already impressive list of available performance and technology features, including a 340-horsepower V8 engine, voice-activated controls, an LCD information display screen, RearView monitor and one of the most powerful headlight systems in the world.
While the styling of the 2003 Q45 gives a strong impression of performance, it’s what is under the hood that delivers on the promise. Standard on every Q45 is a 340-horsepower VK45DE 4.5-liter V8 with 333 lb-ft of torque – more horsepower than most V8 competitors such as the Lexus LS430, Mercedes E430 and BMW 540 and 745 sedans.
The VK45DE is based on technology used in the award-winning VQ-series V6 engines found in the Infiniti G35, I35 and QX4 and features technology developed from years of research and racing experience. Titanium valves, modular cylinder heads, microfinished crankshaft, lightweight pistons, super-silent single stage cam drive chain and a hydraulically driven cooling fan are all optimized for maximum performance while maintaining low noise levels.
In addition, the VK45DE is outfitted with a variable length air induction system and Continuously Variable Valve Timing Control System (CVTCS) to enhance the engine’s power delivery and operation efficiency.
The exceptional power of the 4.5-liter V8 is channeled through a high-torque capacity, electronically controlled 5-speed automatic with a manual shift mode. For 2003, a new, higher numerical final drive gear ratio of 3.133:1 is utilized for better acceleration feel.
An Electronic Torque-Demand Powertrain Control system manages engine power, throttle position, and the transmission gear selections to optimize smoothness and performance.