The first ever Acura RDX burst on to the Sport Utility Vehicle scene in 2007. For 2008 the RDX returns with as an advanced 5-passenger Entry Premium SUV with handling and performance that positions it as the SUV soul mate of the Acura TSX sports sedan.
The RDX concept was initiated in California and then developed in Japan. It features precedent-setting engineering features for Acura, including the luxury division's first turbocharged and intercooled engine, the first adaptation of the Super Handling All-Wheel Drive™ (SH-AWD™) system to an SUV, and Acura's first standard 18-inch wheels and tires. Likewise, the RDX continues Acura's "Safety Through Innovation" with the application of cutting edge standard safety technologies. True to form for Acura, the RDX also offers a class-leading array of sophisticated electronic technologies that are seamlessly integrated to keep its passengers informed, in touch and entertained.
Acura's new RDX shares much in concept with the TSX. Though one is an SUV and the other is a sports sedan, both vehicles are designed to blend strong performance with agility and precise handling. The unique positioning of this new Entry Premium SUV within the Acura product line guided the development of a special powertrain for the RDX. A conventional 4-cylinder engine would lack the horsepower and torque needed to make the RDX a strong performer. On the other hand, a 6-cylinder would add extra weight.
A perfect solution came in the form of a turbocharger - a first for an Acura production vehicle. The RDX has an innovative new variable flow turbocharger that overcomes the shortcomings of conventional turbo designs and delivers an unusually broad powerband with little or no lag in throttle response. In addition, Acura's turbo design provides this benefit with high reliability. This is because airflow is controlled before it enters the turbocharger, rather than within the turbocharger as in traditional variable-flow designs. Acura's variable flow turbo design thus eliminates moving components that work directly in the stream of hot exhaust gases.
Architecturally similar to the TSX's 2.4-liter in-line four, the RDX applies a 2.3-liter DOHC 16-valve in-line 4-cylinder engine. Like the TSX, the RDX uses i-VTEC® valve control that combines Variable Valve Timing and Lift Electronic Control (VTEC®) with Variable Timing Control™ (VTC™). With the variable flow turbo working in unison with i-VTEC®, the RDX delivers strong power and torque, excellent fuel economy and very low emissions.
Rated output for the engine is 240 horsepower @ 6000 rpm and 260 lb-ft of torque @ 4500 rpm. That gives it the highest torque output of any engine in the Acura lineup. The RDX is EPA rated at 17/22* city/highway mileage, which puts it ahead of some less powerful SUV competitors.
Source: Acura press