3.5-liter V-6 Engine
The powerful 3.5-liter i-VTEC® V-6 engine produces an impressive 273 horsepower and 251 lbs.-ft. of torque, while the refined Variable Cylinder Management (VCM II) system and low-friction technology produce class-leading efficiency.
- The efficient front-drive model has an EPA fuel economy rating of 20 / 28 / 232 city/highway/combined, while the AWD model does nearly as well with a 19 / 27 / 22 rating.
- VCM II enables cylinders to be shut off at cruising speeds in order to increase highway fuel efficiency. Fuel efficiency is enhanced by lower-friction piston rings, the ability to run on lower viscosity oil and transmission fluid, and other friction-reducing features.
- i-VTEC®, which stands for Variable valve Timing and Electronic lift Control, enables the intake valves to open deeper and longer when the engine reaches approximately 4500 rpm to enhance airflow and allow the RDX to continue to build horsepower at levels where other engines may run out of steam.
- All-aluminum construction, a hollow camshaft, and other weight-saving measures keep the engine lighter for better handling.
- The Drive-by-Wire™ throttle system provides a precise balance of smooth and responsive operation by adjusting throttle sensitivity to varying driving conditions.
Variable Cylinder Management
Variable Cylinder Management automatically changes the V-6 engine to run on six, four or three cylinders, depending on driving conditions, resulting in significantly improved highway fuel efficiency.
- During startup, hard acceleration, hill climbing or when high output is required, the engine operates all six cylinders.
- At high-speed cruising or during moderate acceleration, two cylinders at opposite corners of the engine will switch off, enabling the engine to operate on four cylinders.
- At low-speed cruising on city streets, the engine will shut down one cylinder bank (which has three cylinders on one side of the “V”) and operate on the remaining three cylinders.
- The system monitors throttle position, vehicle speed, engine speed, gear selection and other factors to determine the correct cylinder activation for the operating conditions. The system also monitors catalytic-converter temperature to make sure it remains in the proper range to keep emissions low.
Since performance driving requires precision braking, the RDX features a firm pedal feel with linear response and is backed by 4-channel anti-lock brakes, Electronic Brake Distribution and Brake Assist systems.
- The RDX fills its 18-inch wheels with large 12.3-inch ventilated discs in the front and 12.0-inch solid discs in the rear, which resist brake fade even after continuous hard use.
- Electronic Brake Distribution uses the anti-lock brake sensors to determine the proportion of brake force to be channeled to each wheel for increased performance and stability.
Rigid Body Structure
The less flex there is in the body, the more precisely the suspension can be tuned for an optimal combination of handling and ride. Now, Acura has taken the impressive first-generation RDX body structure a step further.
- Additional reinforcements around the rear-suspension mounting points reduce vertical flex.
- Lateral flex has been reduced through strengthened joints around the front suspension sub-frame mounting.
- Close to 40% of the vehicle’s weight is made up of high-tensile steel, which is lighter and stiffer than conventional structural steel.
Smooth & Quiet Ride
While developing the second-generation RDX, one of our primary goals was to make the vehicle more enjoyable for both driver and passengers by reducing noise, vibration, and harshness.
- A floating front sub-frame structure with heavily reinforced mounting points reduces road noise.
- Thinsulate, an effective noise absorber, has been added to new areas such as the inner fenders, door lighting housings, and spare tire pan to further reduce road noise.
- Michelin Primacy MXM4 tires were also selected for their quiet performance.