The Acura RDX is Acura’s first compact luxury crossover SUV. The RDX is powered by Acura’s first turbocharged gasoline engine. The 2.3-liter I4 K23A1 engine has all-aluminum construction, an i-VTEC head, and dual balance shafts. Acura’s variable flow turbocharger reduces turbo lag by using a valve to narrow the exhaust passage at low rpm, increasing the velocity of the exhaust flow and keeping the turbine spinning rapidly. At higher rpm, the valve opens to allow more exhaust flow for increased boost. The engine also features a top-mounted intercooler which receives air from the grille, channeled by ducting under the hood. The Acura RDX engine is rated at 240 bhp (179 kW) @ 6000 rpm with a torque peak of 260 lb·ft (353 N·m). @ 4500. The EPA estimated fuel mileage is 19 city and 23 highway miles per gallon. New more realistic EPA mileage estimates as of February 2007 are 17 city and 22 highway. One professional auto tester averaged 11 city and 17 highway under an admittedly heavy foot. The recommended fuel is premium 91 octane unleaded.
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