The Acura RDX is Acura's first compact crossover SUV, taking over from the MDX as Acura's entry-level crossover SUV, as the MDX grew in size and price. Although the dimensions of the vehicle are similar to that of the Honda CR-V, the RDX uses a unique platform developed to handle the vehicle's advanced all-wheel drive system. Originally previewed as the Acura RD-X concept car, the production RDX had its debut at the 2006 New York Auto Show and went on sale on August 11, 2006. A facelifted 2010 model went on sale in August 2009, adopting Acura's power plenum grille seen on its sedan models. Front-wheel drive was also added. The RDX is powered by one of Honda's very few turbocharged gasoline engines. The 2.3-litre straight-4 K23A1 engine has all-aluminum construction, an i-VTEC head, and dual balance shafts. It is also one of the first and only four-cylinder powered luxury SUVs. Honda'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
Contributions by Bull-Doser, Typ932, and Xjuicer.