While direct injection frequently is referred to as the wave of the future, the Pentastar’s chief engineer says new particulate emissions standards will have auto makers shifting back to port injection.
Despite 278 eager horses, editors logged 29.4 mpg – well above its 25-mpg combined rating. In an era when many auto makers are being hammered for not coming close to their official fuel-economy ratings, this is exceptional.
Audi’s only gasoline V-6 as of the ’13 model year powers the A6 and A7 4-door "coupe," the high-performance S4 sedan and Cabriolet and S5 coupe, as well as the Q5 and Q7 CUVs and the ’13 A8 luxury sedan. It also can be found in the VW Touareg and two Porsches.
Without 2-step variable valve lift, the ’15 version of the Pentastar always operated in high-lift mode, consuming more fuel. FCA says the new system results in less overall pumping work, singlehandedly accounting for a fuel-economy gain of up to 2.7%....More
Drivers may hear the self-cleaning taking place during a hot idle, and the process could last from 10 seconds to as long as 10 minutes, depending on driving patterns and the amount of build-up on the injectors....More