XT trims in models like Subaru Forester bowed out in the last model year. Now, one turbocharged Subaru car and SUV remain: Subaru WRX and the all-new Subaru Ascent. But what is turbocharging? What does a turbocharger do for both power and efficiency? Moreover, why is a turbocharged engine better? The answers to all these questions and more, from the experts here at Subaru Superstore of Chandler.

Disabusing ourselves of fancier terms like "volumetric," Subaru engines with turbocharging do something pretty straightforward. They take the force of their exhaust gases and use it to push additional air into their cylinders. This dramatically improves fuel combustion, given that the amount of oxygen available to "fuel" it increases.

Thus, on the one hand, you get enhanced efficiency. Take the new 2019 Subaru Ascent, for example, our automaker's flagship and largest mid-size SUV.

It features a standard turbocharged 260-horsepower, 2.4-liter SUBARU BOXER engine, capable of shelling out 277 high-performance pound-feet of torque. It's designed "flat" versus in-line, with pistons that move from side to side versus up and down. That means, besides assisting with vehicular balance, more direct and effective power delivery.

Before we begin to believe that high power like this equals more trips to the pump around Chandler, consider that the engine's paired with a Lineartronic® CVT. This kind of transmission, "continuously variable," is belt- versus gear-driven, lighter-weight, and more efficient than a gear-driven automatic when it comes to delivering power. The result show in the SUV's exceptional fuel economy. Expect up to an EPA-estimated 21 city mpg and 27 highway mpg.

On the other hand, you can get a significant bump in "get-up-and-go" as well as acceleratory power. Consider the new 2019 Subaru WRX in this case.

Its STI and STI Limited trims incorporate a turbocharged 310-horsepower, 2.5-liter powerhouse, capable of a beastly 290 pound-feet, and that's thanks to a turbocharger/intercooler combo. Base, Premium, and Limited trims, however, feature a turbocharged 268-horsepower, 2.0-liter engine ready to deliver 258 pound-feet. It's not only the latter group's turbocharger and intercooler but also that's it's "twin-scroll" that helps make the difference in this case. Two turbochargers result in less turbo lag, meaning less time building that necessary boost pressure (anywhere from 14.7 to 16.2 psi, to be exact). In turn, that's more power sooner; in other words, a shorter acceleration time.

Of course, you can still count on respectable on fuel economy for one of the most sought-after adrenalized thrill-rides out there. It's comparable to Ascent, actually: up to 21 mpg city/27 mpg highway with a fully synchronized six-speed manual transmission, according to the EPA.

The best reason to own a turbocharged vehicle, however? Your own -- what it can do for your drive, whether that's the long south-Arizona commute, a weekend getaway into the desert, or a long-planned road trip. Give us a call here at 1050 South Gilbert Road or stop by and see us in-person, and we'll take you for a test drive in the model that catches your eye!