The dominant engine layout in the U.S. is the V-6.
Last year, about 44% of the vehicles produced in North America came so equipped, and V-6s beat every other engine layout in terms of total sales.
Strangely, though, there are few V-6s using forced induction to generate big performance. In the U.S., if you want a V-6 with better performance, you buy a V-8.
So it is a special day to see an all-new turbocharged V-6.
Corp.'s 2.8L turbocharged DOHC V-6 – for now used exclusively by its Saab Cars division – has such an engaging all-around performance profile, we wonder why more auto makers do not take a chance on this rare and satisfying format.
For those expecting the super-sized specific-output numbers to which we have become accustomed with forced-induction 4-cyl. engines, this new turbocharged V-6 might appear tame at 89 hp per liter.
But the number surpasses the new wave of high-powered normally aspirated V-6s (Lexus 3.5L V-6 makes 87 hp per liter) that are almost a full liter larger, and it whips most V-8s by a healthy margin.
The low-ish torque figure of 258 lb.-ft. (350 Nm) betrays this engine's comparatively diminutive displacement. But what it lacks in ultimate thrust is compensated for by the delectable torque curve typical of a turbo engine: Every pound-foot of twist is at your disposal from just 2,000 rpm.
On the road, that translates into flexibility normally aspirated V-6s and V-8s cannot replicate.
Hold a gear longer than usual (the standard 6-speed manual is the better choice over the 6-speed automatic, incidentally), and the low-inertia, twin-impeller turbocharger makes haste to dial up maximum torque.
For midrange needs, meanwhile, the combination of six cylinders and turbocharging generates explosive shove.
We would put the Saab 9-3 Aero's in-gear acceleration up against anything in its class, or against anything a class or two above. There are few V-8 sport sedans, for instance, that can run away when the full turbocharged fury of this 2.8L V-6 is deployed.
This engine, based on GM's new “global” V-6 architecture, drastically upgrades the rusty 3L turbocharged V-6 Saab recently dropped from its 9-5 lineup. That engine produced just 200 hp and 229 lb.-ft. (310 Nm) of torque.
Although the new and much more powerful 2.8L V-6 currently is available only for the 9-3 model line, it can be assumed the new turbocharged V-6 will be fitted in the all-new replacement for Saab's 9-5 flagship due in a couple of years.
The GM 2.8L turbocharged DOHC V-6 is a unique and compelling addition to the U.S. powertrain scene. It is a convincing luxury performance engine that reinforces Saab's heritage for leading-edge turbocharged mills.
Winter: Just love the smoothness of this engine.
Banks: Polite and well-mannered. A sophisticated driving experience. A poor man's330i.
Visnic: Hang on for dear life when running to redline in 3rd or 4th gear. Throw in direct injection, and let's really party!
Corp. 2.8L Turbocharged DOHC V-6
Engine type: 2.8L turbocharged DOHC 60° V-6
Displacement (cc): 2,792
Block/head material: aluminum/aluminum
Bore x stroke (mm): 89 x 74.8
Horsepower (SAE net): 250 @ 5,500 rpm
Torque: 258 lb.-ft. (350 Nm) @ 2,000-4,800 rpm
Specific output: 89 hp/L
Compression ratio: 10:1
Fuel economy for tested vehicle (EPA city/highway mpg): 18/28
Application tested: Saab 9-3 Aero