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2012 Buick LaCrosse Gets Upgraded 303-HP LFX V-6: Video

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General Motors has done a lot with its latest 3.6-liter V-6, including boosting the power output to 323 horsepower in the 2012 Chevrolet Camaro. For the 2012 model year, the Buick LaCrosse gets a similar, if smaller, boost to 303 horsepower, up 23 ponies from last year.

Along with the improved power, the V-6 LaCrosse retains its previous fuel economy rating of 17/27 mpg. Best of all for power-lovers, the new V-6 is available as a no-cost alternative to the 2.4-liter eAssist powertrain on several models.

So how did GM tweak the V-6 to get more power without using more fuel? Ligther weight components, larger intake valves, longer-duration camshafts, and a careful tuning process. Also new for 2012 is a quiter direct-injection fuel system, with a new pump and fuel rail. Total weight savings on the new engine amounts to over 20 pounds, most of which is achieved with an integrated cylinder head/manifold combination, described in detail in the video below.

The 2012 Buick LaCrosse will arrive at dealers later this summer.

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Comments (3)
  1. 303hp, a 23hp increment from last year, is great news. However, retaining the same mpg rate with an increase in power is debatable. I dare to say impossible for it violates the laws of physics. Here are two ways this can be digested: 1. the increase in power comes from turbos and the fuel testing takes place under lab conditions i.e. on a Dino, at a steady 40mph when the turbos are not activated (this is not real life driving, and 2. Cylinder deactivation, which is like changing your engine to a new one. The proposition "more power and less fuel usage" for the same engine is impossible
     
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  2. Buick truly has the G37 in the cross-hairs.
     
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  3. Adalberto for your own good, don't post nonsense like this... Have you ever heard the expression "Keep your mouth shut and let others think your are a fool, or open it and remove all doubt"?
    There are no laws of physics being violated. No IC engine operates at 100% efficiency (or anywhere near that) so this revision simply increases efficiency by some measure. Variables like increased spark advance and cam timing can increase power and fuel economy simultainiously, and with the proper engine management software, will do so without any downsides.
    Go back to complaining about gloss-levels on plastic trim, or keep telling the world why you don't like a Chrysler Sebring. Leave the real issues for the grown-folk to discuss.
     
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