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2018 Buick Enclave: How engineers made it larger, lighter, more sophisticated

Buick used the unveiling of the 2018 Enclave at the New York Auto Show to introduce its new range-topping Avenir sub-brand to the world. With fancier interior finishes and exterior details, it's Buick's latest effort to make itself a proper luxury brand (or perhaps re-establish itself as such). However, lost in the Avenir song and dance is the fact that the 2018 Buick Enclave is a (very) long-awaited all-new model regardless of the trim level one selects. Like the Chevrolet Traverse upon which it is based, the new Enclave is bigger than the vehicle it replaces but considerably lighter, by about 400 pounds. "We told every engineer, 'get your job done, but then take the weight out,'" said engineer Rick Spina as we hovered next to his larger yet lighter creation. His team therefore set about taking a little bit of weight out from just about everywhere, from using additional aluminum in the suspension to varying the thickness of the frame (thicker in places that needed to be stronger, thinner and therefore lighter in places that didn't). Only about 100 pounds came out of the body with the rest coming from elsewhere. Not only will the reduced weight improve fuel economy (Buick-estimated at 19 mpg combined with FWD versus 18 for the 2017 model) and presumably the old Enclave's rather ponderous handling, but it should only make things easier for the new powertrain: General Motors' now-familiar 3.6-liter V6 and its latest nine-speed automatic. With 302 horsepower and 260 pound-feet of torque, Buick says the new engine will need 7.2 seconds to reach 60 mph with FWD or 7.5 seconds with AWD. That's a second quicker than before. Besides acceleration, towing is also bumped up by 500 pounds to 5,000. For those models with all-wheel drive, the Enclave has the same basic system featured on range-topping versions of the Buick LaCrosse. Besides power being sent front and rear, it can also differ from right to left in the back, although Spina is quick to point out that capability is for traction-enhancing purposes rather than sporty, handling-enhancing torque-vectoring ones. Buick owners already appreciated the Enclave for its quietness so the engineers decided to take it that much further. This included altering the exhaust, improving body sealing (there are triple door seals), including active sound deadening and utilizing advanced materials that absorb sound as opposed to simply being thick, dense and heavy enough to keep it out.

2017 Buick LaCrosse an evolution of sharp Avenir concept

After years as a bloated, uninspiring, but comfortable near-premium sedan, Buick has taken the wraps off a leaner, lither, far more stylish LaCrosse. The third-generation model has just made its debut at the 2015 Los Angeles Motor Show. While there's a lot to talk about, let's first address the new, Avenir-inspired sheetmetal. The fascia is basically the concept car smoothed over into production form, featuring the same winged trishield. In place of the chrome-trimmed waterfall, the LaCrosse gets a blacked-out, recessed grille with a chrome surround. It looks good in photos but it's better in person, adding a real sense of complexity and depth to the front end. The headlights and lower fascia, meanwhile, adhere closely to the concept. The same cannot be said of the LaCrosse's tail. While the taillight lighting pattern is similar, the overall shape of the lighting element is radically different, refining the design featured on the back of the Regal. Also gone, sadly, is the Avenir's boattail rear deck. Instead, the LaCrosse gets a small rear deck that curves up into a pleasant duckbill spoiler. The rest of the tail is pleasantly restrained. Perhaps the weakest point is the profile, where Buick has instituted a "split-spear" design, featuring a strong shoulder line above the rear wheel well, which sits below an even stronger character line that curves down and towards the front of the car. It strikes us as just a little too much, like the Impala. Underneath that sheetmetal, Buick has managed to trim nearly 300 pounds of body fat, nearly half of which came from the vehicle's actual structure. That 300 lbs, according to Buick's engineers, is equivalent to a Kenmore side-by-side refrigerator, in case you needed a helpful comparison. Despite the weight savings, Buick has upped the torsional rigidity for this new model by 15 percent. The LaCrosse's cabin features a strong, cockpit-like design, with a high, floating-bridge center console. This is possible due to Buick's adaption of the Electronic Precision Shift system, introduced earlier this month on the new Cadillac XT5. Despite the new-fangled console design, Buick's retained the wraparound cabin style introduced on the second-gen model. Based on a quick crawl around the interior, space is great in front, although ingress in back is somewhat difficult due to the roofline. You're probably wondering why we haven't said anything about the mechanicals just yet.

New Takata problem results in recall of 414 GM vehicles

An airbag-inflator rupture discovered by Takata during testing has resulted in a new recall affecting 414 vehicles from General Motors, including 395 of them in the US. This latest campaign covers 2015 model-year examples of the Buick LaCrosse, Cadillac XTS, Chevrolet Camaro, Equinox, Malibu, and GMC Terrain. There are no reported breaks in any of these vehicles on the road, and the company estimates only one percent of them actually have the faulty parts. According to documents submitted to the National Highway Traffic Safety Administration (as a PDF), one side-airbag inflator failed a cold test at -40 Fahrenheit "releasing high pressure gas and propelling the separated components apart." The supplier told GM about the failure the next day. In these vehicles, the safety device might not only burst but the bag could inflate incorrectly, as well. GM and Takata say that a cause is not yet known, but they are "conducting an investigation." GM will begin notifying affected owners via overnight mail on Oct. 19. Dealers will replace the side airbag modules on all of the affected vehicles with new components outside of the suspect lot. All of the removed parts will also be collected for further study. Takata's faulty front airbag inflators have resulted in a serious scandal for the supplier. Initial figures indicated 34 million US vehicles are need of repair, though more recent figures have knocked that down to 23.4 million bad parts in 19.2 million automobiles. GM was already among the dozen automakers with models to fix, and some of its pickups were affected, along with the Saab 9-2X and Pontiac Vibe. GM Statement: General Motors is recalling 395 cars and crossovers in the U.S. because one of the front seat side air bags inflators may be defective. In the event of a deployment, the air bag's inflator may rupture and the air bag may not properly inflate. The rupture could cause metal fragments to strike the vehicle occupants, potentially resulting in serious injury or death. GM is unaware of any incidents involving vehicles with these components, which were part of a lot in which one inflator failed acceptance testing at the supplier. Dealers will replace the side air bag module or modules in affected vehicles. Including Canada, Mexico and exports, the total population of the recall is 414, GM estimates 1 percent of the recalled vehicles may have the defect.