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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.

Buick picks top 11 highlights from first 11 decades

Buick has taken the time to highlight some of the company's personal points of pride from the past 110 years. Those include everything from the automaker's very first vehicle, the 1904 Model B, to what Buick claims is the world's first concept car: The 1938 Y Job (above). That one also walked away with the worst name for a design study.
All told, the automaker has sold 43 million vehicles through the end of last year, and those include the lusty 1963 Riviera. That model celebrates its 50th anniversary in 2013, and remains one of the brand's most iconic designs.
Of course, Buick is rightfully proud of its quickest model, too. The 1987 GNX managed a 4.6-second bolt to 60 mph in tests by Car and Driver, and it also took the honor of being one of the automaker's rarest creations at just 547 units. You can check out all 10 in the gallery above.

GM recalls over 230,000 more Trailblazer-family SUVs over door electronics

Back in August, the National Highway Traffic Safety Administration announced a recall on the General Motors GMT360 SUVs (Buick Rainier, Chevrolet Trailblazer, GMC Envoy, Isuzu Ascender and Saab 9-7X) ranging from the 2005 to 2007 model years and the 2006 GMT370 SUVs (Chevrolet Trailblazer EXT and GMC Envoy XL) due to potential fires associated with the driver's door module. Initially limited to 250,000 units sold or registered in 20 Snow Belt states (and the District of Columbia), the recall has now been expanded to include an additional 193,000 of these SUVs in the US and, according to The Detroit News, 40,000 more sold outside the US, including Canada and Mexico.
Like the original recall, the issue is still a faulty driver's door module that can short out, which could lead to a fire. The Detroit News is reporting that, out of the 443,000 units being recalled, GM says that there were 58 fires that caused 11 minor injuries, and the expanded recall accounted for six fires and one injury. Despite the lower number of fires, the recall notice recommends that owners park their vehicles until the recall repairs has been performed.
On recalled units with functional modules, the repair consists of a protective coating being applied to the module, while vehicles with modules that are not working properly will have the driver's door module replaced. The official recall notice is posted below, and it includes contact information for customers of all five brands.