Auto blog

Why an independent rear suspension for GM's new, full-sized SUVs wasn't easy

A Motor Trend report last month laid out how Cadillac's 4.2-lier twin-turbo Blackwing V8 could be an orphan due to cost concerns in the GM empire. Last-minute chassis changes to Cadillac's new sedans and XT6 crossover led to engine bays that couldn't fit the Blackwing. On the SUV side, according to the report, the new independent rear suspension for big people haulers cost so much to implement that GM ruled out reworking the Escalade to accept the Blackwing. At least one commenter rightly asked how could a suspension swallow that much money. A new piece in Motor Trend has the answer. The excellent Alissa Priddle spoke to Tim Herrick, GM's executive chief engineer for full-size trucks, about why the clean-sheet IRS cost "multimillions of dollars."  First, GM would need to build a new body shop at the Arlington, Texas plant that assembles the automaker's big SUVs to stamp the numerous wholly new parts and panels accommodating an IRS. Then GM would need to design and pay for a new assembly process. On top of those up-front costs, there was the incremental cost of the four-link IRS components being more expensive than those in the trucks' former leaf-sprung solid axles. Herrick endured so many rejections for so long that he remembers the date and time when he got approval for the new unit. He said it came down to a meeting where he told a higher-up, "I'll make you a deal: If we get to the reveal, or if we launch this and you think this was a dumb idea, I'll hand you my badge and let you walk me out." Head to Motor Trend to read the full story. Based on Herrick being on stage to help present the new SUVs to the press, and on our First Ride in the new Chevrolet Tahoe and Suburban at GM's Milford Proving Grounds, it appears this will have a happy ending for all involved. Furthermore, since Herrick worked on the T1 platform that supports the big SUVs as well as the light- and heavy-duty pickups, he understood the demands on the commercial side, too. That could be why when Roadshow asked Tim Asoklis, chief engineer of the Tahoe and Suburban, if the new IRS could endure life in the Chevrolet Silverado and GMC Sierra, Asoklis answered, "Oh, absolutely." Related Video:    

Deep discounts — $12K, $13K, $16K — are fueling a pickup price war

Heavy discounts of up to $16,000 per vehicle are fueling a "truck war" among full-size pickups sold in the United States by the Detroit Three, a Reuters analysis shows. Strong U.S. sales this year of the highly profitable big trucks have helped offset lagging passenger car sales. But it is not clear how much of the truck demand is linked directly to ample factory incentives and dealer discounts, or how far sales might decline without those subsidies. A Reuters survey of Ford, General Motors Co's Chevrolet and Fiat Chrysler Automobiles's Ram truck dealers across the United States indicates stores are offering deep discounts the country's bestselling full-size pickup trucks. "The walls are not crashing down on full-size trucks," said Sam Fiorani, vice president of global vehicle forecasting at AutoForecast Solutions in Chester Springs, Pennsylvania. Detroit-based automakers want to keep cranking out their high-margin trucks, he added, and "giving up a little of the profit is the cheapest way to do it." Stores are offering discounts of up to $12,000 on the 2018 Ford F-150, which remains the best-selling vehicle in the country, recording more than 80,000 sales in May. Discounts run up to $13,000 on the 2018 Chevrolet Silverado and as high as $16,000 on the Ram 1500. Average transaction prices for full-size pick-ups range from around $42,000 to $45,000, industry analysts and automakers say. All three companies are spending furiously - GM and Fiat Chrysler to help sell off carryover 2018 trucks to prepare for redesigned 2019 models, and Ford to sustain its long-held sales crown. A supplier fire that temporarily shut down production of the F-150 last month "changed the game," said Jeff Schuster, senior vice president of forecasting at LMC Automotive in Troy, Michigan said. The supply halt nudged Ford's crosstown rivals "to ratchet up incentives on the current models to go after weakness at Ford," he said. Deals advertised on the companies' official websites range from rebates and low-interest loans to ultra-cheap lease rates, but they are not telling the whole story. Ford, for instance, advertises a $2,000 rebate and a $500 financing credit on sales of certain F-150 models. But James Collins Ford in Louisville, Kentucky, is offering discounts of up to $12,215 on the 2018 F-150 XLT SuperCrew 4x4. The price cuts are even steeper at a number of GM and Fiat Chrysler dealers. Quirk Chevrolet is selling the 2018 Silverado 1500 Double Cab at $13,000 off sticker.

New Chevy Small Block crate engine has 405 hp, endless possibilities

With decades of history, the Chevrolet Small Block V8 has definitely stood the test of time, and the company has kept finding ways to make it better. At this year's SEMA Show in November, Chevy Performance is unveiling the latest upgrade to that legacy with the new ZZ6 350-cubic-inch (5.7-liter) crate engine. Offering 405 horsepower and 405 pound-feet of torque, the mill should add a big dose of power to any project car. For the ZZ6, Chevy is working to improve the Small Block's high-rpm performance. To make that happen, the engine has Fast Burn aluminum cylinder heads and an updated valvetrain inspired by the LS family of powerplants. Large intake runners help with the airflow, and the valve springs use a tapered design that allows for less reciprocating mass. The mill also packs a forged steel crankshaft and high-silicon aluminum pistons inside of a cast iron block. Chevy is offering the engine in two versions depending on what the builder needs. The Base configuration comes with an intake, distributor, water pump, and a few other parts but lacks carburetor and accessories. Conversely, the Turn Key option has everything, including the carb, air cleaner, starter, alternator, and more. More details about their availability will be announced at SEMA. NEW ZZ6 CHEVY SMALL BLOCK ADVANCES CRATE ENGINE LEGACY Revised Fast Burn heads with LS-inspired valvetrain enhance high-rpm performance 2015-10-02 DETROIT – Developed with contemporary technologies, including a high-rpm valvetrain, Chevrolet Performance's new ZZ6 crate engine offers builders a modern twist on the classic Chevy Small Block 350. It uses updated Fast Burn cylinder heads with beehive-style valve springs inspired by the LS engine family – a feature that enhances high-rpm capability, enabling the new high-performance engine to achieve 405 horsepower and 405 lb-ft of torque. That's more power than any factory produced 350 engine ever installed in a Chevrolet production vehicle and it's one of the most powerful 350 Small Block-based crate engines in the nearly 27-year history of the "ZZ" lineup. "The new ZZ6 is the ultimate ZZ 350-based crate engine from Chevrolet Performance," said Jim Campbell, GM U.S. vice president of Performance Vehicles and Motorsports.