1977 Chevrolet Blazer K5 4x4 Cheyenne on 2040-cars

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'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).

U.S. new-vehicle sales in 2018 rise slightly to 17.27 million [UPDATE]

DETROIT — Sales of new vehicles in the U.S. rose slightly in 2018, defying predictions and highlighting a strong economy. Automakers reported an increase of 0.3 percent over a year ago to 17.27 million vehicles. The increase came despite rising interest rates, a volatile stock market, and rising car and truck prices that pushed some buyers out of the new-vehicle market. Industry analysts and automakers said strong economic fundamentals pushed up sales and should keep them near historic highs in 2019. "Economic conditions in the U.S. are favorable and should continue to be supportive of vehicle sales at or around their current run rate," Ford Chief Economist Emily Kolinski Morris said after the company and other automakers announced their sales numbers Thursday. That auto sales remain near the 2016 record of 17.55 million is a testimonial to the strength of the economy, said Mark Zandi, chief economist at Moody's Analytics. The job market, he said, has created new employment, and wage growth has accelerated. "That's fundamental to selling anything," he said. "If there are lots of jobs and people are getting bigger paychecks, they will buy more." The unemployment rate is 3.7 percent, a 49-year low. The economy is thought to have grown close to 3 percent last year, its best performance in more than a decade. Consumers, the main driver of the economy, are spending freely. The Federal Reserve raised its key interest rate four times in 2018 but is only expected to raise it twice this year. Auto sales also were helped by low gasoline prices and rising home values, Zandi said. It all means that people are likely to keep buying new vehicles this year even as they grow more expensive. The Edmunds.com auto-pricing site estimates that the average new vehicle price hit a record $35,957 in December, about 2 percent higher than the previous year. It will be harder for automakers to keep the sales pace above 17 million because they have been enticing buyers for several years now with low-interest financing and other incentives, Zandi said. He predicts more deals in the coming year as job growth slows and credit tightens for higher-risk buyers. Edmunds, which provides content, including automotive tips and reviews, for distribution by The Associated Press, predicts that sales will drop this year to 16.9 million.

Junkyard Gem: 1988 Chevrolet Spectrum Sport Coupe

Before General Motors created the Geo brand for cars built or designed by its overseas partners, the Chevrolet Division put its badges on U.S.-market versions of the Toyota Corolla Sprinter, the Suzuki Cultus and the Isuzu Gemini. Those cars were known as the Nova, the Sprint and the Spectrum, and all became Geos starting with the 1989 model year. Today's Junkyard Gem is one of the last Chevy Spectrums ever sold, found in a Denver self-service yard a few months ago. Midway through 1988, the Chevrolet Spectrum abruptly became the Geo Spectrum and was assigned to the 1989 model year. This car was built in May 1988, making it one of the very last of the pre-Geo Spectrums. The Chevrolet/Geo Spectrum was available as a four-door sedan and as a three-door hatchback, from the 1985 through 1989 model years. For 1988 only, a Spectrum Sport Coupe package, featuring some trim upgrades and these rad decals, could be had on the hatchback. This car was essentially identical to its Isuzu-badged counterpart, the I-Mark. In 1988, the MSRP for the cheapest possible Chevy Spectrum hatchback (the stripped-down Spectrum Express) was $6,495, while its somewhat better-equipped I-Mark twin started at $7,439 (that's $17,128 and $19,617 in 2023 dollars). Meanwhile, the base Hyundai Excel hatchback listed at $5,295 and the Yugo GV cost a hilarious $4,199 ($13,963 and $10,941 in today's money). Power came from this 1.5-liter SOHC four-cylinder, rated at 70 horsepower. A turbocharged version with 110 horsepower was available as well. You could get an automatic transmission in the Spectrum, but this car has the base five-speed manual. This car didn't get the optional air conditioning, but at least it has the traditional Isuzu HVAC control icons featuring blow-dried hair and high-heeled dominatrix boots. Just over 170,000 miles on the odometer. Someone installed a pretty good (for the 1980s) Blaupunkt Charlotte CR148 cassette deck in the dash. This was a necessity if you wanted to enjoy full appreciation of the music of the era. The Spectrum is special! It's as slick as city rain. "I didn't spend a lot of money but with my Spectrum it looks like I did." Joe Isuzu mocked Toyota salesmen when pitching the I-Mark. As was nearly always the case during the 1980s, the JDM ads for the same car were much more fun. They should have recreated this commercial with Spectrums.