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MotorWeek Retro Review revisits 1984 Corvette

MotorWeek's Retro Reviews are always a great glimpse into the cars of yesteryear. However, the newly uploaded look back at the 1984 Chevrolet Corvette is an absolute treasure trove for any auto history buff. This is a full episode of the show from the '80s, and it's dedicated to all of the details about the newest 'Vette to hit the market at the time. Beyond just the usual drive and an in-depth walk around, one of the major highlights here is a brief look at some on the concepts that eventually resulted in the fourth-generation Corvette of 1984. The C4's shape harkens back to sketches from 1978, and there even shots of early clay models that led the way for the design. MotorWeek also takes a tour through the Bowling Green, KY, factory for a detailed inspection of the entire production process. John Davis repeatedly calls the Corvette "the plastic fantastic" during the episode, and he can't find too much negative to say about being behind the wheel of the then-new coupe. See how it stands up to your own memories in the clip above.

Cadillac could base its entry-level sedan on the Chevy Cruze [UPDATE]

UPDATE: Cadillac spokesperson Donny Nordlicht tells Autoblog , "The post speculating on a future Cadillac model derived from the Chevrolet Cruze is completely false." Premium automakers Mercedes-Benz and Audi have seen plenty of success with new small front-drive-based sedans. The CLA-Class had its best January ever this year, while Audi moved more of its new A3 in 2015 than its predecessor sold in 2005 through 2010 combined. The fact that Cadillac wants a piece of that pie is no surprise, then. There's a new rumor that GM's luxury brand could launch its own compact – possibly called CT2 – to battle the Germans. Cadillac, a brand that's pushed hard to rebuild its rear-drive reputation, could develop a new entry-level model based on the front-wheel-drive 2016 Chevrolet Cruze's D2XX platform. Go ahead and make your Cimarron jokes. Sources are telling GM Inside News that a Cadillac built on the Delta platform would ditch the Cruze's turbocharged 1.4-liter four-cylinder for a 1.5-liter turbo in base models. General Motors' well received 2.0-liter turbo four would serve in higher-end models. According to GMIN, the Delta-based Cadillac would likely command a $6,000 to $9,000 premium over the Cruze, so figure $23,000 to $26,000 on the low end to $30,000 to $33,000 for something at the top of the range. As much as we dislike the kind of badge engineering that brought us the Cavalier-based Cadillac Cimarron in the '80s, the company has done an admirable job of distinguishing vehicles on shared platforms lately. A Delta-platform Cadillac would at least have a good basis – the new Cruze is surprisingly comfy. That said, we question GM's rationale if this rumor is indeed true. Put simply, Cadillac needs another sedan like I need another student loan payment. The company has four sedans, three of which overlap two segments, and none of which are selling very well. That's not because they're bad, but because customers want crossovers, of which Caddy has but one – the new XT5. Spending the time and money to add a fifth sedan to the mix when the company desperately needs to flesh out its CUV range would be a tremendous mistake. As much as we hate to say it, if Cadillac really wants to add a small, entry-level car to its range, it'd better be a crossover. Related Video:

'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).