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GM opens official investigation into C8 Corvette transmission leaks

In March 2020, a month after Chevrolet began customer deliveries of the 2020 C8 Corvette, a GM dealer technician created a Reddit thread about a leaking gearbox in a Corvette with 32 miles. That car hadn't even been sold yet. Since then, as a search of "C8 Corvette transmission leak" shows, it's been tales of woe for some owners. Something in the Tremec TR-9080 transaxle in the back of the mid-engined Corvette doesn't work as it should, the fault able to cause codes that the transmission needs service, or that the driver needs to shift to park. In some cases, the battery would die because of follow-on issues after the initial transmission code, that code preventing the car from powering down. As Autoevolution reports, GM filed paperwork with the National Highway Traffic Safety Administration in August to look into what's going on. Between forum threads and GM's investigation document, there are several issues mentioned. The most common appears to be the dual-clutch transmission leaking fluid due to gasket failures like the one suffered by one owner at 858 miles, and another for an owner currently enduring a second leaking transmission. The Midengined Corvette Forum reported that Chevy engineers redesigned the TR-9080 pan, fitting Corvettes with the new unit at some point in the 2021 model year. The original pan was stamped steel unit affixed to the engine with two studs and 13 bolts, plus "reinforcement plates." The updated pan is said to be a cast aluminum unit affixed with two studs and 17 bolts, omits the reinforcement plates, and gets a new machined new groove around its edge to seat the gasket seal. The GM paperwork now at the NHTSA mentions a P1789 code, and says one reason for it could be "debris on the park position sensor magnet causing an incorrect position reading to the TCM." This might be caused by another issue mentioned in forums, which is clogged transmission filters. GM gives instructions for returning transmission filters to the company, and a poster on one forum said the Corvette tech at the dealer where he bought his Corvette told him the automaker "requires every used transmission filter to be returned to GM."  Whatever's going on, the problems haven't stopped, and they go beyond the P1789 code. Over the weekend, a 2022 Corvette owner posted on Corvette Forums that he got a check engine light on his car after just 850 miles.

GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

Old Car or New Car? 1993 Chevy Camaro vs 2015 Honda CR-Z

My daily life revolves around used cars. As a former fast-talking auto auctioneer, it was once my job to inspect, appraise, and liquidate thousands of cars throughout the United States. Since I put down my microphone and became a full-time car dealer, I have gone from auctioning off 150 vehicles an hour – yes, we really do talk that fast – to buying 150 vehicles every two to three months. I see and bid on everything from $300 Volkswagens that belch more black smoke than a diesel truck rolling coal, to $30,000 DeLoreans that hopefully can go at least 88 miles per hour. The auctions never run out of weirdness when it comes to cars because they sell over 10 million every single year. So with that big number in mind, let me tell you about these two cars that have about as much in common as Mel Gibson and Mel Brooks.Option A: 1993 Chevrolet Camaro Indy 500 Pace Car Edition View 24 Photos This 1993 Chevrolet Camaro Indy Pace Car has all of 4,187 miles on it. Neither of those numbers are a misprint and yes, those are multi-colored stripes on the hood. Every week, I find at least two or three museum pieces that have been stored in the private garage of an auto collector. As you can tell, there are some very broad strokes to the definition and tastes of a collector. It could be a guy who has an extreme case of what I call "Automotive Compulsive Disorder" who chucks 20 or 30 old cars into a field and lets the weather and elements have at them. I once knew a guy, a car dealer at that, who "stored" seven 1990s Oldsmobile Cutlass Supreme convertibles in the Georgia sun, and within two years those cars turned into complete junk. The fact that he stored them in an open field he didn't actually own and near a public road didn't help either. A few of the local meth heads and kleptocrats decided to strip-mine his collection, from the radiators to the tops themselves. He had a brief time in prison in between the before and the surprise after and trust me, he looked like he had soiled his britches when he saw what happened to his personally prized Cutlasses. Then you have whoever owned this Camaro. Is it a one-of-a-kind? Nope. Just 1 of 125, and an insignificant number at that (#87). But let's open the door to this Camaro and see what we find. Oof! I don't remember this multi-colored silly string design as a '90s must-have. Wasn't this popular back in the 1980s?