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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

Lutz dishes dirt on GM in latest Autoline Detroit

Bob Lutz sits down for Autoline Detroit - Click above to watch video after the jump
Autoline Detroit recently played host to Bob Lutz, and, as is always the case, the former General Motors vice chairman dished out some great commentary. Lutz was promoting his new book Car Guys vs. Bean Counters: The Battle for the Soul of American Business, and talk quickly turned to his role as it related to product development and high-level decision making at GM. While on the topic of brand management, Lutz revealed a few rather interesting tidbits about his former employer:
All Chevrolet vehicles were required to have five-spoke aluminum wheels and a chrome band up front, as part of the Bowtie brand's overall image.

Cadillac Super Cruise priced from $2,500 on the 2021 Escalade

Super Cruise will find its next home in the 2021 Cadillac Escalade. The brand had rolled out Super Cruise three years ago on the CT6 as a $5,000 option for the top two trims, then switched up pricing for 2020 when MSRP increases on the top two trims made the more full-featured Super Cruise standard. Cadillac Society reports that the brand will make the hands-free driving technology an option on all but the base 2021 Escalade. On the Premium Luxury and Sport, the feature will cost $2,500, but requires the $3,650 Driver Assist and Technology Package that bundles adaptive cruise control, air ride adaptive suspension, automatic seat belt tightening and soft-close/cinching doors, enhanced automatic emergency braking and reverse automatic braking, and illuminated front sill plates. This brings the total to $6,150 for the middle two trims. The top Premium Luxury Platinum and Sport Platinum trims include the Driver Assist Package, making Super Cruise a no-fuss $2,500 option. The pricing is the same on the standard model and long-wheelbase ESV trims. Earlier this year, Cadillac announced the improvements its made to the SAE Level 2 autonomous driving system, prime among them being the automatic lane change feature. After the driver flicks the turn stalk to indicate the desired lane, the system will automatically locate an opening in traffic where it can safely change lanes. Numerous small improvements will make life easier for drivers, too, like 70,000 more miles of compatible highways, easier Super Cruise engagement, finer steering and speed control, smoother turns, better control through highway interchanges, and much richer map information. After the Escalade, the CT4 and CT5 sedans, and the XT6 are in line to receive Super Cruise blessings. A couple of years ago there were rumors that the XT4 and XT5 would get Super Cruise, but that's likely a ways off, if it happens. Related Video: