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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

Cadillac CT5 Luggage Test | How big is the trunk?

The Cadillac CT5 is a midsize luxury sedan. At least by today's standards. By the standards of Cadillac's past, it's practically a compact. At 193.8 inches long, the CT5 is 3 inches shorter than its STS predecessor of 15 years ago and 11 inches shorter than the Seville of 25 years ago. This is significant since virtually every other car brand's offerings have grown from generation-to-generation. See the BMW 5 Series as just one example. You'd have to go back to the 1980s to find a CT5 ancestor that's smaller, though that stubby thing was an aberration.   Honestly, I'm just sharing that because I think it's interesting. This post is about trunk space, and exterior size doesn't necessarily equate to how much junk you can fit in the trunk. In fact, the CT5 is pretty good example of that. Although smaller than its predecessors, the CT5 is still an awfully big car that's comparable to other midsize luxury sedans, including the 5 Series, Audi A6 and Mercedes-Benz E-Class. The trunk, however, is notably smaller than what you'd get in those with a rather rinky-dink 11.9 cubic feet. That's coupe territory and less than what you'd get in some subcompact sedans. The A6 and E-Class are in the 13-cube range, while the 5 Series apparently has 14.5 cubic feet.  So, how small is 11.9 cubic feet? Although plenty wide at the rear, which should be handy for golf clubs, the CT5's trunk isn't very long compared to all those competitors. The A6's is narrower but also practically a tunnel by comparison. Also, note the ramp-like structures along the outer edges. Besides making loading a hassle, they effectively make the trunk even smaller than the 11.4 cubic-feet that's technically there since it's so difficult to load items right up to the wheel wells. You can see a closer look at those "ramps" above left along with the smallish pass through that oddly looks like a previous-generation Hyundai Sonata's grille.  Above right you can see the underfloor storage. There is no spare tire.  Besides those "ramps" impeding luggage loading from below, these giant speakers hanging down from the parcel shelf sure don't help, either. Watch your hands while loading, as well as anything that might be easily scratched (or that might damage the speakers) OK, let's get to the bags.

Cadillac is doing a 'second installment' of the CT6-V for $92,790

After being all but certain the Cadillac CT6 would begin pushing American daisies June 1, the brand said "the CT6 was never meant to be fully on the chopping block." The same day we got that news, Cadillac began taking pre-orders for the CT6-V. Limited to 275 units and costing $88,790 after destination, orders came in so quickly that order books closed only hours later. Turns out the phrase "275 pre-order slots" was another slight miscommunication. Cadillac has announced continued production of the CT6-V, this time costing $92,790. In February, Cadillac Society confirmed with the automaker that the 275 figure only applied to pre-orders. It isn't clear how many CT6-Vs will be built in what the brand calls the "second installment," but it is clear that buyers who didn't get in early will pay more. Cars Direct was privy to a letter sent to dealers that said pre-order buyers "were rewarded with a special introductory offer by quickly raising their hand." Those slow on the draw have hopefully used the extra time to fish another $4,000 from their pockets. The elevated price buys the same car that was $88,790 two months ago - nothing has changed but the bottom line. The new MSRP puts more distance between the hot CT6-V and the $89,290 CTS-V. Conversely, the CT6-V with a Blackwing V8 beating 550 horsepower and 627 pound-feet of torque is now just $4,000 less than the coming Platinum V8 trim, which costs $96,790. That Platinum version gets a detuned Blacking putting out 500 hp and 553 lb-ft. The vague phrase "second installment" phrase makes us think Cadillac's not committing to a number so it can cap production at will depending on how this more expensive go-round fares. Still, it's good news for anyone who wanted the sedan new and didn't hit the buzzer quickly enough in January. As if all that weren't surprising enough, GM Authority reported that there's a second-gen CT6 in development. The outlet's sources say the new sedan will move to GM's VSS-R platform, the modular architecture that will replace both the Alpha and Omega platforms. The platform initialism stands for Vehicle Set Strategy - Rear-wheel drive. The car even has a codename: 7ESL, where 7 represents the architecture, E the segment, S the sedan body style, and L the Cadillac brand. Looks like the CT6 will be nothing but surprises this year.