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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 considering ultra-luxe, $100k+ Escalade

The Cadillac Escalade has pushed incrementally up-market over the years. From its humble Chevy/GMC truck underpinnings, the latest Escalade starts at $72,970 and tops out at $96,940. But according to the latest reports, Cadillac is weighing an even more upscale version. Though the exact nature of the upgrades that would push the Escalade further up-market remain unknown – and perhaps undecided at this point – the impetus for such a move is crystal clear. European luxury SUVs keep getting more and more expensive, both from established players and new challengers. Bentley just launched the Bentayga, and other luxury marques like Rolls-Royce, Aston Martin, Jaguar, Maserati, and Lamborghini are all getting into the game. All the while manufacturers like Land Rover and Mercedes-Benz keep rolling out ever more expensive offerings, like the Range Rover Autobiography and anticipating forthcoming Maybach sport-ute. To challenge those European imports with their astronomic price tags, Cadillac could go with an even higher trim level than its existing Platinum spec – or it could go with a more powerful, performance-oriented Escalade V or Vsport. Getting that big a vehicle to hustle would require a lot of power, but then General Motors has never been one to shy away from slotting a bigger engine into its vehicles. One thing's for certain though, and that's that Cadillac isn't quite done with pushing the Escalade higher up the market.

Cadillac CTS-V gets Stealth Blue and Silver Frost limited edition models

A little more than a year and a half ago, former weekend editor Alex Nunez and I were talking about how sweet it would be for Cadillac to offer a CTS-V in the Corvette's Supersonic Blue paint, and as if General Motors eavesdropped on our conversation, this showed up. And while the Stealth Blue car you see here isn't an exact duplicate of the hot-looking sedan GM showed off in prototype form, it's really close. And really sweet.
New for 2013, the Cadillac CTS range gets two new colorful editions, starting with the Stealth Blue package available on the CTS-V (in sedan, coupe and wagon bodystyles) as well as the naturally aspirated CTS coupe. In addition to the unique paint, blacked-out grille and dark satin wheels, Stealth Blue cars can also be done up with an optional Twilight Blue leather interior. (And you thought blue-on-blue color schemes died in the '90s.)
Cadillac is also offering a new Silver Frost package, but it's a bit more exclusive. Only 100 examples will be built, all in CTS-V Coupe form. The Silver Frost paint is a low-gloss matte finish, in that while it technically has a clearcoat covering, it's reduced in a way that the surface still appears flatter than standard paint. Even so, Cadillac states that the car should be hand-washed only.