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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 dealers get $5,000 incentive for ELR test drives

The 530 Cadillac dealers - out of 940 total dealers - that signed on to sell the brand's ELR for $75,000 or lease it for $699 per month have managed to move 247 of them in the last five months. That's a little less than two cars for each dealer more than two dealers for each car if you need help with the math. With inventories of the luxury plug-in hybrid building up - Automotive News reports a 725-day supply - General Motors has created the Demonstrator Allowance Program to billow the sails on that slow moving ship, giving dealers $5,000 to promote ELR test drives.
A dealer with one ELR in its test fleet that racks up 750 test driven miles between May 1 and June 2 earns the fifty Benjamins, a dealer with two ELRs in the test fleet will get one hundred Benjamins. That will be added to summer incentives for dealers that pay $2,000 for units sold in July and $1,000 for units sold in August, while on the customer side, Cadillac has put "customer discount certificates" worth $3,000 on the hood for buyers and lessees.
Cadillac suggests this is about raising awareness of the ELR, but the question is how much dealers will be able to do for a car that observers - and buyers, apparently - still consider highly overpriced.

2015 Cadillac ATS-V gunning for the BMW M3

Spy photographers have spotted something interesting. Cadillac engineers have taken to public streets with the upcoming ATS-V and a playmate: the current BMW M3 Sedan. The prototype seen here wears a more aggressive front fascia, flared fenders and beefy brakes. Quad exhaust tips and what looks to be a small lip spoiler on the trunk deck sum up the most obvious visual changes over the standard ATS outside. Word has it the ATS-V will bow with the same twin-turbo 3.6-liter V6 available in the nose of the XTS. In that application, the engine is good for a stout 410 horsepower, which should be more than enough to hustle the sedan around a track.
Other details are still murky, however. First and foremost: will GM offer the ATS-V with an honest manual transmission, like it does with its big brother, the CTS-V? Something tells us we won't have long to wait to find out - the machine will likely bow next year as a 2015 model. Until then, dig in on our newest bevy of spy photos.