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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

Porsche, Jaguar continue dominance in 2015 JD Power APEAL study

The top of JD Power's 2015 APEAL Study has not changed much in the last year. Porsche remains No. 1 with Jaguar nipping at its heels, although both premium brands saw their overall score fall compared to 2014. For those that need a refresher, the APEAL Study looks at how "gratifying" a vehicle is to own and drive, rating cars and brands on a 1,000-point scale. The industry average for 2015 has increased from 794 to 798, while the total number of automakers that finished above the curve increased from 16 to 20. While Porsche and Jaguar finished at the top, their scores dropped eight and seven points, respectively, to 874 and 855. The top "non-premium" brand was Mini, which scored an impressive 825, up from 795. If the BMW-owned British marque is still a bit too premium for your tastes, last year's non-premium winner, Hyundai, did climb five points and is this year's runner up. At the opposite end of the scale, Smart sits at the very bottom of the rankings, with a score of 683 (it didn't appear on the 2014 rankings). Fiat also dropped, from fourth worst in 2014 to second worst in 2015, despite the 500 being named most appealing city car. Subaru made an impressive climb, from third worst to seventh, falling just 10 points shy of the industry average and two points south of the non-premium average. In the individual vehicle segments, eight brands earned multiple awards, with Ford, Chevrolet, and Porsche earning three apiece. Surprise segment victories included the new Ford Expedition, which beat out Chevy's popular Suburban. The Infiniti QX80 bested the likes of the Cadillac Escalade and Range Rover for best large luxury SUV, and the Dodge Challenger beat its muscle car rivals from Ford and Chevy. Most of the victories, though, were quite predictable. The Mazda6 and CX-5 took wins for the midsize sedan and compact SUV categories respectively, while the Volkswagen Golf captured the compact car win. The Ford F-150 won the large pickup category, while the Porsche Cayman was named most appealing compact premium sporty car. Check out the official release on the 2015 APEAL Study, available below, from JD Power. 2015 U.S. APEAL Study Results The latest safety-related technologies are among the drivers of customer satisfaction with new vehicles, according to the J.D. Power 2015 U.S.

Hot Wheels Camaro to make big debut at Indy

Chevrolet handed over the keys to 33 Hot Wheels Camaro Convertible Indianapolis 500 festival cars this week. Race directors get the luxury of driving the droptops around Indianapolis in an ongoing tradition with roots all the way back to the 1960s. The stunt is supposed to remind area residents that the Indy 500 is right around the corner. The cars are our first look at the special Camaro Hot Wheels Edition in convertible form, and they are slated to head to dealers after a one-time production run. The cars also represent the first time in history full-size Hot Wheels have been offered for sale by an automaker.
The cars will be available in both the previously seen coupe bodystyle and this convertible configuration, and will feature metallic blue paint and special wheels with the iconic redline accent. Buyers will be able to choose between the V6-powered 2LT trim and the V8-powered 2SS guise.
Hot Wheels says the original Custom Camaro toy was one of the original 16 1:64-scale diecasts, and it remains one of the company's most valuable collector items today.