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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

Hottest Cadillac CT4-V and CT5-V rumored to offer manual transmissions

We recently received one large detail to fill in the picture of the hottest versions of the Cadillac CT4-V and CT5-V, the sedans maybe or maybe not called Blackwing. As you know, due to a platform switch caused by cost cutting at parent GM, the 4.2-liter twin-turbo Blackwing V8 won't figure in the equation because it won't fit in the engine bay of either sedan. The new, gone-too-soon engine is too wide and too tall. The hottest V models will turn to stalwarts in the range, the CT4-V appearing to get the 3.6-liter twin-turbo V6 used in the departed ATS-V, the CT5-V working with the 6.2-liter supercharged V8 also put to use in the Chevrolet Camaro ZL1 and C7 Corvette Z06. But all of this could mean good news for three-pedal enthusiasts; both engines have been paired with manual transmissions previously, and Muscle Cars & Trucks says both of the coming flagship V models will get manual transmissions. We've expected a manual in the CT4-V. Not only did GM President Mark Reuss say, "Cadillac will make manuals in V-Series" during the launch of the milder V variants, but spy video of the CT4-V from last summer captured a camouflaged CT4-V looking and acting like a car with a manual gearbox. However, no one surmised that the CT5-V would get a manual, too. None of the bigger sedan's competition is sold with a stick shift, and the retired CTS-V with the same 6.2-liter supercharged V8 was only sold with an eight-speed automatic, while just one aisle over the Camaro ZL1 offered a six-speed manual and the Corvette Z06 a seven-speed manual. The last time Cadillac put a row-your-own in the midsize luxury scorcher was the second-gen CTS-V — the one that came in a wagon bodystyle, too — which paired a supercharged LS9 V8 derived from the C6 Corvette ZR1 and a six-speed Tremec manual. MCT doesn't cite any sources, so take this as rumor for now. It's possible to read Reuss' statement in line with this rumor, though. The assumption has been that the plural "manuals" referred to multiple stick shifts going into multiple CT4-V sedans, whereas he could have meant there will be two manual-equipped sedans in the V-Series range. We'll hope for the best and see what pops out of the transmission tunnels on both sedans when they debut later this year. Related Video:

President Trump might get to start his administration in a new Cadillac limo [UPDATE]

(UPDATE: Jalopnik is reporting an unidentified source claimed the new limo would not be featured in today's inauguration ceremony. The source did say however that the limo would join the presidential fleet later this year.) A rumor is going around that President-Elect Donald Trump will have a brand new set of wheels the day he takes office. The Cadillac Presidential Limousine, nicknamed "The Beast," was last refreshed in 2009 and led President Barack Obama's second inauguration-day parade. Cadillac could not confirm any timeline for the new presidential limo, nor could it confirm any specifics about the car nicknamed Beast 2.0. That's as expected, because details on the presidential limo are closely guarded and considered matters of national security. The outgoing original "Beast" limo marked a switch to a custom-built vehicle based on a General Motors truck frame. Previous limos were based on the actual cars they looked like. As we've seen in spy shots, The Beast 2.0 limo looks more like an Escalade SUV or CT6 sedan but is reported to be roughly the same size and shape as the old Beast, which is built on a Chevrolet Kodiak/GMC TopKick medium-duty truck chassis. AutoWeek is reporting that the new limo is set to debut for Trump's inauguration, however those reports could not be confirmed for the reasons mentioned above. The new Presidential car is expected to accommodate seven passengers in conference-style seating in the back like the current version. The Beast isn't meant for road trips, as it is mostly used to ferry the President to and from Air Force One when traveling, or on short trips around Washington D.C. That's good, considering the current limo only gets 3.7 miles per gallon. Along with multiple screens for video conferencing, The next Beast will also definitely include advanced armoring and weaponry. For security reasons, it's impossible to know the extent of those systems, but any vehicle transporting the most powerful man in the world around has to be tough. The entire process of designing and building the Presidential limo is top secret, as the Secret Service figures the less everyone knows about the Presidential Limo, the better. The new Beast, we can safely assume, is likely the safest vehicle in the world. The Secret Service began taking bids on building a replacement in 2014 because integrating all of the required armor is technically challenging.