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Cadillac CT6 PHEV battery shape a big departure for GM's plug-in hybrid tech

Anyone with any familiarity with the electric powertrain details for the two General Motors plug-in hybrids will have noticed that the information we have about the newly announced Cadillac CT6 plug-in hybrid has a lot of numbers in common with the Chevy Volt and the Cadillac ELR, like the 18.4-kWh lithium-ion battery pack and an expected all-electric range of 37 miles. We also noticed that the announcement calls the plug-in CT6 hybrid an actual plug-in hybrid and not an "extended range electric vehicle (EREV)," which is what GM calls the Volt and the ELR. This, of course, means we needed to ask GM some questions. Donny Nordlicht from Cadillac communications told AutoblogGreen that while the Volt and CT6 batteries are both 18.4-kWh, the shape is completely different. In the Volt/ELR, the battery is T-shaped (see it here). The CT6 has four seats, with a tunnel running between the two in the rear, as you can see here, but the battery in the CT6 PHEV is "a cube-shaped pack, which is between rear seats and the trunk," Nordlicht said. "There is no pass through." GM has not yet released any technical schematics about this pack, but Nordlicht said that, "The CT6's advanced mixed-material platform was designed to accommodate the PHEV system by design so that it minimally intrudes on the cabin space." It also means that the CT6 can be ordered as an optional PHEV, while the Volt and ELR were purpose-built plug-ins. GM is also distinguishing between the EREV and PHEV powertrains in its vehicles from this point forward. "We are not discarding the EREV language," Nordlicht said. "The CT6 utilizes a two-motor system mated to a 2.0T 4-cylinder engine, which is an all-new system to Cadillac." We assume that the PHEV packs will use li-ion cells from LG Chem, just like the EREVs do, but Nordlicht did not answer our question on that point. As for other details about the CT6 PHEV – like production, full dimension, and pricing – we will just have to wait until closer to when the vehicle launches for those. Related Video:

How GM's grueling 24-hour test gets the kinks out of its performance cars

One of the biggest challenges automakers face when designing a high-performance car is making sure that it is both fast and reliable. For General Motors, any car that might be taken to the track by its owner - like the Corvette, Camaro Z/28 (shown above) and the Cadillac CTS-V, for example - undergoes a rigorous and strenuous 24-hour test by engineers at the Milford Proving Grounds, as pointed out by Car and Driver.
We've posted on this topic in the past - on a video showing the Camaro ZL1 being brutalized, for instance - but this article gives a more in-depth look at what actually happens behind the scenes... including what that poor ZL1 went through. Though the test isn't for 24 hours straight, the cars are pushed as hard as possible by some of GM's best drivers with only the brakes and tires replaced frequently.
We don't want to ruin the fun for you, but it is an interesting article that tells just some of what GM does to develop its sports cars. Check out the full article over at Car and Driver for the rest of the story.

Cadillac gives ATS, CTS new V6 for 2016

Replacing the existing 3.6-liter V6 in the Cadillac ATS and CTS is... another 3.6-liter V6. But this one promises higher output, while consuming less fuel, and making less noise. Like the V8s in the CTS-V and Escalade, it's got cylinder-deactivation technology to cut it down to a four-pot under lighter loads, as well as automatic stop/start, and comes mated to an eight-speed automatic transmission. The new engine produces 335 horsepower and 284 pound-feet of torque. That's a modest improvement over the 321 hp and 275 lb-ft mustered by the unit it replaces. But it also delivers an approximate improvement of nine percent in fuel economy and eight percent in carbon emissions. That's what we'd call a win-win, even if it's a modest one. Of course, those ATS or CTS buyers attracted to higher efficiency will still likely go for the 2.5-liter inline-four or the 2.0-liter turbo four. And those more inclined towards performance will be tempted by the 3.6-liter twin-turbo V6 in the ATS-V or CTS Vsport – or the 6.2-liter supercharged V8 in the CTS-V, for that matter. But those customers looking for the best of both worlds will surely be pleased by the improvements the new atmospheric V6 and 8-speed gearbox bring to the table. Related Video: New Technologies Boost Efficiency for 2016 CYLINDER DEACTIVATION AND START/STOP SYSTEMS BEGIN PRODUCTION ON ATS AND CTS PRODUCT LINES 2015-10-09 Renowned for luxury and design, Cadillac has recently added dynamic driving performance to its list of attributes. Now as 2016 model year production begins, Cadillac adds new fuel-saving technologies. Active Fuel Management and Automatic Stop/Start technologies, and widespread use of a new 8-speed transmission, are combining to raise fuel economy ratings and reduce emissions in Cadillac's portfolio. Cadillac's all-new six cylinder engine contains Active Fuel Management, or cylinder deactivation, technology enabling it to seamlessly switch from six-cylinder to four-cylinder operation under certain light-load conditions, while maintaining excellent performance. The new 3.6-liter engine is part of the 2016 ATS and CTS product lines. Additionally, the Cadillac Escalade luxury SUV's V8 will shift to four-cylinder operation in many daily driving conditions, as will Cadillac's all-new high performance CTS-V sedan.