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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 Super Cruise gets system enhancements, more compatible highways

Cadillac is updating Super Cruise to make it available to use on more highways, and it will offer better performance, too. Previously, Super Cruise worked on about 130,000 miles of highways across the continent. This update expands that to 200,000 miles. That's because GM has mapped that many more miles to be compatible with its lidar mapping system. As for the performance update, Cadillac says there will be enhancements to the driver monitoring system. That's the key feature that separates Super Cruise from all the other systems out there, making it a truly hands-free experience. It's able to quickly tell whether your eyes are on the road, and it reacts accordingly. We asked for details about the improvements, but all Cadillac would tell us is that there are "slight refinements to the driver attention system to even more accurately detect driver attention." Perhaps it's related to reports of sun-related issues plaguing the infrared monitoring camera. We can't tell you for sure. As for the extra miles, Cadillac says some added highways now include limited intersections and traffic control devices. Basically, there may be a stoplight or some cross traffic thrown into the mix now. Since GM has actually gone and mapped these areas, the car will tell you to take back control when approaching a railroad crossing, pedestrian crossing, stoplight or stop sign. Cadillac included a map (above) depicting the original and new Super Cruise compatible highways. You'll notice there are a lot more highways in the midwest and southeast, in addition to almost being able to cross the entirety of Canada now. Things are still a bit sparse in the western part of the country, but there aren't as many highways out there anyway. Owners of 2018 and 2019 Cadillac CT6s can expect to get the upgrade, but it's not as easy as you may think. Folks will have to take their CT6 in to the Cadillac dealer, where the "system enhancement" will take place. However, that enhancement doesn't include the additional miles. Cadillac says that update will be sent out over-the-air throughout the summer and fall. Updates for Super Cruise seem to be coming out with regularity. Last year Cadillac updated the system for easier activation, better lane placement (for passing large vehicles) and added gauge cluster messages for more information. We happen to love using the technology here at Autoblog, and gave it our 2019 Technology of the Year award.

Hotter Cadillac CT5-V prototype spotted with a manual transmission

Fans of the old Cadillac CTS-V (and high-performance sedans in general) may have something to be excited about. A series of interior photos leaked Tuesday reveal that prototypes of the forthcoming higher-output variant of the CT5-V Sedan have been equipped with a manual gearbox. Exclusive: Photos show the wilder Cadillac CT5-V will have a manual transmissionhttps://t.co/Ta8hZ804eg — The Drive (@thedrive) March 10, 2020 Photos obtained by our friends at The Drive show a partially camouflaged CT5-V prototype with a full interior and what appears to be a manual gear selector. While the shifter and its boot are partially obscured by a plastic covering, it's obvious that the knob is not the same one paired with Cadillac's automatic gearboxes, such as the one featured in our expertly augmented photo above.  This is not the first time the potential for a stick-shift option in the new, higher-end "V" cars has been floated. Rumors suggesting that the as-yet-unnamed higher-output CT4-V and CT5-V models might be so-equipped (at least optionally) circulated late in 2019. This, in addition to significantly higher power outputs and revised suspensions will set them apart dramatically from the base CT4-V and CT5-V, which are intended to compete with the likes of the Audi "S" line of vehicles.  CT4-V spied View 40 Photos GM has been quite cagey when it comes to details about these new models. We know they'll follow in the footsteps of previous-generation "V" cars, which were aimed squarely at Europe's powerhouse sport sedans. The hotter CT5 variant is expected to employ the automaker's 6.2-liter supercharged V8, which made 640 horsepower in the now-dead CTS-V.  We reached out to Cadillac for comment and were told by a spokesperson, "The ultra-performance variants of our Cadillac CT5-V and CT4-Vs are still under development.  We will have more details to share in the next few weeks and the CT5-V and CT4-V ultra-performance versions will debut later this year. Until then, I can only confirm that these cars will build on V-SeriesÂ’ respected legacy." Hopefully, GM won't make us wait too much longer for official details of these new high-performance models, including what we should expect in terms of powertrain availability and launch timing. Stay tuned. Related Video: