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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.

Hennessy wastes no time in supercharging the 2015 Cadillac Escalade

The ink is still drying on the all-new 2015 Cadillac Escalade sales brochures, but that hasn't stopped Texas-based Hennessey Performance (HPE) from leaping out of the gate with its own high-performance variant. In stock form, the big fourth-generation Cadillac flagship arrives with a new small block naturally aspirated 6.2-liter Ecotec3 V8 delivering 420 horsepower and 460 pound-feet of torque. Fresh out of the showroom, the 5,900-pound SUV will sprint to 60 mph in 5.9 seconds.
While that is plenty fast for some owners, others don't want to be shamed by a 550 horsepower Mercedes-Benz GL63 AMG or a 510 horsepower Land Rover Range Rover Sport - both will leave the stock Escalade at a stoplight.
The team at HPE has come to the rescue with its HPE550 supercharger upgrade, which includes a belt-driven supercharger, air-to-water intercooler, recalibrated engine management software and a three-year/36,000 mile powertrain warranty. With 6 psi of boost, the direct-injected 6.2-liter is tuned to deliver an impressive 557 horsepower and 542 pound-feet of torque - gains of 32 percent and 18 percent, respectively, over stock. Although HPE isn't releasing performance figures as of yet, our math says that should be enough power to put the two Europeans in the Cadillac's rearview mirror. The company also offers a set of 20-inch lightweight H10 forged monoblock wheels, to further improve performance.

2015 Cadillac Escalade on sale in April priced at $71,695*

With the fourth-generation Cadillac Escalade set to go on sale in April, Cadillac has released the pricing data for its fullsize luxury SUV. While there's no retail configurator yet, the data posted on AOL Autos - and confirmed by Cadillac - shows that the 2015 Escalade will have a starting price of $71,695 (*not including $995 for destination).
This new starting price is about $8,000 more than the outgoing model, but Cadillac is quick to point out that the latest 'Slade is packed with more standard equipment in the new base Standard trim that actually puts it more on par with the midlevel Premium trim on the 2014 model (currently priced at $73,245). These new standard features include Magnetic Ride Control, LED headlights and taillights and 20-inch wheels.
Stepping up to the 2015 Escalade Luxury, the price increases to $75,695 and includes added equipment like 22-inch wheels, head-up display, power fold-and-tumble second-row seats and safety systems such as forward collision warning and lane departure warning. The top-rung 2015 Escalade Premium will start at $80,195 adding features such as a rear-seat entertainment system, illuminated exterior door handles and the Driver Assist Package consisting of front and rear automatic braking and adaptive cruise control.