It’s not enough for a high-performance car to be fast – it must also be reliable. The required period of reliability varies. In the case of a Top Fuel dragster, four seconds of full-throttle motoring between engine rebuilds is just fine. For a road-going car, such as either of the upcoming Cadillac Blackwing supe sedans, customers expect more.
“We have to accumulate a total of 24 hours of hot lapping,” Mirza Grebovic, Cadillac Blackwing chief engineer, explained to GM Authority executive editor, Alex Luft, in a recent interview.
“A lot of time it’s on the Milford East course, but sometimes it’s on a track outside our providing grounds, such as VIR [Virginia International Raceway], Gratton, Road Atlanta, Willow Springs, or Spring Mountain. The track often depends on the weather.”
Grebovic’s choice of words should be noted here. Accumulating 24 hours of hot lapping is not the same as hot lapping for 24 hours, since the total elapsed time can be considerably longer. However, during the test period, the team is “not allowed to change anything on the car but wear items per schedule. If anything breaks, or if anything happens to the car during testing, we discuss the issue, and we handle it from there.” And, presumably, set the clock back to zero.
“Luckily with our experience from the last-gen cars, we didn’t have those issues,” Grebovic added, referring to the Cadillac ATS-V and third-gen Cadillac CTS-V. “On the CT4-V Blackwing, for example, we finished testing in about a week and a half.”
The Cadillac CT5-V Blackwing will be the most powerful car that GM’s luxury division has ever put into production. Its supercharged 6.2L V8 LT4 gasoline engine produces 668 horsepower and 659 pound-feet of torque, giving the vehicle a top speed of 200 mph and a 0-60 mph time of 3.7 seconds. The twin-turbocharged 3.6L V6 LF4 engine in the CT4-V Blackwing is rated at 472 horsepower and 445 pound-feet of torque, enabling a top speed of 189 mph and a 0-60 mph time of 3.8 seconds.
Production of both models has been scheduled to start on July 5th at the GM Lansing Grand River plant in Michigan. However, the likelihood of meeting this target depends on the global shortage of semiconductors, which caused the plant to shut down on March 15th. However, production at the facility is set to resume during the first week of May.