The 2016 Dodge Viper ACR is the fastest Viper around a racetrack—at least that’s what Dodge claims—but a 177-mph top speed makes it the slowest Viper. With the exception of a finned differential for cooling, the ACR’s drivetrain is identical to that found in the rest of the Viper lineup. That means an 8.4-liter V-10 that throbs out 645 horsepower and 600 lb-ft of torque and looks to be about the size of a steamer trunk. What makes the Viper ACR faster around a racetrack is also what reduces its straight-line speed—downforce.
Mopar looks to have a big-power Challenger drag special for SEMA, Another possibility is a new Challenger Drag Pak. The last one was offered for 2015 and had the option of a supercharged 5.8-liter V-8, and the one before it, offered for 2011, came with a Dodge Viper. – News from www.motorauthority.com –
Downforce uses air for the very noble purpose of pushing a car down into the earth. The harder the air pushes the car into the tarmac, the faster the car can corner. But downforce also creates aerodynamic drag, which slows down a car at the top end. Imagine an upside-down set of airplane wings strapped to the roof of a Viper and you have a decent idea of how it works.
By default, a huge adjustable wing is bolted to the Viper ACR’s trunklid, a massive front splitter gives the car an underbite, the front bumper is flanked by a dive-plane moustache, fender vents perched above the front tires reduce lift, and a rear diffuser cuts the air like a mandolin slicer. Opt for the ACR Extreme package, however, and the wing, splitter, and diffuser all grow, making them even more effective and pushing the ACR harder into the asphalt—to the tune of 2000 pounds of downforce at its 177-mph top speed. The penalty comes in terms of the stated drag coefficient, which is 0.54 for the ACR Extreme versus 0.37 for the regular Viper SRT and 0.43 for the Viper TA.
We drove the Viper ACR Extreme at Virginia International Raceway a month after conducting the ninth iteration of our Lightning Lap test on the same premises, the results of which will be published in the coming weeks. We didn’t get to time our laps or record any telemetry, but we’re confident that the ACR is several seconds quicker around the 4.1-mile-long course than the Viper TA we tested for Lightning Lap at VIR last year, a car that ran a 2:49.9. Complete review on www.caranddriver.com, by Manufacturer
This review is about viper acr.