A 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
ACR what it is, there are other new pieces of hardware included in the car’s $122,490 MSRP. Larger carbon-ceramic brakes that measure 15.4 inches (1.4 inches larger than before) with six-piston calipers in front necessitated bigger, 19-inch front wheels (one inch larger than standard). The rear wheels hide 14.2-inch carbon-ceramic rotors with four-piston calipers.
the braking power, the ACR wears new tires developed specifically for this application. Development on the rubber started two years ago, which is when Dodge approached Kumho; the result is the Ecsta V720. A near slick, the Kumhos have a few superficial grooves molded into them to make them nominally street-legal. The rear tires remain sized 355/30R-19, but while the front tires are the same 295 width as on other Vipers, they have a section height of 25 against the regular car’s 30s.
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.
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.
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