dodge-viper-acr

The American Club Racing (ACR) variant was initially introduced as a package on the 1999 Viper GTS (Phase SR II). For the 1999 model year, Koni adjustable shocks were installed and later changed to Dynamics in the 2000 model year. The spring rates were also increased. The ACR was available in solid color or with stripes, with color choices changing yearly, along with ACR badging. Air conditioning and radio were deleted as standard, but could be added back as a $10,000 option. The ACR used the same K&N air filter and smooth tubes from the GT2 for power gains, along with BBS rims. A new 5-point harness with the ACR logo was installed for both the driver and passenger.

The ACR made a comeback to the Viper line-up after the 2008 model year. Its upgrades were more drastic than the original, including street-legal racing tires, two-piece brake rotors, adjustable suspension, and significant aerodynamic enhancements. These enhancements included a front splitter, canards, and a carbon fiber adjustable rear wing. The engine received no modifications, so power and torque remained at 600 hp (447 kW) and 560 lb⋅ft (759 N⋅m), as in the standard SRT-10. The ACR is street-legal and is similar to the MOPAR Viper that Dodge displayed at various auto shows. Weight was also decreased by 40 lb (18 kg) by using the "Hardcore Package," which deleted the A/C, radio, speakers, amplifier, trunk carpet, hood pad, and tire-inflator. Its aerodynamic upgrades produced up to 1,000 pounds (4.45 kN) of downforce at 150 mph (241 km/h), roughly 10 times the downforce the standard Viper SRT-10 could produce at the same speed. The interior was upgraded only by the addition of a beacon-tripped lap timer (Hardcore Edition Only).

The Viper ACR was built alongside the standard SRT-10 at the Conner Avenue plant in Detroit. The aerodynamic components were produced by Plasan Carbon Composites and assembled to the vehicle by Prefix Corporation located in Rochester Hills, Michigan.

At SEMA 2014, Dodge presented a Viper ACR concept car based on the new VX I platform. The car was eventually introduced in 2015 for the 2016 model year. The base price of the 2016 ACR was US$121,395 in the United States and CA$159,995 in Canada.

The 2016 Dodge Viper ACR came installed with an all-new aerodynamic body kit made from carbon fiber, which included a new front splitter and a fixed carbon fiber rear wing, altogether producing a total of 680.5 kg (1,500 lb) of downforce at corners. The 8,382 cc (8.4 L; 511.5 cu in) Viper V10 engine generated the same power output of 645 hp (481 kW; 654 PS) at 6,200 rpm and 600 lb⋅ft (813 N⋅m) of torque at 5,000 rpm as in all other Viper trims. The brakes were from Brembo, with discs and calipers built specifically for the car. The discs became carbon ceramic, a first for the Viper series. The braking system contained 391 mm (15 in) discs with 6-piston calipers up front, and 360 mm (14 in) discs with 4-piston calipers at the rear. The tires were from Kumho, using a set of tires called the Kumho Ecsta V720 ACR, a variant of the V720 specifically built for the ACR. The front tires were P295/25R19Z, slightly smaller than the regular Viper, and P355/30R19Z at the rear. The suspension system was manufactured by Bilstein, which had 10 settings for rebound and compression tuning for the dampers.

One option for the car was the ACR Extreme Aero Package, which was the same package used to help the car break a total of 14 track lap records. This package included the addition of a removable extended front splitter extension, a new adjustable dual-element rear wing, four dive planes, six removable diffuser strakes, removable brake ducts, and removable hood louvers. This helped the car produce an extra 227 kg (500 lb) of downforce at corners, for a total of 907 kg (2,000 lb). With this package, the top speed was reduced to 177 mph (285 km/h) instead of 191 mph (307 km/h) because of the massive downforce produced by the car. At top speed, the car produced 799.5 kg (1,763 lb) of downforce, the most of any production car.

The Viper ACR has set numerous lap records. On September 14, 2011, on the Nürburgring, a 2010 Dodge Viper SRT10 ACR completed the sixth fastest production, street-legal car lap ever recorded with a 7:12.13 elapsed time. In February 2012, the Viper ACR-X posted a lap time of 7:03.058 around the Nürburgring, which was more than 9 seconds faster than the regular Viper ACR upon which it is based.

In October 2015, the ACR set a 7:01.67 lap time at the Nürburgring Nordschleife with the Extreme Aero Package, which was run by SRT and lapped by their test driver Dominik Farnbacher. This lap was unofficial according to SRT.

A crowdfund attempt started by volunteer Russ Oasis in 2017 on the GoFundMe funding platform began collecting funds to reclaim the lap record on the Nürburgring. He was supported by 377 people, and received sponsorship and assistance from Kumho Tire (tire supplier), Prefix Performance (logistics and parts supplier), ViperExchange (car loaners), and Fox Pro Films (lap filming). SRT test driver, racing driver, and former Nürburgring record holder Dominik Farnbacher returned to the track to help the group retake the record. Racing drivers Luca Stolz, Mario Farnbacher, and Lance David Arnold also participated. Their target was the second position car in street-legal vehicles, the Lamborghini Huracán Performante, which set a 6:52.01 lap record. The group went through three attempts, with lap times of 7:03.45 (set by Dominik Farnbacher), 7:03.23 (set by Mario Farnbacher), and 7:01.30 (set by Lance David Arnold). Their three-day trip to Nürburg, Germany ended with a crashed Viper ACR.

Despite the failure of surpassing the Huracán Performante, the team was still able to make the Viper ACR the fastest American, rear-wheel driven (with no additional assistance), and manual transmission equipped car to go around the track. Their lap time also brought the car to fifth position for street-legal vehicles.

The first Viper ACR (Phase SR II) set one lap record at Willow Springs in 2008. The Viper SRT-10 ACR originally set 13 lap records, with these laps set by Gary Thomason and SRT drivers Dominik Farnbacher and Chris Winkler. The Viper ACR (Phase VX I) originally held 14 lap records. The Nürburgring Nordschleife lap was specific to records for American-made, manual transmission, and rear-wheel drive cars. The lap times were set by racing drivers Randy Pobst, Tommy Kendall, Lance David Arnold, and SRT vehicle dynamics and development engineer Chris Winkler.

To commemorate the end of the Phase ZB II Viper and mend the gap until the release of the new car, Dodge offered an improved version of the ACR specifically designed to run in the Dodge Viper Cup Series. This car, named Viper ACR-X, added 40 hp (30 kW) to the basic ACR, a new set of downforce-enhancing front canards, long tube headers from American Racing Headers, and new materials that, along with a stripped interior, reduced weight to 3,300 lb (1,497 kg). It is a purpose-built race car and is not street-legal. According to Dodge, the car beat the regular record-holding ACR around Mazda Raceway Laguna Seca by about three seconds (1:33.9 to 1:31). The price increased by US$12,000, to $110,000. Production was planned for the spring of 2010.

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