The Dodge Viper SRT10 ACR-X is a track-only version of the Dodge Viper SRT10 ACR.
To commemorate the end of the Phase ZB II Viper and mend the gap from the car's production end 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 to the basic ACR 40 hp (30 kW) with the tuned 8.4L V10 engine, 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 3300 lb (1497 kg).
The ACR-X 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). Price increased by US$12,000 to US$110,000. Production was planned for the spring of 2010. As of February 17, the Viper ACR-X's Nürburgring lap record is 7:03.058, a full 9.072 seconds faster than the regular ACR.
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The Dodge Viper SRT10 ACR-X is a Tier 4 vehicle. It requires 80 stars to unlock and costs 110,000 Cash.
The Dodge Viper SRT10 ACR-X largely follows in the performance footsteps of the Dodge Dart GT, with a bias towards top speed and handling at the expense of all other performance aspects, most notably nitro.
Originally priced at 45,000, 60,000, then 68,000, the Dodge Viper SRT10 ACR-X, as of the Motorcycles Update, costs 77,000 to buy. The cost to max out is 455,500, while Pro Kits require 177,219, 4 of each Class A Parts card, 2 Initial Tech cards, 2 Early Tech cards, and 8 Mid-Tech cards.
Given the car's poor nitro efficiency and acceleration, the Viper SRT10 ACR-X is not recommended for use in Events except Dodge-only ones.
In Career mode, this car, alongside the Cadillac CTS-V Coupe Race Car and Chevrolet Corvette C7 are normally primary choices, with each car having their own paramounts to be useful for most of the Class A races.
Given the car's bias towards top speed, it can be quite easy for beginners to use with not much nitro management skill needed, allowing the car to finish up all Class A Career races up to Season 6. Although the CTS-V is considered as a better starter car, it is only usable till Season 6, just like the Viper. On the other hand, the C7 and Sesto Elemento are capable of completing all Class A events in Career mode if used right, making the Viper a rather questionable choice as a starter car.
In Multiplayer, the car underperforms, especially due to its rank and performance, which is unsurprisingly due to the car being intended for starters and not as a formidable Multiplayer competitor. As such, even with the best-tuned MP-friendly upgrade configuration, it isn't as competitive as even the Sbarro Alcador. The Viper SRT10 ACR-X, on the other hand, is one of the Enduro Cars used for the BXR Bailey Blade GT1's Enduro Double Down event, the details of which can be found here. It was later used in the Porsche 918 Spyder with Weissach Package's EDD.
The Viper SRT10 also counts towards various collections.