Ultimate combination of the Viper ACR and the Viper Competition Coupe


The ultimate combination of the street-legal Viper ACR and the track-only Viper Competition Coupe, the Viper ACR-X churns out a heart-stopping 640 hp, pushed to the limit with a variety of modifications including headers and a low-restriction exhaust system. Track-tuned suspension and aerodynamics, plus a factory-designed roll cage, fuel cell and race seat mark the ACR-X as a serious racing contender, for serious racers who demand extreme performance..

During the development of the ACR-X, spectacular lap times were posted at Mosport (1:20.6), Sebring (2:08.72) and Moroso (1:17.14)..

With all that power at the ready, Viper ACR-X owners put their racing skills to the test in the Viper Cup, sanctioned by the Viper Racing League. After all, the only thing better than entering the X-dimension is beating another driver to it..

For more information on the ACR-X, call Viper Race Headquarters at 888.960.3333.

VIPER ACR-X SRT Specifications


Body Style Coupe
Assembly Plant Conner Avenue, Detroit
Type and Description 10-cylinder, 90 degree V-type, liquid cooled
Displacement 8.4 liter (510 cid)
Bore x Stroke 4.055 x 3.96 (103 x 100.6)
Valve System OHV, Variable-Valve Timing (VVT), 20 valves,
roller-type hydraulic lifters
Fuel Injection Sequential, multi-port, electronic
Construction Aluminum alloy block with cast-iron liners,
aluminum-alloy heads
Compression Ratio 10.2:1
Power (SAE net) 640 bhp (477 kW) @ 6,100 rpm (76 bhp/L)
Torque (SAE net) 585 lb.-ft. (793 N.m @ 5,100 rpm)
Max. Engine Speed 6,250 rpm
Fuel Requirement Unleaded premium – 91 Octane (R+M)/2
Oil Capacity (with Filters) 11 qt. (10.4L)
Coolant Capacity 16 qt. (15L)


Description Synchronized in all gears, electronic reverse
lockout mechanisms, new short-throw shifter
Gear Ratios 1st – 2.66
2nd – 1.82
3rd – 1.30
4th – 1.0
5th – .80
6th – .50
Axle Ratio 3.07
Final Drive Description Frame-mounted hypoid bevel gear with GKN
ViscoLok speed-sensing limited-slip differential
Wheelbase 98.8 (2510)
Track, Front 61.6 (1565)
Track, Rear 60.9 (1547)
Overall Length 175.6 (4459)
Overall Width (at Sills) 75.2 (1911)
Curb Weight 3190 lbs.
Weight Distribution 49/51
Aerodynamic Downforce (@150 mph) 1100lbs.


Defroster Front Blower
Footrest Driver’s, aluminum die-cast-style adjustable
pedal pad
Instrument Cluster 220-mph (355 kph) analog speedometer, trip
odometer, 7,000 rpm tachometer, voltmeter, oil
pressure, coolant temperature and fuel gauge
Mirror Manual day/night rearview
Pedals Power-adjustable
Seat RaceTech racing driver side
Steering Column Tilt
Steering Wheel Suede-wrapped quick-disconnect racing style


Body Panels Primed, ready to paint
Dive Planes Front quad
Headlamps High-Intensity Discharge (HID) low and high beams
Mirror Dual outside
Splitter Front carbon-fiber with rub strip
Windshield Wipers Variable intermittent, two-speed with low-profile
flat blades
Wing Rear carbon-fiber with seven-position stanchions
Optional Custom Livery Design
Car Cover Fitted


Differential GKN ViscoLok speed-sensing limited-slip
External race cooler package
Dyno Break-in and Performance Verification
Electronic Seals
Engine, Transmission and Differential
Engine Electronic Control Unit Upgraded performance program
Exhaust System Dual-side
Flywheel Lightweight
Headers Exhaust
Oil Cooler Engine
Pulley Underdrive Crankshaft


Bar-Front and Rear Anti-Sway Adjustable Drop Links Four-wheel independent with high-performance aluminum control arms and knuckles, KW suspensions with two-way adjustable competition coil-over shock absorbers with remote reservoir tubular stabilizer bars, shocks and springs
Type Power-assisted rack-and-pinion
Overall Ratio 16.7:1
Steering Turns (lock-to-lock) 2.4
Anti-Lock Brake System (ABS)
Front – Size and Type
14.0 x 1.26 (355.0 x 32.0) vented disc, with Brembo 44/40 opposing piston calipers, curved fin vented StopTech two-piece slotted rotors
Rear – Size and Type 14.0 x 1.26 (355.0 x 32.0) vented disc, with Brembo 42/38 opposing piston calipers, curved fin vented StopTech two-piece slotted rotors
Power-assist Type Tandem Diaphragm vacuum with zero lost travel
Gloss black-painted wheels
Type and Material
Lightweight forged aluminum “sidewinder”
Size 18.0 x 10.0 – front, 19.0 x 13.0 – rear
Adjustable Pedals Anti-Lock Brake System (ABS) Four wheel
Battery Dry Cell
Cage Interior roll cage, 8-point
Energy-Absorbing Steering Column  
Extinguisher Fire
Fuel Cell Tip-over discriminator valve
Hooks Front and rear tow
Padding Interior roll cage impact protection, SFI rated
Knee bolster  
Nets Side window and center mounted
Remote Battery Switch Emergency
Alternator 180 amp high speed
Seating Capacity 1