The Dodge Viper ACR has always been uncompromising, but German firm GeigerCars has managed to up the ante in a significant way. The massive 8.4 liter V10 puts out 645 native horsepower from the factory, but GeigerCars bumps that up to 765 horses while maintaining the car's naturally aspirated character. They achieve this through through work on the engine itself with increased diameter intake valves, a more aggressive high-lift camshaft, new hydraulic lifters, pushrods, and double valve springs. Final work to the heads includes traditional porting and polishing. New exhaust headers, and a stainless sports exhaust system with 200 cell sport cats allow for improved airflow. The ECU was also remapped for increased power.
A carbon fiber Extreme Aero package features a front air splitter, twin dive flaps on the front apron, and a rear diffuser.
Other features include an oil cooler system on the rear axle with an electric pump.
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A general conversation about American sports car legends often starts with the sleek Corvette, or iconic pony cars like the Ford Mustang, before moving on to the Dodge Viper, a relative youngster in US Muscle Car folklore.
Named after a poisonous snake, the Viper’s standout feature is its powerhouse 8.4 litre V10 motor. With 645 hp out of the box, this engine needs no further tuning for life in the street-legal Club Racing spec Viper ACR.
While this highly focused Viper flagship model has been available from GeigerCars.de for several months, the Munich-based US car specialist now offers a comprehensive tuning package that includes an uprated engine and forged alloy wheels. Thus converted, the 765 hp GeigerCars Viper ACR is a totally uncompromising supercar for both road and track.
• Uprated V10 with 765 hp / 920 Nm
• Carbon-fibre body kit and forged wheels
• Production car from 179,900 euro
Karl Geiger and his team extracted the extra 111 hp from the giant 8.4-liter V10 engine using classic naturally aspirated tuning - ported and polished cylinder heads, larger 2.215-inch diameter intake valves, high-lift camshaft, uprated hydraulic lifters, pushrods, and double valve springs.
Various other upgrades for the drivetrain of the ACR come from the GeigerCars Viper tuning programme. These include the exhaust headers, 200-cell Sports catalytic converters and a stainless steel sports exhaust system for reduced backpressure and a thoroughbred racecar soundtrack.
Finally, the ECU is remapped to make full use of the new hardware, and a rolling road dyno chart is supplied with the conversion as proof of the enhanced power output.
In order to ensure reliability and longevity of the engine in hard track use, GeigerCars installed a more efficient engine oil cooler. The rear axle also gains an oil cooler system, which includes an electric pump.
The ‘Extreme Aero Package’ is designed to improve downforce at high-speeds and includes a large front air splitter, twin dive flaps for the front apron and a rear diffuser. To reduce unsprung weight, GeigerCars offer forged alloy wheels in 11.0 and 13.0 x 19-inch sizes, including tyre pressure sensors.
The price of the GeigerCars conversion for the Viper ACR is 40,775 euro including tax. The GeigerCars Viper ACR including the "Extreme Aero Package" is available as a complete car from 219,000 euro.
Displacement: 8,382 cc
Power: 563 kW (765 hp) at 6,400 rpm
Torque: 920 Nm at 5,500 rpm
Transmission: 6-speed manual
Consumption: City/highway/combined: 18.1/12.7/15.2 L/100km (Super)
CO2 emissions, combined: 380 g/km
Efficiency class: G
Emission Class: EURO6
Geiger-performance kit: 765 hp / 920 Nm
(Consists of ported and polished cylinder heads, larger 2.215 inch intake valves, high-lift camshaft, uprated hydraulic valve lifters, pushrods, dual valve springs.)
Stainless steel exhaust system, tubular headers, sport catalytic converters
ECU remapping - including rolling road power graph
Engine oil cooler, rear axle oil cooler incl. pump
GeigerCars forged alloy wheels, 11.0x19 and 13.0x19-inch