It’s the more powerful Viper ACR nobody asked for (but we’re glad exists).

Logically speaking, the Dodge Viper ACR doesn’t need any more power. Its monumental 8.4-liter V10 puts out 645 horsepower and 600 pound-feet of torque as it is. But don’t tell the crew at GeigerCars in Germany that, they just went ahead and tuned the Viper ACR to a slightly crazier figure.

With 765 horsepower, the company was able to extract an extra 120 horsepower from the already potent supercar the good ol' fashion way - with simple tuning. The stock 8.4-liter V10 was given larger, 2.215-inch diameter intake valves, a high-lift camshaft, uprated hydraulic lifters, pushrods, and double valve springs. 

Other upgrades include headers, catalytic converters, and a stainless steel exhaust system. A final remapping of the ECU, and all that new equipment is put to use. No turbo necessary.

To pair with all that extra power, GeigerCars included an ‘Extreme Aero Package’ that tacks on to the already aggressive aero package the Viper ACR comes with stock. The upgrades range from a front splitter, to twin dive flaps on the front apron, to a new rear diffuser, all topped off with some lightweight forged alloy wheels.

The total price of the package comes to €40,775 ($46,165), not including the price of the Viper ACR. Or you can just pick up a complete car for a cool €219,000 ($247,973).

Source: GeigerCars

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GeigerCars Dodge Viper ACR

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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.

Specifications, Dodge Viper ACR by GeigerCars.de

Engine: V10

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

GeigerCars Components

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