Dodge has released  performance details for the supercharged 2015 6.2-liter HEMI V-8 powering the Challenger SRT Hellcat. They  claim the highest horsepower and torque figures offered by any domestic performance car from the factory. We now know that it delivers over 700 horsepower and 650 foot pounds of torque. The new engine has been specifically revamped to  suit the supercharger application. It shares just 9 percent of its components with Dodge’s standard 6.4-liter V-8. The cast-iron block features revised water jackets to ensure optimum cooling and the rotating assembly boasts a forged-steel crankshaft with induction-hardened bearings, allowing it to withstand 1600 psi firing pressures.

High-strength, forged-alloy pistons swing on powder-forged connecting rods with high load-capacity bushings and diamond-like carbon-coated piston pins. The cylinder heads are heat-treated for improved thermal conductivity and the sodium-cooled exhaust valves feature hollow-stem construction and special steel-alloy heads that can withstand temperatures as high as 1,472 F (800 C).

The twin-screw supercharger is permanently sealed with premium synthetic oil and incorporates a drive ratio of 2.36:1 and a maximum drive speed of 14,600 rpm. It's 2.4-liter capacity is supported by integral charge coolers and an integrated electronic bypass valve that regulates boost pressure to a maximum of 11.6 psi. To accommodate the increased exhaust volume of the supercharged engine, the exhaust systems features a 2.75-inch diameter, straight-through, twin-exhaust system with electronically controlled sound.

The new Challenger SRT Hellcat is rear wheel driven via a six-speed manual trans swiped from the Viper and a eight-speed automatic is also available. Both are beefed up to handle the additional torque hence they are only available in the new Challenger SRT Hellcat. The package also incorporates heavy duty axles and a new asymmetric limited-slip differential offers  bias-ratio tuning. The differential further tightens to stabilize the car and prevent oversteer when trail braking.

The 2015 Challenger SRT Hellcat is fitted with 20-inch by 9.5-inch forged aluminum wheels shod with 245/45 Goodyear tires (Pirelli P Zeroes are optional).  The car is equipped with the largest brakes ever offered in a Chrysler car, with the  Brembo front rotors measuring 15.4 inches and complemented by six-piston calipers.

The 2015 Dodge Challenger SRT Hellcat now assumes the role of most powerful factory muscle car ever. the bar has been moved to 700 HP. Who's in?

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