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It’s official: Supercharged 6.2 Hemi

by David Zatz on

After literally years of rumors, the 2015 Dodge Challenger SRT became official today, with a “600-plus horsepower” Hellcat engine. The 392 Challenger SRT will return for 2015, as well.

Tim Kuniskis, President and CEO of Dodge, said, “Dodge is the Mainstream Performance brand, and now combined with SRT, we are able to unleash a true GT car with an all-new driver-focused interior and the TorqueFlite eight-speed transmission combined with the most powerful V-8 Chrysler has ever produced. The Challenger Hellcat has been released!”

Production is scheduled to begin in the third quarter of 2014.

Dodge has not released the power rating of the supercharged Hemi engine,  but said its horsepower rating would be the highest of any V8 in Chrysler’s history (the second highest belongs to the current Challenger SRT’s 392 Hemi engine, at 485 hp.)

The new V-8 engine can be mated with an upgraded six-speed manual transmission or a beefy new TorqueFlite eight-speed automatic.

The breakthrough supercharged engine uses a forged-steel crankshaft with induction-hardened bearing surfaces, which can withstand firing pressures of 110 bar (1,595 psi) – the equivalent of five family sedans standing on each piston, every two revolutions. Its unique crank damper has been tested to 13,000 rpm. High-strength, forged-alloy pistons, developed using advanced telemetry measurement, are coupled to powder-forged connecting rods with high-load-capacity bushings and diamond-like-carbon-coated piston pins. The supercharged 6.2-liter Hemi V-8 has heat-treated aluminum-alloy cylinder heads optimized for superior thermal conductivity, with Hemi Orange die-cast aluminum rocker covers.

The 392 engine power has been upgraded from 470 to 485 horsepower, with torque climbing from 470 to 475 lb-ft. It, too, can be paired with either a six-speed manual or eight-speed automatic.

Hellcat-equipped cars will come with two key fobs, red and black; the red key fob unlocks the full horsepower and torque of the Challenger SRT Hellcat engine, while the black fob limits engine output. There is also a Valet Mode with a four-digit PIN code.

Drive Modes control horsepower, transmission shift speeds, steering (Challenger SRT only — not Hellcat)), paddle shifters, traction, and suspension. Drive Modes are pre-configured for Sport, Track and Default settings, with a Custom setting as well. Sport provides better performance; Track provides maximum performance on smooth, dry surfaces.

The 2015 Dodge Challenger SRT rides on new, SRT-exclusive “77” eight-spoke 20 x 9-inch forged-aluminum black wheels. Standard 245/45ZR20 Goodyear RSA2 All-Season or available Goodyear F1 Supercar Three-Season tires deliver serious grip and handling.

Standard wheels on the Challenger SRT with the Hellcat engine are new “Slingshot” split-seven spoke 20 x 9.5-inch, lightweight forged-aluminum wheels with a matte black finish (also used on the SRT 392 as part of the SRT Track Pack). Available on the Challenger SRT Hellcat are 20 x 9.5-inch, lightweight forged-aluminum wheels with a Brass Monkey/dark bronze finish.

New P275/40ZR20 Pirelli P Zero Nero tires (front and rear) provide all-season traction, while Pirelli P Zero tires are available for three-season performance driving.

The SRT with Hellcat has the largest front-brake package ever offered in an SRT vehicle, with 390-mm (15.4-inch) Brembo two-piece rotors with six-piston calipers; this is also available on the 392 HEMI® SRT model as part of the SRT Track Pack. New anti-lock braking system (ABS), ESC and traction control systems are configurable for specific tire and powertrain configurations.


Inside the 2015 Dodge Challenger is a new cockpit inspired by the interior of the 1971 Challenger.

The new instrument panel has a stamped aluminum bezel; a 7-inch configurable display is centered in the gauge cluster, with new analog gauges on either side, drawn from the “tic-toc-tach” 1971 designs. With the Hellcat, the gauges and graphics are both finished in a dark Radar Red tone.  New for 2015, drivers can select a background for the 8.4 inch touch-screen.

The aluminum trim gets one of two finishes, “Hectic Mesh” for the Challenger 392 SRT and “Dark Engine Turn” for the Challenger SRT Hellcat. The center console houses redundant button and knob controls for the audio and climate system; a new media hub with an SD card slot, USB outlet, and audio jack is inside the center console’s armrest.

The TorqueFlite eight-speed automatic transmission has a new electronic shifter with a driver-oriented T-handle for intuitive gear selection, and an Auto Stick selector gate. The track-proven Tremec TR6060 six-speed manual transmission has a throwback ball shifter.

A redesigned SRT-branded heated steering wheel has a flat bottom and available paddle shifters (with automatic transmission). This new tilt-telescoping steering wheel also has a 360-degree heat element. Seat comfort has also been improved, and ventilated/heated front seats are standard. The passenger seat has an easy exit/entry system for rear seat access. Seats are covered in Nappa leather/Alcantara material with embroidered SRT logo, with Laguna leather,  either sepia or black with embossed SRT logos, available as part of an equipment package.

For more details, see our permanent 2015 Dodge Challenger SRT page (updated with more photos and powertrain details).

Allpar first reported on a supercharged 6.2 Hemi coming down the line on June 18, 2012. At that time our sources were predicting 700 horsepower, and based on experience with such predictions, we assumed it would end up at around 580-600.  Eventually, as more news came in, we bumped that estimate up to 640-680 horsepower, but since it will be paired with an eight-speed automatic (in Dodge Charger and as an option in Dodge Challenger SRT), we also assumed torque would be limited to 640 lb-ft of torque.

Allpar’s predictions of the Hellcat logo and dual power levels have both been shown to be correct. Thank you, oh2o, Danno, Mr. Source, redriderbob, and others who provided advance info!

For more details, see our permanent 2015 Dodge Challenger SRT page.

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