Jeep has added a new "Launch" button to the 2014 Grand Cherokee SRT8. Hold the brake pedal, push the button which has a "Christmas Tree" icon, floor the gas pedal and the Jeep will hold a predetermined rpm until you release the pedal. Release the pedal and experience an AWD 4.2 0-60 launch (under ideal conditions). The reporter for the story was turning out consistent 4.5s.
What does this insanely awesome button do? - Yahoo! Autos
By spelled out, we mean the whole word, "Launch," appears on the button to designate the 470-horsepower, all-wheel-drive Jeep SRT8's Launch Mode. There are no acronyms or guessing with this button. What the button does is also made clearer by the awesome depiction of a drag strip's starting-line lights, aka a "Christmas tree."
Jeep's launch control is standard on SRT8s for consistent, enhanced fast starts of the high-performance SUV. Launch Mode brings the engine, suspension, transmission and driveline together for fast launches from a standstill by revving the engine at a standstill and launching the 5,000-pound SUV like a rocket.
What does this insanely awesome button do? - Yahoo! Autos