The Dodge Challenger SRT Demon was engineered to lift its front wheels off the line from the factory, with 840 horsepower and a 9.65 second quarter mile. So when a prototype turned up at a racing event with an audible engine knock, the question everyone had been quietly asking finally surfaced. Read on for what detonation actually does to a supercharged engine, and why a prototype failure is not the same as a design flaw.