Adam: "This Is So Wrong!"
Now that we had our backward Porsche, the producers secured an unmodified silver 928, and we set out for the MythBusters' favorite test site, the runways of the decommissioned Navy base in Alameda, just across San Francisco Bay. The plan was to run the cars side by side up to 100 mph, shift into neutral and coast to the end of the runway. The car with the lower drag coefficient (Cd) would take longer to slow down, pulling ahead of the high-drag car and finally putting an end to this automotive mystery. Why 100 mph? Because aerodynamic drag climbs with the square of velocity, so the higher the speed, the bigger the difference, if any. We also pointed the cars into a 15-mph headwind—higher airspeed equals more drag—and added 30 pounds to our bizarro Porsche so the two cars weighed the same. Adam drew the short straw, so he drove our project car and endured the heat that poured from the radiator onto his balaclava'd head. Jamie piloted the unmodified Porsche. My job wasn't over: As the guys blasted down the runway, I manned the radios.