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I’d expect that a car’s Cd would improve by simply lowering it an inch. According to the Bosch Automotive Handbook, lowering a standard car by 30mm without any other changes should decrease the Cd by about 5%. The actual results will depend on the individual model of car being tested, but Mercedes, Volkswagen, etc. do lower all of their “efficiency” models to decrease wind resistance.The bottom of a car will probably always have more wind resistance than the top simply because of the spinning wheels jutting down into the airflow. When you lower the car, some of the air that would have flowed past the rough underbody will flow over smoother top instead.
I’d expect that a car’s Cd would improve by simply lowering it an inch. According to the Bosch Automotive Handbook, lowering a standard car by 30mm without any other changes should decrease the Cd by about 5%. The actual results will depend on the individual model of car being tested, but Mercedes, Volkswagen, etc. do lower all of their “efficiency” models to decrease wind resistance.
The bottom of a car will probably always have more wind resistance than the top simply because of the spinning wheels jutting down into the airflow. When you lower the car, some of the air that would have flowed past the rough underbody will flow over smoother top instead.
