Factory NSX-R wind tunnel testing data provided by Honda Co. Ltd Japan:
-Overall Clf (lift coefficient/front): -0.100 reduction value
-Front Clf: -0.040 reduction value
-Rear Clf (lift coefficient/ rear): -0.060 reduction valueCd (coefficient of drag): 0.32
At 112 mph, this data translates to a vertical force of 80 pounds on the front tires and 55 pounds on the rears. When planning to add aero to your NSX, be sure to properly balance the car. For instance, the NSX is balanced at 42 percent in the front and 58 percent in the rear. So ideally you don't want to add downforce only to the rear, because this will throw off the balance of the car-especially high-speed stability.