No matter what you do, you will not be able to get the maximum force on the dummy exactly equal to the lowest possible maximum force because of the design of the airbags and seat belt. In the Gizmo, the seat belt is modeled as a spring, so the force of the belt increases as it is stretched. The airbag takes a few milliseconds to get into position. As a result, the dummy does not hit the airbag right away. How do these limitations affect how well the safety system can protect passengers in the car