| that you eliminate variables and focus on the direct effects of the foam. In other words, improve signal/noise ratio. Therefore, gpad tests are out because there are about umpteen variables that affect grip. That would be a very bad choice. I suggest some sort of test in which you stress the chassis and then measure deflection. For instance, jack the car up and place two jackstands under the rear subframe. Lower the front of the car onto two jackstand which are located somewhere behind the front wheels. Once the chassis comes into contact with the front jackstands, measure deflection of the chassis as you continue to lower the jack. If the foam is indeed stiffening the frame, you would expect to see less deflection in this measurement after you've injected the foam. This is merely one example of several similar test that could be conducted to measure the effects. Another good test (and probably more important from a chassis dynamics point of view) would be one that measures torsional deflection (twisting action), but it's probably also harded to accomplish. Point is, *directly* measure how much stiffer it makes the chassis. For each setup (foam vs nofoam) take at least three measurements so that someone can assess the quality of your measurement system, i.e., Gauge R&R. For those that wonder what engineers do all day, this is an example.
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