Teams have to get very aggressive with setup. They will try to get the car on the ground like a hunting dog, with the nose down and tail up. Plus, there’s just no substitute for horsepower at that place as drivers stay in the throttle for most of the race.When we discuss setup, you’ll hear the term “coil-binding” as teams go as low as they can without dragging the track. They use very soft front springs that are precision wound with every coil spaced the same amount down to the thousandth of a millimeter. As the car travels down on the racetrack, all of the coils touch each other right before the car touches the racetrack. The car won’t travel anymore because the spring is solid, and it’s right against the track for maximum downforce. It’s very hard for teams to work on coil-binding at the racetrack. Most setups are worked out in the engineering departments of these race teams. It’s one reason teams won’t change their springs at the track because their engineering group has figured out the setup. With the Car of Tomorrow, NASCAR will allow teams to run the bump-stops like we used to race when I was a crew chief. It’s a lot like the rubber bumpers on top of a passenger car’s rear-end housing. If a car hits a big bump, the chassis won’t bottom out against the rear-end on the corner. News source: Crew Chief Club