what is weight transfer in a race car?

This force is then divided by the weight on the axle, This lateral acceleration is plotted against FLT, with reference steer angle as a parameter. usually, production based race cars will not have any front bar at all, and rely stricly on proper spring rates . This basically rules out weight distribution as a way of controlling roll angle component. 2. Weight transfer occurs as the vehicle's CoM shifts during automotive maneuvers. The weight transfer setup recognizes the importance of ride height and roll stiffness in determining a good balanced set up for the car. Your shock absorbers are considered after your ride and roll stiffness have been selected. The next topic that comes to mind is the physics of tire adhesion, which explains how weight transfer can lead to understeer and over-steer conditions. Figure 12 shows a finite element stress analysis, with colours closer to yellow and green indicating higher stresses. In a single axle, the roll resistance moment will be the roll angle multiplied by the roll stiffness of the axle analysed, . In this figure, the black and white pie plate in the center is the CG. Car Handling Basics, How-To & Design Tips ~ FREE! The driver has hit the apex but has found the car is starting to push wide of the desired line. 3. The weight of an IndyCar race car should be at least 712 kg, with an average of 1630 lbs or 739.5 kg. Before I explain this, let me talk about a good thing to understand the subject the steady-state analysis of a pair of tyres. Here the pickup points are highlighted for better comprehension. NOTE: This information is from an NHRA Rule Book 2019 Addendum. The net loss can be attributed to the phenomenon known as tire load sensitivity. Roll stiffnesses were input in the form of roll rate distribution, varying from 0 to 1. This is multiplied by the cosine of the reference steer angle, to obtain a lateral force in the direction of the turning centre. First notice that there are two particular regions in the plot, where any changes to one of the components will produce no sensitive effect on weight transfer. This article explains the physics of weight transfer. Some large trucks will roll over before skidding, while passenger vehicles and small trucks usually roll over only when they leave the road. Referring to the figures, we have illustrated a street car weighing 3000 lbs, and with a typical FWD street car's weight distribution of 60% front and 40% rear. This component of lateral load transfer is the least useful as a setup tool. In a dirt race car, our setups determine where the weight that has transferred goes. This results in a reduced load on the vehicle rear axle and an increase on the front. While the skills for balancing a car are commonly taught in drivers schools, the rationale behind them is not usually adequately explained. For example, if our car had a center of gravity 1 foot above the ground and the tires were 4 feet apart, we would divide 1 foot . The car should be at minimum weight, using ballast as needed to make the proper weight. The added axle weight will slow the release of the stretch in the tire and help hold traction longer. This happens because raising the roll centre in any axle will approximate the roll axis to the sprung weight CG.

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