Tech Tip – Cross Weight In asphalt circle track racing cross weight is defined as the total load that is resting on the Right Front and Left Rear tires added together and then divided by the total weight of the vehicle. The math will give you a percentage i.e. 52.1 % of cross. You should always remember that when you increase the weight on the Left Rear tire, you also increase the weight on the diagonal tire, the Right Front tire. As the car enters the corner, the load distribution changes as the car experiences lateral force. The load on the left side tires will be transferred to the right side tires. It is imperative that you anticipate the load transfer so that all four tires will have optimum loading or grip. Changes in the static cross weight can be accomplished by pre-loading the sway bar. Pre-load in the sway bar puts load on the right front and left rear tires which increases the static cross weight. Use a larger sway bar and the effect of pre-load on the car increases. If you want to pre-load the bar, put the car on your scales and you can quickly determine how much the cross percentage will change. Remember, as you change the front to rear percentage, the cross weight will also change and it will be time to re-scale the car. A general rule of thumb…. High banked race tracks = less cross weight… Flatter tracks = higher static cross weight.
Posted on: Mon, 14 Jul 2014 19:23:48 +0000
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