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Cobb Tuning

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Anti-roll bars provide two main functions. The first function is the reduction of body lean. The reduction of body lean is dependent on the total roll stiffness of the vehicle. Although Anti-roll bars reduce body lean, this comes at the expense of increased load transfer at the end it is applied to. To keep the body level in cornering, the bar pulls up on the inside tire (therefore under loading it) and pushes on the outside wheel (over loading it). Anti-roll bars therefore reduce overall grip at the end they are installed to. This is because load transfer always decreases the overall grip of a pair of tires, due to the fact that coefficient of friction decreasing with load. This decrease in grip from load transfer overwhelms the increase in grip from the more optimal camber caused by less roll. The net effect, then is less grip at that end of the car.The other function of anti-roll bars is to tune the handling balance of a car. Understeer or oversteer behavior can be tuned out by changing the proportion of the total roll stiffness that comes from the front and rear axles. Increasing the proportion of roll stiffness at the front will increase the proportion of the total load transfer that the front axle reacts and decrease the proportion that the rear axle reacts. This will cause the outer front wheel to run at a higher slip angle, and the outer rear wheel to run at a lower slip angle, which is an understeer effect. Increasing the proportion of roll stiffness at the rear axle will have the opposite effect and decrease understeer.