#Cross weight oval racing driver
#Cross weight oval racing series
#Cross weight oval racing free

The actual load transfer depends on the track width and the rolling moment produced by the lateral acceleration acting on the fictitious CG height.This is the basic output of a pair analysis. This graph is called the potential diagram, and it reflects the potential of a pair of tyres arranged on a track to generate lateral “axle” force. This lateral acceleration is plotted against FLT, with reference steer angle as a parameter.This force is then divided by the weight on the axle, to give the lateral acceleration in the direction of interest. This is multiplied by the cosine of the reference steer angle, to obtain a lateral force in the direction of the turning centre. The lateral force of the track is the sum of lateral forces obtained from each tyre.At this point, tyre data is entered and lateral force for each tyre in the axle is calculated taking into account the effects described above (if the case demands it).For a more comprehensive analysis, the effects from suspension geometry such as steer and camber variations due to ride, roll, braking, accelerating, lateral force compliance or aligning torque compliance, can be introduced before entering tyre data.A reference steer angle, which is the average of steer angles of both wheels on the axle, is specified (but the individual slip angles are used when entering the data).

#Cross weight oval racing series

Then, a series of steer angles in the range of interest is selected. The actual wheel loads are calculated for a series of FLT, which can go from 0 to 1.0, for the given track load.In cases where the performance of a pair of tyres is being analysed without regards to a particular vehicle, the parameter is a convenient way to represent changes in lateral load transfer. The parameter represents the total moment in the track about a point on the ground. It may be a more practical way to assess vehicle handling in comparison to computer modelling, since the goal is generally to increase the lateral force on either the front or rear track.Īlso, the only direct link between the front and rear tracks is the chassis (all-wheel drive cars are an exception), and vehicle behaviour can be evaluated by looking at the relative performance of front and rear tracks.įor the analysis procedure, one can adapt the load transfer equation obtained above, using, the weight on the track analysed, instead of, and, the height of a fictitious “centre of gravity” for the track of interest, instead of. In a pair analysis, steady-state lateral force is obtained for the tyres on a track (front or rear pair), through data from a single tyre. This analysis may even be used to prepare tyre data, in order to make the bicycle model more realistic. Let us expand that analysis by looking at the pair of tyres. In the previous post about understeer and oversteer, we have addressed the vehicle as the bicycle model, with its tracks compressed to a single tyre. Here, is the lateral acceleration in G units, is the weight of the car, is the CG height, is the track width and and are the vertical loads on the left and right tyres, respectively. In the image, the car is looked from the rear in a right hand turn.

#Cross weight oval racing free

The total lateral load transfer on the car can be calculated from its free body diagram, as shown in figure 1. In other words, it is the amount by which vertical load is increased on the outer tyres and reduced from the inner tyres when the car is cornering. Lateral load transfer or lateral weight transfer, is the amount of change on the vertical loads of the tyres due to the lateral acceleration imposed on the centre of gravity (CG) of the car. Then, most of the solutions available will be related to the subject of this post: lateral load transfer. The fact that the problem occurs in the slowest bits of the circuit might rule out the possibility of aerodynamic changes as a solution. Well, a thousand changes to the car could be applied. What would you do, in order to solve the problem?

#Cross weight oval racing driver

In a brief feedback after the first outing (a set of laps in a session) of the free practice session, the driver complains about excessive oversteer in these parts of the circuit. Let’s say that you are a race engineer and your driver is having trouble to go around the slowest corners on the circuit.