# Pacejka Formula - natural values

For my racing game I am using a simplified Pacejka Magical Formula:

$\mu_{lateral} = \mu_{0} * \mu_{1} * D * \sin(C * \arctan(B * x - E * (B * x - \arctan(B * x))))$

Where:

• $\mu_{lateral}$ is sideways coefficient of friction
• $\mu_{0}$ is wheel friction coefficient
• $\mu_{1}$ is surface coefficient friction
• $B$ is wheel lateral stiffness
• $C$ is wheel lateral peak factor
• $D$ is wheel lateral shape factor
• $E$ is wheel lateral curvature

However, I don't know what are realistic values for $B, C, D, E$. I know well the first ones and I also assume that $C$ may be around 1.1. However, what's realistic stiffness, shape factor and curvature in sideways directions for different types of real-life tires?

• Thanks for information. So $F_{z}$ is the load on wheel, right? Than I have it, with all the suspension stuff etc. That's great:) So I must try plugging up all the things. However, I'll still need to find out theese values for several tire types. – Adrians Netlis Mar 13 '16 at 21:59