The IC is a reference point that helps us to calculate the correct layout for minimal bump steer. This introduces horizontal displacement within the tie rod and causes unwanted steering.īump steer is caused when the tie rod’s hypothetical inward extension (imaginary line) doesn’t intersect with the instantaneous center (IC) formed by the upper and lower wishbones. Because the tire rod is shorter in length and because it doesn’t rotate about the IC point, it travels in a different arc.Remember, the tie rod is what makes the wheel steer. The problem arises because the tie rod is shorter than the control arms.When the three components move up and down, they travel around an arc (because they pivot around a fixed point).In other words, they’ll all move up at an equal distance. Upper control arms, lower control arms, and tie rod - all three will experience the same amount of vertical displacement.Now, let’s look at what exactly happens when you drive over bumps: The function of tie rods and control arms.Instant center - as seen in our guide to suspension roll center.Wheel toe angles - we’ve explained this in our suspension geometry guide.To better understand this concept, it’ll help to have a good grasp of the following: For the sake of simplicity, we’ll explain this in the context of a double-wishbone + rack and pinion setup. Let’s try to understand why this happens. In other words, it makes your steering twichy and unpredictable. It is a result of misalignment in the steering system which causes the wheels to steer automatically when going over a bump - without any input from the driver. Bump Steer Explainedīump steer is a common and unavoidable problem. In this guide, we’ll explore this phenomenon, understand what causes it, and we’ll look at how to correct it. Even the fastest cars with the best suspension systems in the world can be plagued with bump steer.Įven though it can be corrected, eliminating bump steer is next to impossible. So much of what keeps your car going in the right direction is hidden away under a blanket of complex machinery.īut despite the impressive engineering, it’s not perfect. The automotive steering system is an engineering marvel. Each split second counts and the last thing you want is your car steering spontaneously when going through bumpy corners. When you’re at the track, the importance of being able to position your car accurately cannot be overstated.
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