![]() So, for example, you might use 500 pounds of force coming into the corner, but as you get back into the gas, you don’t have the same amount of force trying to push back on the suspension. But with bump stop packages, we can intentionally dial in more hysteresis. Springs essentially have no hysteresis-it’s going to apply more or less the same amount of force in extension as it does in compression. If I’ve got a bump stop that builds 100 pounds of rate at a quarter-inch of compression, it can have 50 pounds of force in extension if I design it that way. Polyurethane and polyurethane foam bump stops also have a certain amount of hysteresis built into them, and that means the stop behaves different in compression than it does in extension. That progressive character allows for a larger margin of error than a bump spring typically does. These are inherently progressive-the further you get into the bump stop, the more rate it gains. If your setup is off a little bit or you change your driving line, polyurethane bump stops tend to be less harsh and less likely to cause instability or change your grip levels. ![]() One advantage that bump stops have over bump springs is that bump stops tend to be more forgiving on rougher tracks. That way you’re not setting up the race car to deal with this one anomaly on the track. For example, if you want to run 500-pound springs in the race car, but there’s this one dip or bump in the track that would require 600-pound springs to prevent the suspension from over-traveling, you can use a bump stop to do that. In this type of application, bump stops are typically used to mitigate the problems that could be caused by an anomaly on the track surface. You generally don’t see ride height rules in that type of racing, and if there are ride height rules, they’re usually close to where you want it to be anyway. Bump stops keep the suspension operating in a small window of travel so we can have better control of variables like the camber curve, the caster curve, and the load on the wheels.īump stops also see a lot of use in road racing formats, but the purpose is a bit different. So the goal is to get the car as soft as possible and as close to the ground as we can. The use of bump stops in these cars really all stems from ride height rules, and those rules typically specify heights that are much higher than are ideal. We want to get the car down to where we want it to ride, and we want to stay there in a pretty small window of suspension travel. In circle track racing, bump stops are generally used to control the dynamic attitude of the car. There are situations where they offer advantages over a bump spring, but there are also situations where a bump spring might be a better option. The general purpose of a bump stop really depends on the application it’s being used in. Our experts weigh in on the applications where each solution is most effective, and why.īump Stops ADVOCATE: Jason Enders, RE Suspension That results in unique advantages in some situations and compromises in some others. Although these suspension components perform similar tasks, the two designs use different approaches to accomplish those goals.
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