Spring rate is the ratio of the change in force to the change in displacement of a spring. It is usually expressed in units of pounds per inch (lb/in) or newtons per millimeter (N/mm). A higher spring rate means a stiffer spring that resists compression more, while a lower spring rate means a softer spring that compresses more easily. Spring rate affects how your vehicle responds to bumps, corners, braking, and acceleration.
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Springs with higher spring rates require more force to compress and are generally stiffer, while lower spring rates indicate softer, easier-to-compress springs. Absolutely! The spring rate significantly influences a vehicle's handling and ride characteristics. Higher spring rates provide better stability during cornering and braking but might compromise comfort. Lower spring rates offer a smoother ride but can lead to more body roll and reduced stability during aggressive maneuvers. The right spring rate balance is essential for optimal handling and comfort tailored to the vehicle's purpose.
Spring rate depends on the geometry and material properties of the spring. For a coil spring, the formula for spring rate is: k = (Gd^4) / (8nD^3) where k is the spring rate, G is the shear modulus of the spring material, d is the wire diameter, n is the number of active coils, and D is the mean coil diameter. You can use this formula to estimate the spring rate of a given coil spring, or to design a coil spring with a desired spring rate.
The spring rate for a suspension system can vary widely depending on the vehicle type, its intended use (like sports cars vs. off-road vehicles), and specific design preferences. It typically ranges from around 300 lb/in (pounds per inch) for a softer, more comfortable ride to lb/in or higher for a firmer, sportier setup. Racing or performance vehicles might have even higher spring rates for enhanced handling and responsiveness.
To measure the spring rate of a coil spring, you need a spring tester, which is a device that applies a known force to the spring and measures the resulting displacement. You can then use the formula: k = F / x where k is the spring rate, F is the applied force, and x is the displacement. You can also plot the force-displacement curve of the spring and find the slope, which is equal to the spring rate. Measuring the spring rate is important to verify the accuracy of the calculation and to check for any variations or defects in the spring.
When selecting the best spring rate for your suspension system, there are several factors to consider, such as the weight of your vehicle, the type of suspension, the driving style, and the road conditions. In general, you want to select a spring rate that is able to provide enough support for the vehicle's weight, absorb shocks and vibrations from the road, and maintain an optimal tire contact patch and traction. There is no one-size-fits-all solution for this, as different vehicles and drivers may have different preferences. However, you can use guidelines and formulas to estimate the ideal spring rate for your application.
Adjusting the spring rate of your suspension system can help you fine-tune the performance and handling of your vehicle. You can change the springs for ones with a different spring rate, adjust the preload of the springs, or adjust the damping of the shock absorbers. However, you need to be aware that changing the preload also affects the ride height and suspension travel, and changing the damping does not change the spring rate itself. Finding the optimal setting requires some trial and error, as well as feedback from your driving experience, so it's important to always test your adjustments in a safe and controlled environment and make small and gradual changes.
Adjusting the spring rate involves replacing the springs themselves with ones having a different rate. This process requires selecting springs with the desired stiffness or softness to achieve the preferred handling characteristics. Alternatively, in some advanced suspension systems, the spring rate can be adjusted by using adjustable spring perches or changing the preload on the springs, but this depends on the design of the suspension setup. Consulting with a mechanic or suspension specialist is recommended for proper adjustments
More important than the actual spring rate is the Wheel Rate. The Wheel Rate is the effective "spring" rate between the chassis and the ground. This takes into effect any motion ratio between the wheel and the spring, unless it is 1:1 ala a typical live/solid axle you might find on the back of a truck. For most other suspension, the wheel moves more than the spring. This means the spring must be stiffer to provide the same wheel rate. Wheel Rate can be calculated as WR=SR x MR squared. Where Motion Ratio is the ratio between wheel movement and spring movement. Complicating matters, the tire is a poorly damped spring in series, so tire pressure and construction play a part. Tire pressure adjustments can change the wheel rate and handling
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Are you looking to enhance the aesthetic appeal and handling prowess of your vehicle? Lowering springs not only give your car a sleeker, more aggressive stance but also improve its handling characteristics by lowering its centre of gravity. However, choosing the right lowering springs for your car involves more than just picking the first set you come across. It requires careful consideration of various factors to ensure optimal performance and compatibility. In this guide, we’ll walk you through the key steps to selecting the perfect lowering springs for your car.
Understand Your Goals: Before diving into the world of lowering springs, it’s crucial to define your objectives. Are you primarily interested in enhancing the visual appeal of your car, improving its handling performance, or achieving a balance of both? Understanding your goals will help you narrow down your options and make a more informed decision.
Research Your Vehicle: Every car has its own unique characteristics and requirements when it comes to suspension modifications. Understand your car’s factory suspension setup, including spring rates, ride height, and compatibility with aftermarket parts. This information will serve as a baseline for selecting the appropriate lowering springs.
Consider Drop Height: Lowering springs are available in various drop heights, typically ranging from mild to aggressive. The drop height refers to how much lower the vehicle’s ride height will be after installing the springs. It’s essential to choose a drop height that aligns with your preferences, driving needs and vehicle’s maximum axle load rating. The maximum axle load rating of your car is often displayed on the sticker inside of your driver door. If you still can’t find it, check your manual or drop us a message for assistance.
Quality and Brand Reputation: When it comes to suspension components, quality is paramount. That’s why we’ve partnered with one of the world leaders in suspension components, Eibach. Also, within our online shop are lowering springs from RacingLine who have a rich history of engineering and manufacturing parts for the toughest environments in motorsport.
Compatibility with Other Suspension Components: Lowering springs should be compatible with your car’s existing suspension setup, including shocks and struts. We’d always recommend consulting with one of our support team via or if you’re unsure on what to order for your vehicle.
Seek Professional Installation: Installing lowering springs is a complex process that requires precision and expertise. Professional installation not only ensures safety and reliability but also minimises the risk of potential issues such as improper alignment or suspension damage. Of course, at QTP all our prices include supply and fitting of your performance parts. All orders go through a thorough check by one of our parts specialists to ensure you’re buying the right part for your car.
To wrap things up, choosing the right lowering springs for your car involves thorough research, careful consideration of various factors, and a clear understanding of your goals and preferences. By following these steps and consulting with our parts specialists, you can select the perfect lowering springs that strike the ideal balance between style, performance, and functionality.
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