By combining Eibach Main, Tender and/or Helper springs, the suspension engineer can create the perfect combination of spring rates for the ultimate suspension set-up. With our extensive range of motorsport spring sizes and rates – over 1,400 different options – our ERS system is unsurpassed in performance and flexibility.
Suspension tuning is a precise balance. On one hand, the spring system should be soft enough to absorb track irregularities assuring maximum adhesion, while on the other hand the spring system must be firm enough to reduce the body roll, squat, and dive of the vehicle during cornering, acceleration and braking. For optimum balance, a dual-spring system can be used.
The Eibach Main and Tender Spring concept provides a softer initial rate when both springs are compressed together, then delivers the desired firmer final rate once the tender spring closes completely. The Main Spring has a linear-rate characteristic and determines the final rate of the system. The Tender Springs are available in linear or progressive-rate and determine the initial rate of the spring system.
A Helper Spring is used to prevent the Main Spring from becoming loose in the spring seat when the suspension is unloaded or at full droop. The Helper Spring, unlike the Tender Spring, has very little spring rate, and therefore has no effect on the suspension characteristics of the vehicle. Up to 6” (150mm) of spring-to-perch gap can be covered with the use of a Helper Spring.
Spring Rate is defined as the amount of force required to move the spring a given distance, which means a 100lb/in spring will travel 1 inch for every 100lb of force exerted on the spring.
In a multi-spring system, the misconception is that the first spring will carry the entire load before the second spring begins to compress. This is untrue. In the example below, two 100lb/in springs are stacked. Each spring will still move one inch for every 100lb of force. With these factors, the combined rate of a multi-spring system can be determined.
K1=Rate of Secondary Spring
K2=Rate of Primary Spring
Kcombined=Combined Rate of System
This diagram shows a single 10-inch spring at 100 lb/in over its entire stroke range.
This graph shows a dual-rate system using a 10″ 100lb/in spring stacked on a 16″ 300lb/in spring. This demonstrates the transition that occurs when the 10″ 100lb/in spring reaches its block height. This allows for a softer initial rate for smoothness on smaller bumps with a stronger final rate for big jumps or full compression scenarios.
From the racetrack to the road – our performance suspension products for your vehicle
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