ERS Wizard

To help you determine the Main and Tender combination that works best for your situation, Eibach has developed a computer program called the ERS Wizard. Because every chassis / suspension / driver combination is unique, we suggest that you utilize the ERS Wizard to fully understand the dynamics of the double spring combination before you go testing.

The ERS Wizard is undergoing a major software upgrade, but will be available here shortly. If you want to be notified when the new ERS Wizard is ready complete this form to be added to our notification list.

Below, we have listed the formulas for determining the initial and final rate, as well as the transition point between the two. These are the basic formulas behind the ERS Wizard.

 

The following formula is used to determine the initial spring rate:

Ci
CM
CT

Initial Spring Rate
Spring Rate of Main
Spring Rate of Tender Spring

Ci =

CM x CT
CM + CT

The final spring rate (effective after the tender spring is closed) is simply the rate of the active Main spring.

 

The following formula is used to determine the transition point  
between the initial rate and the final rate:

TP
Ci
(Fc)t

Translation Point
Initial Rate of Main/Tender Spring Combination
Block Load of Tender Spring - See Application List

TP =

(Fc) t

(Ci)

Please note: the main/progressive tender spring combination has various rates and transition points and as a result the respective formulas required to determine the rates and transition points are more complex. Please refer to the ERS Wizard for these calculations.