Suspension Mathematics

Follow the instructions in the Comments column.

Data Front Rear Comment
Wheel spheres cm3
bar
mm bore
cm3
bar
mm bore
Start by specifying the volume and pressure of the various spheres in the system. Select your car*

for the originally fitted spheres or enter the values manually.

Central spheres cm3
bar
mm bore
cm3
bar
mm bore
In the case of the Hydractive XM/Xantia, specify the volume and pressure of the central spheres as well. In the case of other models, enter zeroes into the fields.
Masses kg
= 65% of total
kg
= 35% of total
If you want to calculate with a different weight distribution or load, modify the values accordingly.
Strut piston size mm bore
mm stroke
mm bore
mm stroke
 
Roll bar diameter mm mm  
* H=Hydractive; NH=non-Hydractive, A=Activa
We have done with the input, the rest will be calculated automatically if you press the button.
Volume ratio % % Soft/hard ratio of sphere volumes
Spring constant ratio % % Soft/hard ratio of equivalent spring constants
Eigen frequency Soft: Hz*
Hard: Hz*
Ratio: %*
Soft: Hz*
Hard: Hz*
Ratio: %*
Soft/hard ratio of eigen frequencies
* NaN=overflow or divide-by-zero, re-check the input data

Paul Smulders