I posted this in the Suspension forum first but never got a reply

How does spring length affect ride and or performance of the shock???
if you have two springs one is 8" and the other is 6"(preloaded with a zero rate spring) but both have the same spring rates.
lets say they are both on identical shortened sps koni's and we are using ground control coil overs

what are the advantages/disadvantages of a longer spring

what are the advantages/disadvantages of a shorter spring

ITR relation= I need to choose spring lengths for my koni 3011 that are going on my itr

 

The shorter the spring, the less travel the piston will have......If you put short springs on that were not meant for the specific shocks you will most likely have a shitty ride and noisy at that. When u hit bumps or dips the spring will be loosely bouncing and clapping against the shocks.

In other words.....get spring and shocks that were meant to go together.

 

It's not just spring lenght that's important. You need to know the motion ratio of the suspension and the spring rate. You also need to know the effective travel of the shock and the minimum ride height for it as installed on your car.

The shock was valved for a specific spring rate for a specific car weight and motion ratio. So your spring rate should be determined by that. Then basically you want a spring that is long enough so that the shock will not bottom out at the bottom of normal suspension travel. I suggest that you get on the suspension forum and ask for CRXLee to help you. Since its a Koni product and Lee is a Koni employee he will be best able to give you advice.

regards,
alan