What about helper springs ? are they a good investment? My mate had them on the EVO8 and he swears by them he sais its the best thing after sliced bread
Helper Springs are pretty much useless on a dual perch coilovers such as the Zeta-R...
What a helper springs does is it takes up the slack between the top mount and the springs (if any)...
This are mainly for cars that use old style single perch coilovers and need a short spring in order to lower the car.
The resulting gap are not TUV / MOT legal... and there is a possibility that the springs can unseat itself at full droop (wheel in the air)... therefore you put "helper" springs on to take up the slack in case your car ever get any air time.
Another down side of helper springs are that they are design to fully compress on any weight (they have next to no springs rate)... So say you have a 50mm helper springs that will compress to 20mm, it mean as soon as you have that on your suspension system, you just lost 30mm of damper stroke travel.
This pretty much take out all the good point of a dual perch coilovers such as the Zeta-R... and is one huge leap backward in suspension design.
On a dual perch coilovers, you do not move the springs when you lower the car.
Therefore, no matter what ride height, your damper stroke travel will remain the same and the springs will never be loose... so there is no need for helper springs.
There are some time when you do use helper springs... but they are very limited.
You only have that if you need to have ridiculous amount of travel such as those found on a rally car.
Or you have a stripped out race car with super heavy race springs... therefore you need to use the helper springs to let the damper compress as there are not enough weight on the car to push the piston of the damper down... especially on heavy race springs (>20kg/mm sometime) !!!
That is one thing that had baffle me before because I do not understand why people need helper springs on a dual perch suspension setup other than for the reason stated above... and those generally never apply to any road car suspension.