I have a set of Ground Controls on my TEG
i've seen the eibach ers helper springs on a image somewhere on the internet...
but i was wondering what they were for....daily driving...autocrossing....
what???
cause if it's gonna help my suspension...then it's an investment i'd take....
what are they? and what is it's purpose? and is it used with the ground control coilover system?

 

Helper springs are for comfort only, their purpose is too keep the main springs from rattling around. It's a common side effect to coilover suspension with short main springs, the helper spring will fill the "empty" space, for a lack of better terms. They're usualy very thin and will compress all the way when there is load on the suspension. The pic below are tender springs off a Tein coilover.


Tender springs is what you'd probably want instead. Basically they're shorter & less stiff than the Main springs. Using these will allow you to have variable spring rates. The lower spring rate (from the tender springs) will provide comfort during daily driving situation. While the stiffer rate will take over once the tender springs are fully compressed and the Main springs take over, such is the case when you're on the racetrack taking a decreasing radius turn...which will compress your outer suspension enough so that the Main (higher) spring rates are the ones being used.

HTH