I've got Xida Clubsports (love them) and I'm trying to figure out how give the rear helper springs some travel. They are all but FULLY compressed at full droop. My car is a stock weight NB on 6" front and 6" rear 550/350 springs. I shot the linked video today, it shows that I have no helper spring travel:
What needs to change to give them some travel? Long/shorter spring? Softer/harder rate? I can lower the perch a bit (rear ride height is ~4.125 at the pinch weld), but what else can I do? I think the helpers are 150 lb/in. Perhaps this rate is too close to the main spring rate of 350 lb/in? The fronts have travel available at droop...
helper springs will always be compressed until in droop, and even them IIRC, emilio has said depending on your car wieght/height they might always. This is not a bad thing and what they are designed to do...keep the main spring seated in droop.
sounds like your car might just be really low? 4.125" sounds low. Had you had tender springs, then you'd expect them to stay decompressed more often then not, as they share the weight of the car and work a bit differently.
Fix you video!!!! you copy and pasted a truncated link.
one last thing, are you checking full droop with both rear tires off the ground? If not, your sway bar is a limiting factor anyways, but getting both tires off will be a better representation of the rear being unloaded.
According emilio's description, they are supposed control wheel travel when the wheel is under lighter load. They are not supposed to be compressed at full droop. They are 150 lb/in springs, so they are stiff enough to "work."
However, great point about both wheels off the ground. I need to double check that as I was lifting one side of the car at a time. However, in the video you can see that they never un-bind.
Also, the front helpers have a lot of travel available (they un-bind even when lifting one side of the car).
Get the car lower (it sure didn't look low yesterday but I'm an NA guy), corner harder, go over curbing:
If you put the car down 2" more, the spring will have more room to work.
I thought the car drove fine and you shouldn't be worried about this stuff. Get it on the track, then use the suspension cam...just drive the thing. It handles bumps awesomely (better than my cars), its comfortable, what's the problem?
As a matter of principle, though...if he jacks the rear of the car up by the diff, both rear wheels at full droop, and the helpers are still fully compressed...what's the advantage over spacers?
the helpers are still eating up 150 lbs of weight before the 350lb springs even start to compress, so spacers wouldn't be exactly the same....but no you gotta point there if spacers alone would suffice.