Ground control coilover kit


lutherking92

lutherking92

RiceCrewPécs member
Joined
Jan 16, 2011
Messages
147
All right guys, I can't take it anymore. It's killing me, that I don't really know what is the weak point of the setup. I thought ek4 shocks revalved and strengthened to koni medium will be ok. GC sent me 8,4 kg/mm front and 6,4 rear. Now the ride is so bumpy I can't even use it in the city, or on any road that is worse than highway quality. What's your guess? Some said the springs are too stiff, in my opinion the shocks are too stiff. Btw the rear is much milder, maybe even good for a daily. Worth a shot going with koni yellows? I never read that this setup (koni + gc) was bad. So if the stiffness is the same, then how come the ride is so much bad? (sometimes I feel like in a lowrider with bouncing front end)
 
so really want damper settings on them.thanks for the heads up was gonna buy also!!
seems the right spring rates EK=F860/R820..8kg=448 and 6kg=336 lb
OR maybee try less on front..
 
Well, the box says 450-350 so it's around 8,4 and 6,4. At GC and some other forums I got that info that the shocks are weak for it, and with the konis it will be unbelievably better. So nothing else to do, I wanted konis anyway, but not this soon :D
 
How low have you lower the car's ride height?
You may be hitting the bump stop?
 
No. First I was thinking the same, so I put the car higher, but it was still as bumpy as before. So until I get the konis, I will lower it back. Btw I have no idea about the amount of lowering, since I'm doing it to be symmetrical and nice :)
Edit: Don't get mislead, the shocks were softer than koni yellow on medium. :)
 
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sounds like your dampers are fooked! if its bouncing like mad then they aren't doing there job!
 
Dampers are revalved and I'd say they are working good. But can't take on the hard springs. They are for a fairly stronger ones than stock. So as a final solution I'll go with konis, and will write here the result. Btw, if some of you with 8 kg/mm - 450 lbs/in or higher could write his feelings, that would be great. Like how is on shitty road, and what kind of dampers are you using?
 
Just installed konis a few hours ago. Still ****. Front set to stiffest, and bounces like hell. The spring is just too stiff even for konis, you can feel it bounces several times over bumps. Any ideas? Buying 2 more springs wouldn't be so cheap, and it's time etc. But it's more likely that there will be no other solution?
 
try swaping the springs if poss back to front<stiffer on back>see the usa do this and would even the rates up strange it might seem, as it would tune the bumps ect to each other.at least it would give you damping availability on the adjustment.

they marked f/r? dont think so as springs are off the shelf to your order and eibach or GC numbers?
whats full part numbers on the srings? PICs
"" " "" ..................."""""" kit?
 
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I'll post pics later, since my mate took them and didn't send me yet. They are 450-350 as mentioned before. No mark for f-r but the shorter sleeve is for the front as I know, and for feel it is stiffer, too. But I starting to figure out the problem, and I don't really know if I should write it, cause it's so annoying, that I missed a so clear point. The stock bumpstop (that big pink-orange foam) is still on, and on koni you need to cut IIRC.
 
450lbs is still within the range of adjustment on Koni yellows, they can go up to 550lbs reportedly, though this does vary depending on your car. Are you running heavy wheels?

I would say you've probably just picked rates too high for your circumstances. Replacement springs are cheap from GC, try some lower rates, perhaps 350/250. If you have some heavy ass wheels, junk those in favour of some small lightweight ones with a bigger sidewall tyre.

IIRC you need to get rid of the dustboots on the Konis and/or trim the bump stops.
 
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Kozy said:
450lbs is still within the range of adjustment on Koni yellows, they can go up to 550lbs reportedly, though this does vary depending on your car. Are you running heavy wheels?

I would say you've probably just picked rates too high for your circumstances. Replacement springs are cheap from GC, try some lower rates, perhaps 350/250. If you have some heavy ass wheels, junk those in favour of some small lightweight ones with a bigger sidewall tyre.

IIRC you need to get rid of the dustboots on the Konis and/or trim the bump stops.
Click to expand...
I was thinking the same, but as I was watching how the car behaves, it's pretty much obvious, that the springs still hold the car too much, because over bumps you feel that bouncy stuff, when the spring compress, then push up the car, the weight fells, and compress again and so on. I hope you understand what I try to say. I'm thinking that the problem is the bumpstop, and I was just plain silly to forget that. Yeah maybe it is too stiff even after I get it straight, but then I just order two other springs. I'm running on heavy wheels, and the ventus rs-2s have strong sidewall, but the main problem is that there's no damping (as far as i "feel")
 
Yes if you re bouncing a lot like that then it sounds like you are underdamped, though it is a little strange as the rates are within what Koni's are regarded to handle, though obviously approaching the top of their adjustment range. The car should bounce once and settle, more than that is too little damping, and if it is slow to return from the initial bounce then there is too much damping.

Order some 250s for the rear, swap your 350s to the front and see how that goes. Get rid of those heavy wheels too, heavy wheels are the work of the devil and they have absolutely no positives, but a lot of downsides.
 
That is what my plan B is. First I raise it, to see if the stock big bumpstop is the problem. After that I make that cut seen in the GC manual. If still ****, I order 250s and change the front and rear sets. And also planning to buy other wheels, but no money atm. I don't understand clearly the effect of overdamping, could you try and tell me some other way? :)
 
Over damping is where the spring doesn't exert enough force to return the damper to it's static position, easily diagnosed if you bounce one corner it will go down but come back very very slowly. Over a bumpy road, this ends up jacking the car down onto the bump stops as the suspension doesn't have time to return up before the next bump.

Gives you a real shitty ride and sketchy handling, I can tell you from experience. :nono:
 
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All right, one more question :)
Bump stops
Here you can see in the pics that the bump stops are sometimes on the bottom of the rod, sometimes on that spot which is slightly larger than the rod. Does it matter?
 
I don't think so but can't say for certain. I think they are supposed to be on the larger spot though.
 
All right I finally figured out a few days ago what was the problem. You won't believe it. The dust boot is made of some kind of metal or I don't know, but it sits on the coilover sleeve's perch and keeps the shocks from working. I feel so stupid right now. Hope today I can get them out and fix it.
 
All right, suspension is done. Without the dustboots and with the cut bump stops, it is just wonderful. If you are thinking of getting a GC set with 450-350 spring rates, I can only tell you to do it. Very very nice handling, and even on our shitty roads it's pretty comfortable.
 
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