Divorced rear coilover help

[Guarded 5oh]

Before I get burned at the stake if used the search bar as well as Google and I haven’t really found any information that’s helpful in my case. With that being said……..

17 Mustang GT Premium car. I bought a set of ISC Coilovers. Install was fine wheel fitment all that jazz is fine. On my passenger rear, it doesn’t matter how far I raise the spring the car doesn’t go up past a certain point. I’m not trying to give the car a lift, just a more aggressive lowered stance. Car has never been in a wreck and all suspension pieces ie. hard parts and soft(bushings) are in good shape. Pre-load was set to 5mm and the shock adjusted accordingly.

Any ideas to why the car won’t raise on this one side would be extremely helpful. Thanks in advance!

PS. The height difference is half to three quarters of an inch.

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[SheepDog]

Did you loosen or remove control arm bolts to get the coil overs in? If so, maybe you torqued the control arm bolts while in droop, and it is pre-loading or preventing the car on the other side from sitting at normal height. Meaning maybe the problem is on the drivers side

 

[kz]

If you have a divorced spring, what's your spring setup ? Did you verify spring rates are the same ?
Otherwise like SheepDog has mentioned above, one of the bushings may be preloaded at ride height.

 

[Geodudes550]

My springs went to marriage counseling so they wouldn’t get divorced. Y’know, for the kids.

 

[mavisky]

Is a swaybar endlink getting bound up somewhere weird or something possibly?

 

[Guarded 5oh]

Did you loosen or remove control arm bolts to get the coil overs in? If so, maybe you torqued the control arm bolts while in droop, and it is pre-loading or preventing the car on the other side from sitting at normal height. Meaning maybe the problem is on the drivers side

I honestly can’t remember if i did or not. It’s been some time I’ve been fighting this now but you gave me a great idea. I’ll re-do the rear this weekend.

 

[Guarded 5oh]

Is a swaybar endlink getting bound up somewhere weird or something possibly?

I thought that too at first. I checked and checked again. They’re good.

 

[Guarded 5oh]

My springs went to marriage counseling so they wouldn’t get divorced. Y’know, for the kids.

Definitely the kids.

 

[Guarded 5oh]

If you have a divorced spring, what's your spring setup ? Did you verify spring rates are the same ?
Otherwise like SheepDog has mentioned above, one of the bushings may be preloaded at ride height.

Spring setup is from manufacturer. I have no real way to test equal spring rate unfortunately. Kinda left that in their hands to do it right. I’m going to redo and see if the aforementioned above is the case. It’s the only thing at this point that makes real sense.

 

[mavisky]

Spring setup is from manufacturer. I have no real way to test equal spring rate unfortunately. Kinda left that in their hands to do it right. I’m going to redo and see if the aforementioned above is the case. It’s the only thing at this point that makes real sense.

Do the springs not have numbers on them identifying what they are? I know my Eibach springs have a part number on them that specifies the size and spring rate. For instance if you look at the rears on the right side of this image you can see they have a part number of 0600.225.0900 which translates to a 6" long, 2.25" diameter, 900lb/in spring.

 

[kz]

Spring setup is from manufacturer. I have no real way to test equal spring rate unfortunately. Kinda left that in their hands to do it right. I’m going to redo and see if the aforementioned above is the case. It’s the only thing at this point that makes real sense.

Short of some serious easily spottable issue, the options are bushings preloaded at ride height, different spring rates or one of the dampers is very stiff in compression for some reason (or even stuck) and generates additional false spring rate.

 

[Guarded 5oh]

Do the springs not have numbers on them identifying what they are? I know my Eibach springs have a part number on them that specifies the size and spring rate. For instance if you look at the rears on the right side of this image you can see they have a part number of 0600.225.0900 which translates to a 6" long, 2.25" diameter, 900lb/in spring.

It isn’t written on the spring itself but doing a little digging, fronts are 12k and rears are 14k.

 

[Guarded 5oh]

Short of some serious easily spottable issue, the options are bushings preloaded at ride height, different spring rates or one of the dampers is very stiff in compression for some reason (or even stuck) and generates additional false spring rate.

Now when you say bushings pre-loaded at ride height, are you saying the ride height any other than where the car is lowered to or are you saying they’re preloaded to where the car is now? My apologies for not understand clearly.

 

[mavisky]

It isn’t written on the spring itself but doing a little digging, fronts are 12k and rears are 14k.

Well that is what they're "supposed to be", but without any writing on the spring itself I don't know how you'd definitively confirm what you have at what corner.

 

[kz]

Now when you say bushings pre-loaded at ride height, are you saying the ride height any other than where the car is lowered to or are you saying they’re preloaded to where the car is now? My apologies for not understand clearly.

Any of the suspension components joints that has a bushing needs to be tightened at the right (current one) - otherwise you have a rubber / elastomer component being twisted also adding false spring rate and holding the car up. I honestly doubt that this would cause that much ride height difference but it's a possibility.

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