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Discussion Starter #1
Hello!

Because of a damaged original shock I've replaced both rear shocks for Bilstein B4 but kept the original Springs.

First thing I noticed was that the rear of the car is almost 1/2 inch higher and the 2nd thing is that I now have a noticeable floatyness in the rear; as if it's seated on an air cushion. On the highway it feels like there is a constant side wind present... it's just wobbly.

I read that the B4 shocks are stiff enough for the V6 so what can be the cause? Do I have worn springs too? I have a set of Eibach prokit springs I want to install but will this definitely eliminate the floatyness and give me the stiffness back or do I need stiffer shocks like the B6??
 

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If it has the same springs as previous then the height should be the same as before. Somethings not right!

I had my rear shocks fail, probably in the same manner as yours, this is a common problem. The cup rusted and collapsed so that the remains of the shock cup ate through my rear tyre. I didn't fancy having a go at fixing this myself so took it to the garage. The repair was expensive as a lot more than just 2 shock absorbers were needed to make this right and every component was difficult to remove. Speak to your garage and ask what bits they actually replaced because although they may have been trying to save you a few quid the best bet is to just replace everything from the arms to the tyres as it will all be well past it's best. Take it somewhere you trust but don't expect a cheap fix.

P.S> I have the prokit springs and they put my car nicely low with no problems. I've always had standard shocks and I think my new rears were the cheapest munroes.
 

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Ride height should be the same, did you replace the top mounts? If so have you used the right ones?

Did you have re-allignment done, poor allignment could explain the wobbly feel. Your rear transverse arms probably have knacked bushes- i would replace them at the time.
 

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Discussion Starter #4
Hi!

Yes, I had a rotten cup and it blew my rear tire in the process. Actually only the shocks and the tires were changed due to some hurry in the repair (I needed the car for my work); also two lower wishbone bushings were replaced (the 40.2mm ones) due to impact damage for removing the lower pretty seized bolt.
So in the hurry nothing else was replaced but I had no problems with floatyness before the repair so I guess the bushings of the transverse arms are still tight.

The alignment was checked but was well within margin so they didn't change anything. Maybe the tyres are crap though. I'll first change the springs for the Eibachs and if that doesn't eliminate the wobbly feel, I'll switch tyres with the front to see if that makes any difference.


I also forgot to mention that when I brake the back is lifted an inch or something and falls back down to normal ride height; was not doing this with the original shocks.
Also, when I push the rear with my hands, the first inch goes quite easy and then it gets stiffer. This let me suspect the springs are not up to the job or the shocks / original spring combi is not working (soft shock / stiff spring issue?)
 

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Discussion Starter #6
Sounds like the top nut on the strut hasn't been tightened correctly to the top mount.
The nuts are tightened firmly but I don't know how much torque (Nm) it has to be tighten. I don't see them moving while depressing the boot with my weight.

I have replaced both original springs today for the Eibach ones. The stiffness has certainly come back for the most part, the floatyness when cornering and with speedbumps are gone.
Weird thing is that the Eibach Prokit springs are lowering springs (up to 30mm) but the original spring is almost the same height?! Hell, the Eibach even seems a tiny bit higher! Weird!?! Didn't know the V6 was already lowered out of the factory?

(left original, right Eibach).


Now I have yet to do the front with new Koni shocks and Eibach springs and I think the car will have even less roll... maybe I even consider getting an Eibach ARB for even less roll. :thumbu p:
 

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I noticed the same thing, the Eibachs I fitted to the rear of my 156 were taller than the sportpack springs that came off it, but the ride height is the same..
 

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The free length of a spring is only one component of the static ride height. You also need to compare wire diameter and number of coils. In this case the black spring has fewer coils, so for the same free length and wire diameter will be significantly stiffer than the red spring. However the red spring may have a larger wire diameter.
 

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Discussion Starter #9
The free length of a spring is only one component of the static ride height. You also need to compare wire diameter and number of coils. In this case the black spring has fewer coils, so for the same free length and wire diameter will be significantly stiffer than the red spring. However the red spring may have a larger wire diameter.
The black spring was noticably stiffer when I tested it with hands; the red spring is a bit softer. I think in my case the stiff spring didn't work out with the B4 shock; the shock couldn't dampen the spring fast enough so it's gets floaty.
The car feels far better controlled now with the Eibachs installed, for instance, on the highway it felt like there was a constant side wind and I didn't go above 140km/h anymore because it felt unpleasant.
 

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Yes I believe the 3.2 sits lower than other models as standard.
 

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Discussion Starter #11
Within a day of installing the Eibach springs, the stifness is back with a vegeance; the car feels very stable and controlled again and when I push down the rear suspension it only travels no more than an inch and it feels just stiff... so it's OK now! ?

As for the front suspension, I tried to replace but that lower shock bolt is seized and I've not the right tools to get it out; the other side will be seized too I guess. I think I'll let it done by a specialist instead.
 

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Front shock bolt is always seized, they usually require a press to get them out, and a new bolt. Make sure they grease the bottom of the shocks, and the bolt with waterproof grease. I changed a set of shocks in about 30 minutes a side as I had greased them when I put them in. The original job a year ago took an afternoon a side and huge amounts of swearing.

Eibach + b4 is a good combo. Get it properly aligned, at both ends.
 
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