Will H&R Springs work in a NON-SLS M5?

[Crazy Croat]

i know Steve Haygood says it bottoms out but wasnt sure if that was with the SLS still installed or removed. Others have said it worked in non-sls applications ..535i, is..etc.. I removed and sold the SLS off my car and put in Bilstein sports and ST springs. I want springs with a little more bite so I am thinking H&R. The questions is whether is will work and not bottom out on a M5 with the SLS removed??

[Rich Euro M5]

i know Steve Haygood says it bottoms out but wasnt sure if that was with the SLS still installed or removed. Others have said it worked in non-sls applications ..535i, is..etc.. I removed and sold the SLS off my car and put in Bilstein sports and ST springs. I want springs with a little more bite so I am thinking H&R. The questions is whether is will work and not bottom out on a M5 with the SLS removed??

You can't use standard shocks, Bilstein or Koni with the SLS springs. The SLS springs will bottom when used with standard shocks. To install standard springs and shocks requires replacement of pretty much everything in the rear coilover assembly. The highest rate lowering spring out there without going to coilovers is the old RD Sport "Green" lowering springs. These have a high enough rate to require more rebound damping than a Bilstein Sport or HD shock provides. Most ran Koni SA "Yellows" back in the day. The problem today is the Koni Yellow SA is no longer available for the E28. Someone Downunder has a supplier than worked with him and they built up a set from parts. I doubt the US/NA distributor would be willing to do this.

Rich

[Steve Haygood]

In real world use, H&R are weaker in the rear than ST. Stay tuned, I am trying to convince ST to make a stiffer rear spring

[Crazy Croat]

A stiffer ST spring with another 1/2" - 3/4" drop would be great. My friend has Eibach and it looks like he has cement bags in his trunk. I'll wait to hear back from Steve.

[Steve Haygood]

To drop the car, just lower the spring perch adjustment . I'll keep you posted on the ST spring change

[Crazy Croat]

ok.. sorry for the ignorance....how do you go about adjusting it? I never did that before and want to make sure its done right..
Thanks

[Steve Haygood]

Remove the rear shocks from the car. Remove the spring, move the circlip toward the bottom. I strongly advise against going to far or you will be replacing tires more often than necessary. I run mine 1 slot above the middle (using Koni's) and there is no room between the tire and the fender

[Azure]

In real world use, H&R are weaker in the rear than ST. Stay tuned, I am trying to convince ST to make a stiffer rear spring

Serious? I'm pretty happy with the rear ST springs, however as I'd originally suspected, the Bilstein Sports don't dampen the rebound enough for my liking. *sigh*.

Oh well.