Quote:
Originally Posted by Orb
One of the best suspension write ups I have ever seen.....awesome details!!
I was looking at the CG plated when I came across this thread. I will defiantly will make my own. They obviously did no testing or calculations.
Question for the poster:
Did you account for the CG OEM spring perch deflection under load. I measured about 10 mm for the OEM spring perch. I suspect this came out a wash or close to it.
As for the rear spring compressing on a curved axis. I did a non linear analysis in Ansys and the spring rate does increase anywhere from 15-40%. This is dependent on spring wire diameter, spring length and stroke position so not a straight forward answer. I resolved the issue with the a sealed articulating spring perch placed between the helper spring and main spring. The soft helper spring works well at taking up translation by deforming as well. This made a very noticeable improvement and ride quality was a night a day difference especially over rough roads.
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Hello,
i am into "constituing" a rear coilover set for my 125i:
- Main spring Eibach 7" Length ; 2,25" ID ; 650 Lb/inch rate ; PN : 0700.225.0650
- Tender Spring Eibach 2,68" Length ; 2,25" ID ; 300 Lb/inch rate ; PN : 0175.225.0300
- HPA Height Adjuster or another good quality one. I appreciate this one because you can fitting a thrust bearing to avoid stress in the spring
https://www.hpashop.com/HPA-E82-E9x-...st-e82-e9x.htm
I have one question:
Does anyone know where i can buying this ball joint coupler "sealed articulating spring perch" in 2,25 Diameter?
TY