My 3.2l XJ6 had the self leveling ride suspension on the rear. The dampers needed replacing and I went with standard Bilstein dampers. Assuming that the original springs would be to soft (the car sat a little low) as they get supported by the pressurised self leveling dampers, I bought new rear springs. https://www.ebay.de/itm/Fahrwerksfeder-NEU-LESJÖFORS-4241407-Hinterachse/282986968245?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Unfortunately now the car sits way to high
I need to measure it exactly, but I’d say it’s about two inches two high.
With about 120kg evenly distributed in the boot it looks about right.
Now, I don’t want to keep replacing springs, so I would like to get it right next time. So I am wondering how to measure and compare springs correctly.
- I would guesstimate each spring gets compressed by about 5000N of force.
- I would guesstimate the spring needs to be 1 inch shorter under load to get the car 2 inches lower .
- If those assumptions are correct I would measure spring rate and unloaded length of the two springs I have and find something that will be in between
Any thoughts on this? Especially about my guesstimating…