Member, P500 Sport, DSC off (>900)
Join Date: Oct 2012
Location: New York/Cairo
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PSS9 stiffness is miserable | Buy new coilovers or buy softer Swift Springs?
My new M5 came with PSS9s installed. They're way too stiff for street driving, and effectively make driving my favorite car miserable. This is magnified by bumpy and pothole ridden NY roads.
I'm considering either buying softer springs from Swift or selling the PSS9s and buying softer coilovers instead(recommendations?).
I spoke to Swift regarding the softer springs matching the valving in the PSS9 shocks and was told that even though they come with really stiff springs, there's a certain range for how soft I can go without messing up the balance of shock valving to spring rates. However because I haven't found the standard PSS9 spring stiffness Swift has been unable to give me an estimate on what springs I could get for a softer ride while maintaining valving balance.
What spring rates would be ideal for a very smooth ride on the E39 M5? Anyone have experience with comfortable coilovers and know what stiffness those springs are?
If I were to buy new coilovers, which ones would provide the best quality ride while still offering adjustability and improved performance? I know softer springs don't help handling as much as stiffer ones but too stiff hurts handling on the street like my current setup, I don't need race car handling, just minimal body roll and a firm but comfortable and smooth ride.
2001 Jet Black ///M5
-BBS LMs 19x8.5, 19x10
-Bilstein PSS9 Coilovers
2003 Imolarot ///M5
2002 Titansilber ///M5