PSS9 stiffness is miserable | Buy new coilovers or buy softer Swift Springs? - BMW M5 Forum and M6 Forums
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post #1 of 9 Old 19th June 2019, 01:37 PM Thread Starter
chopper82p
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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

Mods:
-BBS LMs 19x8.5, 19x10
-Bilstein PSS9 Coilovers

Previous M5s:

2003 Imolarot ///M5
2002 Titansilber ///M5
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post #2 of 9 Old 19th June 2019, 01:41 PM
Jayson
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Why not start by adjusting the damping of the pss9 Tina softer setting?

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2003 LeMans Blue Bmw M5-Stoptech 4 wheel brakes, Eibach sway bars, Bilstein PSS9 coilovers, Dinan Brake ducts, UUC short shifter, UUC trans mounts, Dinan Clutch and flywheel.Sirus Radio, Dinan strut brace
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post #3 of 9 Old 19th June 2019, 07:33 PM
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I would start with emailing ground control to see what their spring rates are for their three tiers of spring rates. I have the ground control "street" springs and I find it compliant, not overly stiff, and somewhat OK on the terrible MI roads here...but I also do not daily drive my car.
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post #4 of 9 Old 22nd June 2019, 10:51 PM
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i got ST coilovers,, very comfortable. If you ever in North Jersey, i'll give you a ride.
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post #5 of 9 Old 24th June 2019, 08:09 PM
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I had the non-adjustable PSS coilovers on my M5. Switched to KWV3 and the improvement was huge. It still rides firm, but even with the stock settings the car is very compliant for being so low.

I would 100% do my KWV3 + G.A.S. monoball thrust arms. Its SO good now, I absolutely love it. Roads in Sacramento aren't very good either, so I feel your pain.
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post #6 of 9 Old 25th June 2019, 02:04 AM
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Interested in selling the PSS9's? I have Dinan springs with Koni adjustable shocks I can offer up.

Chris

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post #7 of 9 Old 25th June 2019, 11:50 PM Thread Starter
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Quote:
Originally Posted by ChrisSKillaZ View Post
Interested in selling the PSS9's? I have Dinan springs with Koni adjustable shocks I can offer up.

Chris
Sent you a PM, I may be interested.

2001 Jet Black ///M5

Mods:
-BBS LMs 19x8.5, 19x10
-Bilstein PSS9 Coilovers

Previous M5s:

2003 Imolarot ///M5
2002 Titansilber ///M5
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post #8 of 9 Old 27th June 2019, 02:12 PM
Obioban
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post #9 of 9 Old 27th June 2019, 03:57 PM
Edgy36-39
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Quote:
Why not start by adjusting the damping of the pss9 Tina softer setting?
Super obvious, but this was my first thought as well. You have set the dampening at it's softest, right? I've got PSS9s, and have them set for everyday driving. And like Obioban is asking, height could be issue too. When I bought car it was pretty low, I brought up to near stock height after purchase.

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Last edited by Edgy36-39; 27th June 2019 at 03:58 PM.
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