09-09-2022, 05:02 PM | #1 |
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Rear shock valving calculations and moment arm
I've been researching aftermarket suspensions, that means reading about flat ride, how the rear spring need to be much stiffer than the fronts, using Andrew spreadsheet...etc.
Here is my question, if I pick a 9k spring in the back and get shocks re-valved for that spring would it simply be for a 9k spring or would it be for a weaker spring because the location of the shock is further away from the pivot point than the spring itself? I hope my question makes sense. |
09-09-2022, 11:09 PM | #2 |
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Drives: 328d Wagon, M2 Comp, i4 eD35
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You would need to translate the natural spring rate (9k) into the wheel spring rate since it's motion ratio is so different. Then you'd need to do the same for the damper forces since the damper is also inboard of the knuckle. Basically, get the damper and spring forces on the same "location."
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09-09-2022, 11:14 PM | #3 | |
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09-09-2022, 11:18 PM | #4 |
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I really hope you can make it happen! My wagon still puts more of a smile on my face than my M2C (now on Ohlins R&T for testing) and a big part of that is due to how versatile and refined the FCM suspension on it is.
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-328d Wagon Build Log (with helpful reference links)
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09-10-2022, 11:51 AM | #5 |
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+1 for Shaikh's work if you can save up a little longer and plan to keep your f30 long enough to justify the price. I'm extremely satisfied with my custom Fcm suspension and I doubt any of the aftermarket options can even hold a candle to it. Combined with the other mods I've added like lsd and engine tune/bolt ons, the car is an absolute blast and I don't see myself ever getting rid of it even if I get another car.
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