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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > Suspension | Chassis | Brakes > Bump Stop Issue with Lower Springs?
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      06-03-2018, 03:35 PM   #1
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Bump Stop Issue with Lower Springs?

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I've been reading many threads that mention bump stop changes when installing lowering springs- and my head is spinning. Hoping someone can help me to understand. My car is an F30 335i Xdrive and I'm considering a slight lowering using either Eibach springs (0.8" front/ 0.6" rear) or Dinan springs (0.75" front & rear). Dampers will probably be stock height type.
Many forum comments suggest trimming 1/4" from stock damper. Maybe someone can explain the engineering behind this. If the spring lowers the car by 3/4", wouldn't that reduce the stock damper travel by 3/4"? So wouldn't you want to trim the stock damper by 3/4" (not 1/4") to allow the same travel distance for the damper?
My car would take the Dinan bump stop kit# D193-3011. Does anyone have the OEM bump stop part numbers that are provided in this Dinan kit and/or know the measurements between the bump stops in this Dinan kit and the stock bump stop? Very curious to know if Dinan uses a bump stop that is 1/4" less, or 3/4" less or some other amount? Thanks in advance for your help.
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