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Trimming OEM Bump Stops

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Old Jan 13, 2025 | 10:18 AM
  #1  
160Swift's Avatar
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Trimming OEM Bump Stops

Quick question about trimming OEM bump stops on an FD, been scouring the forum and can't find a definitive answer. Replacing my worn out stock suspension with Koni Sport dampers, Tein H.Tech springs, and all new rubber mounting hardware (a huge thank you to @gracer7-rx7 for the wealth of information you've shared on this setup, and hope you don't mind me using a couple of your images below). The instructions for the Tein springs state I need to trim 0.8" off the bottom of the rear bump stops. Before I hack up my new upper spring mounts, I am hoping to gain a better understanding of where I'm cutting. It seems that the dust boot is molded around the bump stop, and the bottom of the bump stop only extends a couple tenths of an inch below the top of the dust boot:



If I cut 0.8" off the bottom of the bump stop, I would essentially be cutting off the dust boot entirely. Is this correct?


Last edited by 160Swift; Jan 13, 2025 at 01:47 PM.
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Old Jan 13, 2025 | 06:32 PM
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Been a long time since I looked at those but sounds like you're on the right track.
Why not remove those hard bump stops and go with more modern, progressive foam bump stops?

I think I'm the only person to ever screw around with FD bump stops - besides you now.
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Old Jan 14, 2025 | 04:02 PM
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Thank you for the reply & suggestion - I am going to give this some more thought and research bump stop alternatives!
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Old Jan 15, 2025 | 12:20 PM
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Google for threads from Fat Cat Motorsports about bump stops on the Miata. Same problem as the FD.
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