Problems with e46 330ci HSD Monopro with 7/9 KG springs

Thread in 'Technical Questions' started by Valentin Danev, Oct 16, 2020.

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Shall i increase the dampening so the shock stops the suspension travel before it reaches the end.

  1. Yes

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  2. No

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  3. This is not your problem (please suggest what else it could be)

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  1. Valentin Danev

    Valentin Danev New Member

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    Hi All,

    I have recently purchased a set of used HSD Monopro coil-overs with 7/9 KG springs for my e46 drift project.
    When I first got them the previews owner had them preloaded with 5cm.
    I have followed the guide on the driftworks webpage so my current setup is:
    Preload set to 2-3mm just to stop the spring from moving freely.
    The anti-roll bar eye is set to the same hight as the original suspension.
    Hight set to stock hight. Dampening is set to 8 clicks (bang on in the middle)
    It feels good in 99% of the time but if I hit a pothole or a collapsed drain (deep 5-10cm) I can hear a terrible metal bang. I am not an expert on car suspension but it looks like the suspension goes to its full travel and then hits the limit on the shock. I cannot imagine this is healthy for the shocks. Do you have any idea what I have done wrong?
     
  2. Nite_Shayde

    Nite_Shayde Active Member

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    Diagnosing issues like this over the internet is always a tricky business. Assuming the coilovers have actually been installed properly, I'd look to confirm that the bang really is being caused by the shocks bottoming out. It's definitely a metallic sounding bang? There should be bump stops on each piston rod, so when you do hit the bump stops it shouldn't sound like a "terrible metal bang", unless the bump stops have been removed for some reason.

    What you can do is place zip ties on the piston rods, making sure they are at the very bottom - after a drive, you'll be able to see how far up the zip tie has been pushed, and if it's right at the top under the bump stop, then you'll know they are indeed bottoming. But I'm not sure that's what's happening here.

    Double check everything is installed correctly, all bolts, nuts, locking collars tight, etc etc.

    Also though, I think it would be wise if you did your best to avoid potholes that deep in the first place. You're seriously hitting ones that are 4 inches deep? Not sure you wouldn't hear a terrible metal bang in any other car to be honest if you did that, lol
     

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