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  1. #1
    Yohan87's Avatar
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    4motion - Rear Coilovers Bottoming Out?

    Afternoon Chaps,

    I drive a VW Bora 4motion however for all intents and purposes, it's pretty much an 8L S3.

    I have H&R V1 Twin-Tube Coilies fitted to the car and recently the rear end has developed a strange noise. When going over bumps in the road, it sounds like the rear left shock is bottoming out. Particularly bad when I have passengers in the back seats and both shocks are doing it.

    I have the adjuster cups set to the highest setting they can go and the car is running on 17" alloys with 235/45 tyres.

    It might be worth mentioning that I have a 22mm Neuspeed Rear ARB.

    The coilovers are only 1 year old.

    Other times I get creaking noises but it is the harsh thud noise that sounds like the shock travelling its full length that concerns me.

    There doesn't seem to be too much to go wrong at the back end suspension wise so I'm wondering what it could be?

    Hopefully I'll get a chance next weekend to have a closer look.

    Thanks in advance.

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  3. #2
    Nick090884's Avatar
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    Hi ya dude i had the same issue until i changed my rear trail arm bushes, a nasty feeling on the smallest of imperfections in the road. It got to the point wear id lift myself out the seat , not nice sure its the shocks or coils ?

  4. #3
    Yohan87's Avatar
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    Interesting.

    My rear upper tie arms are Forge adjustable ones. The lower tie arms are OEM however they are fitted with SuperPro polybushes.

    It's a horrible feeling and sounds like the shock is going to burst :S

  5. #4
    Nick090884's Avatar
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    Quote Originally Posted by Yohan87 View Post
    Interesting.

    My rear upper tie arms are Forge adjustable ones. The lower tie arms are OEM however they are fitted with SuperPro polybushes.

    It's a horrible feeling and sounds like the shock is going to burst :S
    Hi ya the rear axle bushes (trail arm bushes) was what had gone in mine. if yours are polybushes id check them as they dont last that long from what ive gathered on here, they squeak a bit as well. id be shocked if it was your coils or shocks if there new ,they tend to go for quiet a long time. my car felt like it was on bear metal going over pot hole changes in tarmac etc.... they were really bad if loaded at the rear.

    Let us know how you get on.

  6. #5
    Yohan87's Avatar
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    Thanks Nick, I'll get it up on the ramps this weekend and have a look.

  7. #6
    Yohan87's Avatar
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    Hi Nick, just wanted to make sure we're on the same page.

    Is it part number 5 (bottom left) in this diagram you are referring to?


  8. #7
    Yohan87's Avatar
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    Had a look today and I can see no reason for the squeaking/banging noise over speed bumps or when the car is fully loaded.

    Ordered 4x new trailing arm joints (number 4 in the diagram above) and going to fit them and re-grease the other ones at the same time.

    Maybe the actual subframe bushes are at fault?

  9. #8
    Dani_B19's Avatar
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    Or mayb the coilover itself? Had same issue at front with kw v2's, turned out the damepener was shagged, £250 later all is good.
    Driving the most secretive S3 on ASN

  10. #9
    Yohan87's Avatar
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    *Update*



    I put the car in to a local motorsport garage and they said the rear springs are binding even when the car is unloaded, so when the car is loaded the springs are fully compressed and hence the severe banging noise from the damper. There is evidence where the spring faces have been rubbing against each other.



    What are my options and has anybody else ever experienced this?



    Would Mk4 R32 rear springs do the trick?

  11. #10
    Yohan87's Avatar
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    Another update to this.

    Got some R32 rear springs fitted and all the bushes checked over at the rear but I'm still getting banging/knocking noises now, albeit a different type of noise. Even with forward/back motion such as sudden braking at times. Haven't tried the car fully loaded.

    Next step is disconnect the rear arb and see what noises change.

  12. #11
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    change your drop links mate, all four of them

  13. #12
    Yohan87's Avatar
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    The noise is only coming from the rear though, aren't there only 2 at the rear?

  14. #13
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    yep only 2. but if you havent changed them i recommend all four and cheap and quick to do.
    just done mine and the difference is no more knocking front or rear.

 

 

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