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Knocking sound over uneven surfaces

stannie203
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Knocking sound over uneven surfaces

Post by stannie203 » Fri Mar 24, 2023 4:44 pm

john-e89 wrote: Fri Mar 24, 2023 11:21 am
flybobbie wrote: Fri Mar 24, 2023 8:44 am All i can say about bushes is that my car is 13 years old and 98k miles, bushes haven't worn.
Mine is on 118k, I guess they have to start at some point. Probably should have mentioned mine started shortly after fitting KWV coil overs which may well have flushed out a wearing bush due to the higher poundage springs.
I'm only on 75k miles :(

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Knocking sound over uneven surfaces

Post by B21 » Fri Mar 24, 2023 5:12 pm

My drop link bushes were gone at 55k miles :thumbsup:
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Jey
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Knocking sound over uneven surfaces

Post by Jey » Wed Mar 29, 2023 9:21 am

so, one question - have you checked fully with the roof down, you say hard to hear, it might be that it isn't there when the roof is down. I had the same issue when the roof was up, but not down and drove me insane. almost gone now with one application of tape on the central spike on the roof top. i will be applying a second piece of tape this weekend to hopefully eliminate it completely. It was the spike hitting the rear deck over bumps and making a loud clonk, now its a quieter and duller clonk, and hopefully gone soon as i said.

Think i posted about it on here a while ago, however search spike and or peg and you'll get lots of posts on this issue.
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stannie203
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Knocking sound over uneven surfaces

Post by stannie203 » Wed Mar 29, 2023 9:26 am

Hi Jey, thanks for your input.

This sounds an interesting angle. Yeah when I have the windows down I can't really hear anything from 'the outside' (unlike when the rear passenger spring went, which sounded louder with the windows down).

And with the roof down - the weather hasn't been great here, but drove with the roof down the other day - I'm pretty sure I couldn't hear the noise again. I half wondered whether the extra 90kg folded into the boot was dampening the noise, or the weight was stopping whatever was clunking from clunking.

No idea what or where the spike/peg is so I'll give the forum a search for that.

I really want to avoid sending it into a garage for inspection in case numerous 'faults' get made up!


Jey wrote: Wed Mar 29, 2023 9:21 am so, one question - have you checked fully with the roof down, you say hard to hear, it might be that it isn't there when the roof is down. I had the same issue when the roof was up, but not down and drove me insane. almost gone now with one application of tape on the central spike on the roof top. i will be applying a second piece of tape this weekend to hopefully eliminate it completely. It was the spike hitting the rear deck over bumps and making a loud clonk, now its a quieter and duller clonk, and hopefully gone soon as i said.

Think i posted about it on here a while ago, however search spike and or peg and you'll get lots of posts on this issue.

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Knocking sound over uneven surfaces

Post by stannie203 » Wed Mar 29, 2023 9:41 am

Is it these two parts you're referring to?

I have a feeling the clunking I'm hearing is coming from lower down and further back - although hard to pinpoint sounds!

I'll still give this a wrap of tape if it's the right area as there's quite a few annoying creaks. The plastic cover on the passenger roll bar above the seat being one!
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Knocking sound over uneven surfaces

Post by Jey » Wed Mar 29, 2023 11:36 am

Hi, yes this is the part I'm referring to. Ive put one layer of electrical tape across covering both sides (the angled sides only - V) and this improved, I'm adding another layer at the weekend and hopefully this will resolve the problem. Worthwhile using gumipflege on the rubbers too or similar to refresh them - perished rubbers wont help..
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Knocking sound over uneven surfaces

Post by stannie203 » Wed Mar 29, 2023 11:42 am

Cool, I'll give that a go and the take it for a drive.

I have a feeling my issue could be slightly different (a car nerd at work reckons it's the top mount where the suspension fastens to the car).

However, there's no harm fixing other creaks / creaks before they become creaks!

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Knocking sound over uneven surfaces

Post by stannie203 » Wed Mar 29, 2023 1:14 pm

So, I've wrapped the 'spike' with a bit of tape and had a fettle elsewhere.

I was trying to use my camera to see what was going on inside the wheel arches. Then thought, how come I can do this easily on the passenger side, but not on the driver side. (rear)

Turns out, crudely using a tape measure, there's a 1in difference between the wheel arch to the inner edge of the tyre rim. It's 4.5in on the passenger side where I had a new spring fitted the other week, and 3.5in on the driver side (where the mechanic said he could see a spring had been fitted 'recently' - before I bought the car).

Looks like this is going to be the root of the knocking noise - any guesses as to what will cause this drop in height - before I send it packing to the local garage?!

Edited to add these questions:
- Could it be the new spring fitted a couple of weeks ago is a different length to the existing on the driver rear?
- Or that the previously fitted spring (pre my ownership) is the wrong spring size, and the new passenger rear is correct?
- Would this cause a knocking noise?!
Either way, this knocking sound on uneven roads has occurred since the new spring was put in.
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Knocking sound over uneven surfaces

Post by B21 » Wed Mar 29, 2023 3:42 pm

Wrong spring in the damper won’t be good..looks like you have an MSport spring one side and non MSport other side ..or damper body..or broken spring ..

Others have had issues with incorrectly supplied springs causing much confusion
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Knocking sound over uneven surfaces

Post by john-e89 » Wed Mar 29, 2023 5:46 pm

B21 wrote: Wed Mar 29, 2023 3:42 pm Wrong spring in the damper won’t be good..looks like you have an MSport spring one side and non MSport other side ..or damper body..or broken spring ..

Others have had issues with incorrectly supplied springs causing much confusion
There's only 10mm difference between M sport and standard height springs though right...?
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Knocking sound over uneven surfaces

Post by B21 » Wed Mar 29, 2023 6:07 pm

john-e89 wrote: Wed Mar 29, 2023 5:46 pm
B21 wrote: Wed Mar 29, 2023 3:42 pm Wrong spring in the damper won’t be good..looks like you have an MSport spring one side and non MSport other side ..or damper body..or broken spring ..

Others have had issues with incorrectly supplied springs causing much confusion
There's only 10mm difference between M sport and standard height springs though right...?
Correct ..however the dampers are also different between MSport and ‘normal’..

One member here had a MSport spring inadvertently supplied instead of a stock ride height spring and the effect was very obvious visually and ride height wise..

Also springs sag with age and use which compounds any differences…

As I said could be many other factors too..
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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Knocking sound over uneven surfaces

Post by Pondrew » Wed Mar 29, 2023 6:45 pm

john-e89 wrote: Wed Mar 29, 2023 5:46 pm There's only 10mm difference between M sport and standard height springs though right...?
Only if they are both the same. If you lift one side by 10mm it will push the other side down by x amount, as the weight distribution will alter. So the difference in height will be 10 + x. I think!

OP. It could well be the lower side 'bottoming' due to the above.
Last edited by Pondrew on Wed Mar 29, 2023 6:49 pm, edited 1 time in total.
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Knocking sound over uneven surfaces

Post by Rockhopper » Wed Mar 29, 2023 6:46 pm

I think Msport is 15mm lower than standard. I'd be quite happy to say that's not what's causing your knocking though.

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Knocking sound over uneven surfaces

Post by flybobbie » Wed Mar 29, 2023 7:14 pm

I would drive car forward and put on the ebrake.
Hopefully this will pull equally then measure.
Simply jacking up can cause a difference.

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Knocking sound over uneven surfaces

Post by B21 » Wed Mar 29, 2023 7:43 pm

Rockhopper wrote: Wed Mar 29, 2023 6:46 pm I think Msport is 15mm lower than standard. I'd be quite happy to say that's not what's causing your knocking though.
10mm on E89s 15mm on E85s
We choose to go to on with this endeavour at this time and do the other things, not because they are easy, but because they are hard..

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