Author Topic: Steering wheel vibration  (Read 14983 times)

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Offline TURBOHEAD

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Re: Steering wheel vibration
« Reply #75 on: March 12, 2019, 16:52:15 PM »
Hi wim

The drop links fitting info in my Calibra Haynes manual advises to measure the distance between the top surface to the bottom surface to ensure the correct compression of the rubber bushes.      The recommended distance should be.....38.0mm to 39.0 mm....measured using manual or digital calipers.

How your car behaves on different road surfaces depends on the type of suspension.....tyres and correct inflation ....how your suspension is set up and fitted etc etc.   If any of the components are worn....damaged....or not fitted correctly can cause problems.

I think you have done really well so far with changing related suspension parts......but after all this you will have to accept that you may have to live with it........unless someone can find the exact cause and fix it.

That eureka moment is well overdue.......I don' feel that your car is dangerous to drive.......it is just a niggling quirky thing that persists but can be safely ignored.

Offline wim_vg

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Re: Steering wheel vibration
« Reply #76 on: March 12, 2019, 20:28:03 PM »
Thanks again, much appreciated. I do realize that some of it I have to live with... MOT check also does not show any concerns, which I guess adds to being reassured it is not a safety concern. It does also get to your head over time and becomes worse just because of that!

Well, I do have a Haynes manual and indeed it refers to measuring that distance. Right now, it measures about 41mm, but feels already really tight... hence a bit scared to overtighten and actually break the drop link. Well, maybe it will not happen... in any case, I've ordered some spare drop links and will give it another go once I have them :)

Thanks again for all the support!

Offline electric geen

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Re: Steering wheel vibration
« Reply #77 on: March 16, 2019, 20:15:46 PM »
Wim_vg, I looked at the video too and can see what you mean by crashing coming through the steering wheel. You are on concrete roads going over the sections (we can hear) then you come to some real bad ones and you get a thud going through the whole car.

I had this problem with an XJS years ago and it comes down to this. Your suspension is to stiff, it would rather push the body of the car up than absorb the bumps, however, the faster you go i.e. 80mph+ the ride is smooth and the car feels well planted. Tricky situation. Technically there is nothing wrong yet the crashing suspension says there is. Your springs and shocks - your shocks especially are too stiff and are not giving in to sharp shocks but maybe are to slower bumps. Are your shocks really quality items you can vouch for? or ebay knock offs (unknown to you). I changed my shocks on the XJS for some really expensive ones that I personally collected from a distributor with long track record of quality (but not the cheapest distributor). The video to me shows unresponsive shocks - they just not working.

Offline TURBOHEAD

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Re: Steering wheel vibration
« Reply #78 on: March 17, 2019, 13:52:06 PM »
Hi wim  :)

I watched your video again also.......but concentrated on the sound side using head phones for the first time.  The noises Indicated a harsh response as you have been saying all along.

Can I just point you to a website called......." strutmasters.com".....they give 5 points you should experience after fitting new shocks and springs.
They say new shocks and springs need time to break them in etc.......and that new springs will eventually bed down to a softer performance.

Electric green......has advised that your suspension is too stiff and is not performing correctly..........be it to do with Strutmasters
Comments about new shocks and springs or faulty ones.  New items don't always mean good working order >:(

You have checked and had checked by other people....all of the subsidiary' components ......and those parts have been ruled out.
So we are left with possible faulty or poor functioning shocks and springs. They say that in production only a random batch of items are tested
so the new springs that go through.......have never had a large weight put on them prior to You fitting them.

Offline wim_vg

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Re: Steering wheel vibration
« Reply #79 on: April 02, 2019, 07:51:51 AM »
Hi all,

Well, good news is that the springs are actually quite soft. I fitted new ones... sorry forgot to mention. So spring rate seems irrelevant.

What seems to improve... oddly, by chance I tightened the nuts on the drop links some more and the car was a lot more stable. If only temporarily though for about a week or so, then it turned again to unstable.
I am also hearing a faint knock from the front side... could it be that the drop links, although fairly new, are not OK? Visualy it is hard to see anything wrong really...

Cheers

Offline TURBOHEAD

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Re: Steering wheel vibration
« Reply #80 on: April 03, 2019, 14:00:27 PM »
Hi wim :)

It's good to hear that by a bit of tweaking you have made has given some improvement.......spring s and how they operate is crucial to how they absorb rough road surfaces...........regar ds the drop links.

I would check the threads on the drop links and also the threads on the securing nuts for any evidence of thread dammage.  The best nuts to use is  "Nylock Nuts" which by there construction will lock in position .........after proper tore settings are used.

You are definitely in the right area of investigation so to speak...........I have had nuts that tighten almost to the correct Tory when one more slight turn with the spannner pops loose >:(

In manuals they always advise to fit New nuts and bolts........but it's easy to ignore this advice thinking the fixings you have removed seem ok.

You will solve the problem at some point......good luck  8)

Offline wim_vg

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Re: Steering wheel vibration
« Reply #81 on: May 14, 2019, 21:38:03 PM »
Hi again,

So I reckon some of the fine-tuning is in the proper fixing of the suspension components... this I can live with!

However, there is something about it that still puzzles me. The steering wheel oscillation seems to vary day by day. One day it is much more pronounced than others. I am pretty sure it is not just a feeling. Any ideas to what could contribute to that?