Author Topic: Steering wheel vibration  (Read 8417 times)

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Offline TURBOHEAD

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Re: Steering wheel vibration
« Reply #45 on: November 18, 2018, 16:03:10 PM »
I agree entirely.

The Calibra is an iconic car and has fans all over.......when I stop at traffic lights it's sometimes like an open air Auction......lost count of the times I have been asked "Do you want to sell it"

Pulled into Halfords car park....this guy in a flash Beemer drooled with glazed eyes........then it happened.......pssst.... .I will give you £5,000.00

As she stands right now.  I turned out him and his mate own a garage and are buying old school cars to do up and drive them to shows etc.

The reason I mentioned this is that my her indoors nags me with...."why can' we buy a modern car that doe's not keep breaking down" ?????

I said one day ...."I think I will sell my Calibra love"...........She was like foookin  Jeckle and Mr Hyde......"Don't you bloody dare Lol

Woman they never make sense...do they :-\

Anyway sorry to digress from poor wim_vg and his problems.......there will be good and bad times due to the age of Calibra's and deminishing

numbers.....we will soon be in No Tax needed.....Classic Car times..... 8)

Keep your chin up wim_vg.........if you do happen to cross the rage threshold....throw the Rubber Hammer at the windscreen....not the metal thingy Lol.  ... ;D

Offline wim_vg

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Re: Steering wheel vibration
« Reply #46 on: November 19, 2018, 20:33:42 PM »
Cheers all, I guess my wife thinks about the same about my old car... even if I tell her its younger than she is :-)

So... I managed to swap the steering gear and must say I got a relatively positive feeling about it. Steering feels much more certain and direct. It still jerks a bit but feeling is considerably less.
Still need to get an alignment done again... maybe some remaining symptoms from this, not sure. Planned for next Monday.

The other thing I could think of is that the new springs (which feel stiffer again), combined with the 17" ET44 wheel also contribute to it. Have been thinking of refitting the original springs, but not sure if worth the hassle.

Offline electric geen

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Re: Steering wheel vibration
« Reply #47 on: November 21, 2018, 22:22:50 PM »
Your running 17 inch rims with I guess rubber band tyres, (30 profile?) Definitely sure your wheels are ET44 not less? How is the car on self centering when you turn left or right whilst moving then let go of the steering wheel (low speed 10 mph 15 kmh) , does the steering wheel return by itself fairly slowly to the centre position or does it whip round or does not return at all? Trying to find out if your steering is stable or fidgety trying to fight you left or right whilst traveling in a straight line.

This behavior is governed by the castor angle which is not adjustable in the Calibra Suspension (the book say's it +2 degrees +/- 1 from the vertical which means that the suspension legs slope backwards (i.e. the top of the strut mount is in front of the hub centreline). The self centering of the steering wheel indicates what has happened to your castor angle - no return means 0 or negative castor, fast return means more than 2-3 degrees of castor angle. It can be measured with a protractor with level gauge, but if you go to a proper alignment place they should be able to measure it. (If the castor is really negative it will be difficult to steer (heavy) to the left or right).

Using low profile tyres without the ideal ET49 will cause a bump steer as the wheel's force on the suspension leg is offset (at the moment by 49-44 = 5mm) not a lot but you have virtually no sidewall to absorb that 5mm disparity. Try to get some normal Calibra wheels to try just on the front to eliminate the 17 inch wheels if it is affecting the steering/suspension. Vauxhall were very insistent on the ET49 as it made perfect geometry for their suspension set up regardless of the width of tyre (within reason).

Offline wim_vg

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Re: Steering wheel vibration
« Reply #48 on: November 21, 2018, 23:06:49 PM »
The wheels have 45 profile on them.

The steering is returning quite normal to center, but not to the full 100% - say a cm off or so.

I am thinking indeed more in the lines of bump steer now. Perhaps this feeling has also grown to me over time and 50% of it is personal perception. For example when my wife drives the car she does not report anything at all :)

Offline wim_vg

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Re: Steering wheel vibration
« Reply #49 on: November 28, 2018, 08:37:32 AM »
So the shimmy is still there in the steering wheel... not sure what else I can do :(

Offline electric geen

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Re: Steering wheel vibration
« Reply #50 on: November 28, 2018, 11:38:00 AM »
Arghhhhhhhhhhhh......... ..... The only time I get a shimmy at high speed is when my tyre pressures are uneven (slow leak through the rim). Try different wheels upfront if you haven't already.

Offline wim_vg

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Re: Steering wheel vibration
« Reply #51 on: December 04, 2018, 20:29:28 PM »
Hmm yes I will try that too. I wonder if it would help though, there is no shimmy when driving fast on a good road. Only the small bumps on worse roads do pull the steering wheel.

Would it really be bump steer? And if so what are attention points to look for?

Offline electric geen

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Re: Steering wheel vibration
« Reply #52 on: December 07, 2018, 21:08:23 PM »
I would change the wheels for standard calibra wheels first and try them to eliminate the aftermarket one's you have on now, after that, as you have tried everything else is to find a crash body repair shop who will put the Calibra on their table and find your problem in 5 minutes if it is a suspension or chassis geometry problem (they have all the measurement data for the chassis/suspension). Even if they find the chassis bent it's not the end of the world as it can be pulled straight (one time only though).

I am assuming you have been around every bush and joint on the car with a pry bar to check for bad bushes? including the anti-roll ones sitting on top of the front sub frame? Checked the front bearings for play?

Bump steer is caused by something very mis-aligned, it is not standard on production cars.

Offline wim_vg

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Re: Steering wheel vibration
« Reply #53 on: December 07, 2018, 23:38:32 PM »
Thanks for the help, appreciate it.

Yeah, I am pretty confident about all joints... also had a friend working at a professional dealer look at all of them and he said they were all tight.

The only thing that I am still not confident about myself, is the steering gear. I am suspecting the other one I installed being a second hand one also has play in the vertical direction. I am thinking about getting a refurbished one.

First I will try other wheels though!