Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: SOPRANO999 on 06 May 2015, 08:48:55

Title: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 06 May 2015, 08:48:55
Here goes

Had my car for a few months now and know when its wet to take care however I have an issue with the rear end 'drifting' worse on one side than the other.

I do find i have to take extra care when its wet despite the car being heavy - and thats driving normally and sensibly. The back end seems very light however I almost came a cropper this morning so need some advice.

The rear right end seems to kick out and slide far too easy at very low speeds with even light touch of the accelerator - more so than the other side i.e. if making a left turn.

Its not my imagination and both sides have the same tyres fitted (dont seem to be premium brands).

Been scratching my head as to why one side is a bit more prone than the other - especially at low speed. Tyre pressures are the same , nuts are all tight.

Getting to the stage where I am considering getting rid of it unless i can come up with a solution :( any ideas
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: Kevin Wood on 06 May 2015, 11:13:56
Well, something's certainly wrong, as a properly set up Omega is pretty firmly planted, even in the wet.

I would start with the basics - tyre pressure and condition on both ends. Sounds like you've eliminated that. Try reducing the pressure at the rear a little (no less than 30 PSI, though).  What brand of tyres do you have on it? Some just don't agree with the Omega.

Next, check all suspension bushes - front wishbone bushes can give the sensation of the rear end "giving" if they are shot, and if they haven't had attention in the last 3 years or so they probably will be. Replace the front bush with a poly bush and the rear with a genuine GM replacement. Rear subframe "donut" bushes are likely to be past their best, too, if they haven't been recently changed. Also worth checking the triangular central rear subframe bushes in front of the diff.

Once that's all known to be OK, get a proper 4 wheel alignment done and check that the thrust angle ends up close to zero, and the front camber wants to be no more than about -1o10' - -1o15'.
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: 05omegav6 on 06 May 2015, 11:55:06
Failed rear diff blocks gave a very similar sensation on my estate...
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 07 May 2015, 07:42:13
Well, something's certainly wrong, as a properly set up Omega is pretty firmly planted, even in the wet.

I would start with the basics - tyre pressure and condition on both ends. Sounds like you've eliminated that. Try reducing the pressure at the rear a little (no less than 30 PSI, though).  What brand of tyres do you have on it? Some just don't agree with the Omega.

Next, check all suspension bushes - front wishbone bushes can give the sensation of the rear end "giving" if they are shot, and if they haven't had attention in the last 3 years or so they probably will be. Replace the front bush with a poly bush and the rear with a genuine GM replacement. Rear subframe "donut" bushes are likely to be past their best, too, if they haven't been recently changed. Also worth checking the triangular central rear subframe bushes in front of the diff.

Once that's all known to be OK, get a proper 4 wheel alignment done and check that the thrust angle ends up close to zero, and the front camber wants to be no more than about -1o10' - -1o15'.

Thanks mate - its due an MOT in a few weeks so ill get it all checked asap. Tyres are cheap ones that were on when I got it- loads of tread but not a known brand name. Ive owned BMW's and Lexus in the past and know how to drive rwd but its all over the place! the rear right wheel spins when pulling from wet worse than the left - im like a granddad crawling round roundabouts and corners in the wet!! lol

Ill get searching now - and let u know how I get on- cheers  :D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 07 May 2015, 07:43:33
Failed rear diff blocks gave a very similar sensation on my estate...

Hi Taxi Al - excuse my lack of technical knowledge  - I know what the diff is but what is the diff block ?? lol :-\
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: 05omegav6 on 07 May 2015, 08:18:37
Two oppsing great lumps of rubber that hold the back of the rear subframe off the floor... usually fail as a direct result of jacking the car by the diff :y
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 07 May 2015, 09:59:01
Two oppsing great lumps of rubber that hold the back of the rear subframe off the floor... usually fail as a direct result of jacking the car by the diff :y

Brilliant! ill have a peek  :y ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 02 June 2015, 13:16:58
Been away for a couple of weeks but turns out i have a leaky shocker on that very side - however still handles like a figure skater on wet roads  >:(

getting the shocks changed next week and tempted to bin-off the cheapo 'Autogrip' tyres currently adorning the rear as they sound like bargain basement jobbies and may not be helping either!

Ill keep you posted to see if it helps- all rear bushes appeared to be in good order!
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: RossPhim on 02 June 2015, 13:58:00
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 02 June 2015, 14:06:59
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: RossPhim on 02 June 2015, 15:20:12
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
I was driving to the conditions, and they were crap, really crap!
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: chrisgixer on 02 June 2015, 23:57:29
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
There really is something in the water up in Northants isn't there! ;D

Thing is that's the trouble with the Autoshits. They are so appalling that no conditions exist that suit them. Other than burning in a skip of course. Does Bg drive in a burning skip I wonder ? ;D

Ordinarily most cheap tyres work to a certain level in the dry, then get caught out when it rains as there is shuch a vast difference in wet and dry performance people don't expect the grip to tail off so badly when it rains.
 But with the Autoshits they don't work in the dry either. Unless tip toeing round everything that smells like a corner of course, and on the brakes....and on acceleration actually.

In fact what conditions would these be Bg?


Absolutely THE worst tire on the market.
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: 05omegav6 on 03 June 2015, 00:03:45
They do have one redeeming feature...

They never wear out... :D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: dbug on 03 June 2015, 00:07:04
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
There really is something in the water up in Northants isn't there! ;D

Thing is that's the trouble with the Autoshits. They are so appalling that no conditions exist that suit them. Other than burning in a skip of course. Does Bg drive in a burning skip I wonder ? ;D

Ordinarily most cheap tyres work to a certain level in the dry, then get caught out when it rains as there is shuch a vast difference in wet and dry performance people don't expect the grip to tail off so badly when it rains.
 But with the Autoshits they don't work in the dry either. Unless tip toeing round everything that smells like a corner of course, and on the brakes....and on acceleration actually.

In fact what conditions would these be Bg?


Absolutely THE worst tire on the market.

Since when did Huntingdon move to Northants  ;D ;D ;D ;D ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 03 June 2015, 06:56:29
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
There really is something in the water up in Northants isn't there! ;D

Thing is that's the trouble with the Autoshits. They are so appalling that no conditions exist that suit them. Other than burning in a skip of course. Does Bg drive in a burning skip I wonder ? ;D

Ordinarily most cheap tyres work to a certain level in the dry, then get caught out when it rains as there is shuch a vast difference in wet and dry performance people don't expect the grip to tail off so badly when it rains.
 But with the Autoshits they don't work in the dry either. Unless tip toeing round everything that smells like a corner of course, and on the brakes....and on acceleration actually.

In fact what conditions would these be Bg?


Absolutely THE worst tire on the market.

Since when did Huntingdon move to Northants  ;D ;D ;D ;D ;D
Nice to see you back sir.. :y :)
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 03 June 2015, 07:00:06
Also we have to remember, that a select few regard their daily commute,and every day driving experience as a qualifying lap, that has to be bettered every day.
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: Mr Gav on 03 June 2015, 12:54:40
Autogrip tyres have no grip whatsoever, I've had some bad experiences of nearly bring killed in the wet, they should be sued under the trades description act ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: chrisgixer on 03 June 2015, 13:53:10
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,
There really is something in the water up in Northants isn't there! ;D

Thing is that's the trouble with the Autoshits. They are so appalling that no conditions exist that suit them. Other than burning in a skip of course. Does Bg drive in a burning skip I wonder ? ;D

Ordinarily most cheap tyres work to a certain level in the dry, then get caught out when it rains as there is shuch a vast difference in wet and dry performance people don't expect the grip to tail off so badly when it rains.
 But with the Autoshits they don't work in the dry either. Unless tip toeing round everything that smells like a corner of course, and on the brakes....and on acceleration actually.

In fact what conditions would these be Bg?


Absolutely THE worst tire on the market.

Since when did Huntingdon move to Northants  ;D ;D ;D ;D ;D

Clearly drinking Northants water. And no mistake! ::)
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: chrisgixer on 03 June 2015, 17:25:28
...but what's Huntingdon got to do with it? ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: terry paget on 03 June 2015, 21:22:52
Leaky shock could be oiling a rear tyre, unlikely I grant you. More likely reason for slipping one is only is weight of the driver, presuming he is the only person in the car.
 I used to be keen on the sport of autotests - racing round pylons in a private car park. The party tricks were handbrake turns and 'flip turns'  In a flip turn the car is driven at speed backwards, the driver applies full right lock, applies foot brake hard, declutches, engages first gear, centres steering, engages clutch, applies power, and proceeds forwards. Sounds complicated but with practice is easy. I mention it because it is vital it is performed right hand down. That way car is stable because the driver's weight keeps that side on the ground. Done left hand down the car will almost certainly turn over. I have witnessed it several times.
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: dbug on 03 June 2015, 23:06:27
...but what's Huntingdon got to do with it? ;D
Engage brain (or in your case the brain cell ;D ;D) before opening gob.  You have a pop at biggriffin and comment re water in Northants - yet if you looked BG lives in Huntingdon - hence my post
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: chrisgixer on 03 June 2015, 23:10:39
...but what's Huntingdon got to do with it? ;D
Engage brain (or in your case the brain cell ;D ;D) before opening gob.  You have a pop at biggriffin and comment re water in Northants - yet if you looked BG lives in Huntingdon - hence my post

Ayup. Charmer's on. ;D

What's where he lives got to do with it? Or can he only drink water at home according to dbug? ;D

Also, if not using those death trap Autogrips one might find the driving conditions will change very much for the better. ::) ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 04 June 2015, 06:30:35
I do find that auto-grips come in different guises, and the ones I have fitted suit my driving style, I don't require a skate-board set-up on my barge, I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: Mr Gav on 04 June 2015, 09:14:01
I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)

What water would that be then? Dry water  ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 04 June 2015, 09:56:46
I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)
:)
What water would that be then? Dry water  ;D
We have very magical water around hoof'er land,  :)
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: 05omegav6 on 04 June 2015, 10:10:41
I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)
:)
What water would that be then? Dry water  ;D
We have very magical water around hoof'er land,  :)
A secret blend of DDT and red diesel iirc and liberally applied to most of the east midland area as an aerosol... :-X
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 05 June 2015, 09:44:47
I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)
:)
What water would that be then? Dry water  ;D
We have very magical water around hoof'er land,  :)
A secret blend of DDT and red diesel iirc and liberally applied to most of the east midland area as an aerosol... :-X
Our special water comes from
Grafham water, which is owned by
www.anglian water.co.uk (http://www.anglian water.co.uk)
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: biggriffin on 05 June 2015, 19:40:51
Whoops I got it wrong, and I will admit to it.
 I have autoguards on my barge.not autogrips.
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: chrisgixer on 06 June 2015, 00:10:15
News flash. Dry water affects memory. ;D


Thought something wasn't right. A claim Autogripshits work well. Nooooo no WAAYYYY! ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 10 June 2015, 20:03:45
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y
Got them on my estate,they grip fine in all weathers, try driving to the conditions,and not like Russel mikola,McRae,

Drive to the conditions?? 10-15 mph around a corner with barely a touch on the throttle?? Cant be more careful unless I stopped on the roundabout- they are horrendous!
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 10 June 2015, 20:05:48
When I picked up my current mota, which is FWD, it has those Autogrip 'things' wrapping the rear wheels, and in slightly damp conditions, the rear of the car wanted to overtake the front.  :(
They were utter 'pish' as we say up here!  :-[
Ditch the Autogrips, before they ditch you!  :y

hahahha! yeah I don't think the shocks helped but but they are done now. Even slightly damp conditions I literally have to crawl round a roundabout. They will be coming off asap and replaced with Rainsports :) - I have read about them on an old post- deathtraps. Thought I was a goner last week when I hit surface water!!  >:(
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 10 June 2015, 20:07:53
They do have one redeeming feature...

They never wear out... :D

Funny you should say that...........passed MOT today and the examiner commented that my front alignment may need done as slight wear on the tyre. He did comment that the back ones looked new so you are right !!! :) harder than a tree knot so im taking them off before I end up round one   ;D
Title: Re: Twitchy rear end on my 2.2 Saloon- one side worse than the other
Post by: SOPRANO999 on 10 June 2015, 20:10:26
I do find that auto-grips come in different guises, and the ones I have fitted suit my driving style, I don't require a skate-board set-up on my barge, I can still go round corners at the same speeds as I did before, even when its raining the special water. 8)
 also welcome back Mr dbug :)

BIG G - it must be the Scottish water up here - mind you it is summer now-in double figures

Minus 10  :) :) :) ;D :D