Register Login
Mr. FIAT
Reply
 
Thread Tools
Old 18-08-2011   #1
Join Date: Sep 2006
Location: cheshire
Posts: 205
Thanks: 8
Trader Rating: 0
United Kingdom 
rear suspension

Hello Men,

Something i noticed with the van on the Croma and also when i took the van off was the rear suspension "sagging".
Whilst away on holiday we moved from one site to another and every time she seemed to get worse even though the caravan nose wieght stayed the same.
Even with the van removed she seemed to take ages for her to come back to ride height level.
Are the springs a bit weak on them.Any mods that can be done?
Towed really nice though.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

buster is offline Reply With Quote Quote 
Old 19-08-2011   #2
Join Date: Feb 2008
Posts: 469
Thanks: 31
Trader Rating: 0
United Kingdom 
Re: rear suspension

Ah, you've discovered the Vectra rear suspension problem. Yes, the springs are very weak at the back in terms of towing. If they are loaded for long periods of time, they also tend to sag and stay sagged. Best solution I've found is to fit Vectra Estate rear springs, they are appreciably thicker than the Croma items. Downside is that the ride is slightly harder but on the plus side it handles better. There are a couple of other Croma owners on here who tow, hopefully they'll have more to add.
Thanks Caravadossi thanked for this post
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

DoIDon'tI is offline Reply With Quote Quote 
Old 19-08-2011   #3
Join Date: Mar 2005
Posts: 1,496
Thanks: 66
Trader Rating: 0
United Kingdom 
Re: rear suspension

Thanks for the tip, Didi – I don’t tow, but would like to add the mod to my possibles list … may help to relieve my medical condition (Croma twitch).

Part No’s ? Presumably these are HD type & avoid the pig-tail flaw?

-------
55 Prestigio 1.9/16v150
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Caravadossi is offline Reply With Quote Quote 
Old 19-08-2011   #4
Join Date: Feb 2008
Posts: 469
Thanks: 31
Trader Rating: 0
United Kingdom 
Re: rear suspension

The ones on mine at the minute are second hand and have sagged a bit (before I got them - they were freefrom a chap on the Vectra-C forum so I don't mind ) so in the next couple of months I will be getting some like these. Had a look in the KYB book at my local motor factors yesterday and there is only one part number listed for all Vectra estates between 2002 and 2008. I don't know what the vauxhall part number is though - sorry.

I've had mine fitted for two years now with no ill effects. I would avoid fitting lowering springs though, the Croma has too much negative camber at the rear anyway (which is why it deforms the tread blocks on the inner shoulders of the rear tyres, leading to excessive road noise / sounds like a rear wheel bearing has gone) and lowering makes things worse.

Pig-tail issue is still present but the spring material is much thicker than the Croma standard items, I reckon about 2-3 mm thicker. This should help them last a bit longer. Bad design I'm afraid.

On the subject of your twitchy rear end I had a similar problem when I got mine. Rear wheel alignment helped a lot, and since I fitted Bilstein B4 shocks I've been happy with the way the back of the car behaves. 18" wheels also makes things worse, especially when the tyres wear down a bit

Hope this helps.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

DoIDon'tI is offline Reply With Quote Quote 
Old 19-08-2011   #5
Join Date: Dec 2006
Location: Southampton, Hampshire
Posts: 2,352
Thanks: 170
Trader Rating: 0
United Kingdom 
Re: rear suspension

On Croma / Vectra etc the standard manufacturer springs are of tapered wire size. i.e. the diameter of the spring wire in not constant. Thinner at the ends thicker in the middle. This gives rise to softer ride for small deflections with increased resistance with heavier load. I don't no if the Vectra Estate updated springs are the same.

I have fitten after market Kilen springs. These are full thickness wire over the full spring length. No sag or excessive deflection with load that I have noticed.

Personally I would say skip Fiat or GM springs and go straight for Kilen ones.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

s130 is offline Reply With Quote Quote 
Old 20-08-2011   #6
Join Date: Mar 2005
Posts: 1,496
Thanks: 66
Trader Rating: 0
United Kingdom 
Re: rear suspension

My notes from late 2009 re springs - but now 21 months on, not sure how accurate they are …

SPRINGS
51755684 (M88, M89, +007) 2.24kg £76.02/pair (2005)
51754215 (M92) 2.24kg £76.02/pair (2005)
51757484 (M42) 2.75kg £76.02/pair (2005)
51755500 (M95) 2.75kg £84.29/pair (2005)

Lesjofors
40 261 85 (Front Coil Spring)
40 261 33 (Rear Coil Spring)

KYB Springs: Tel. 01925-417444
1.8/16v RH2658
1.9/16v 115/120: RH2661
1.9/16v 150: RH2698?
2.2/16v RH2661
2.2/16v RH2658

I recall speaking with someone at KYB, who advised they did have a constant dia. spring for the Croma/Vectra – but only for the rear.

I’ve only lost one spring (o/s/f) during my term - & this was replaced with a Kilen 12168.

My `Croma twitch’ is a neck muscle complaint - aka a nervous tic or involuntary movement that comes on when I taxi out for take-off! Any idea where I can pick-up a second-hand Martin-Baker GQ-7A seat?

55 Prestigio 1.9/16v150 (Mach 0.17)
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Caravadossi is offline Reply With Quote Quote 
Old 20-08-2011   #7
Join Date: Feb 2008
Posts: 469
Thanks: 31
Trader Rating: 0
United Kingdom 
Re: rear suspension

Hope you've got the 'Skydome' fitted as ejection might prove painful otherwise...
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

DoIDon'tI is offline Reply With Quote Quote 
Old 21-08-2011   #8
Join Date: Jun 2009
Location: Durham
Posts: 29
Thanks: 0
Trader Rating: 0
United Kingdom 
Re: rear suspension

Quote Originally Posted by buster View Post
Hello Men,

Something i noticed with the van on the Croma and also when i took the van off was the rear suspension "sagging".
Whilst away on holiday we moved from one site to another and every time she seemed to get worse even though the caravan nose wieght stayed the same.
Even with the van removed she seemed to take ages for her to come back to ride height level.
Are the springs a bit weak on them.Any mods that can be done?
Towed really nice though.
I used spring assisters on mine for a while untill I had to replace the springs,haven't got round to fitting them again after the garage removed them.
Car didn't bottom as much with them on when towing,even solo it didn't affect the ride.
__________________
FIAT Forum Useful Links:
Donate to FF | Buy FF Merchandise | Classifieds | FF Insurance | How-to Guides | FAQs

Gordon28 is offline Reply With Quote Quote 
Reply
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump
Similar Threads
Thread Thread Starter Forum Replies Last Post
(G) Rear suspension gone? MaximusPrimal Marea 2 06-02-2011 22:22
(T) rear suspension chunk77 Punto (Mk2/2b) 6 01-07-2008 23:42
(T) Rear Suspension mick_131 X1/9 0 23-07-2007 14:21
(G) Suspension parts,where to buy,how to check? Rear suspension guide? kritip Cinquecento / Seicento 6 31-07-2006 15:59
(T) rear suspension punto_punta Punto (Mk2/2b) 4 20-06-2004 05:52