simonk
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| posted on 17/11/08 at 11:18 AM |
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Viento Rear Top Wishbones Hitting CV Joints
Morning All
Have discovered that on compression my CV joints' allen bolts and the steel part of the boot retainer are fouling on the underside of the top
wishbone. Anyone else seen this ? I would have assumed that the car should hit the bumpstops before the CVs foul the wishbones ? Am I too fat ? Is my
spring rate / pre-load too low ? Have I assembled something wrong ?
Any suggestions appreciated.
Thanks
Simon
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Mr Whippy
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| posted on 17/11/08 at 11:24 AM |
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wind pre-load up a bit, where are the bumpstops away? in the coil over strut? pain in the bum to add unless the top unscrews
springs may also be a bit weedy too if you are....................a person who prefers pies
[Edited on 17/11/08 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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simonk
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| posted on 17/11/08 at 11:48 AM |
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First noticed yesterday after I had dialled out some of the negative camber to stop the tyres fouling the body sides on full bump - that's moved
the CVs in relation to the bones. Also first time yesterday with 2 adults in the car - probably 25st in total. Car looks perfect OTR with nobody in it
so perhaps I have to wind up the springs as you say and accept that it will look too high when empty. For reference the spring pre-load is set at
lowest - ie the springs are just held in place by the lower platform at full extension - I still think however that the design should be such that the
mechanical design should preclude the CVs hitting the bones within the normal range of suspension movement / adjustment - shouldn't it ?
Thanks
Simon
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Mr Whippy
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| posted on 17/11/08 at 12:20 PM |
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Just sounds like you have more travel than normal (alter the bump stops) and need to be realistic about the ride height if you are going to take
passengers. My beetle is so low that I can't take anyone in it unless I wind it up to suite but that’s just me being a fashion victim and bikers
often face the same problem. All part of the fun...
Fame is when your old car is plastered all over the internet
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simonk
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| posted on 17/11/08 at 02:25 PM |
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A low Beetle ! You must know all about excessive negative camber !!
Simon
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Paul (Notts)
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| posted on 17/11/08 at 05:39 PM |
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A lot of Viento owners have experienced the same problem at first. Normally on the passenger side of the car.
There are lots of ways in which this can be overcome.
1. Stiffer springs –I was supplied with 200lb 8 inch springs for the rear but quickly decided that they were too soft and part of the problem. Changed
them to 300lb 8 inch ( could possibly have fitted 9 inch –not sure )- this solved the bottoming out problem. I now plan to change to 275lb as I think
the 300lb may be a little too stiff. Have to play around and compare how they feel.
2. The rear wheels are too close to the chassis so you cant get much negative camber- this changes the angle of the cv/hub – I fitted 20mm hub centric
spacers on both rear sides because I could then run a little negative camber on the rear and secondly it spaced the rear wheels out in the arches so
that the looked much better (235 rear tyres on 8 inch rims)
3. Change the allan bolt s used in the CV joint to Dome head versions –not done this but the other two approaches sorted my problem out.
Hope this helps
Paul
( negative camber is the top of the wheels closer to the car than the bottom – I think ?? )
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rusty nuts
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| posted on 17/11/08 at 07:48 PM |
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What is the ride height at the rear measured from the chassis to the floor? It may be too low? You say the car looks OK when empty but does that mean
the wheel looks OK in the wheel arch? Reason I ask is that at the Newark show we had a load of Viento's lined up and most of them had the rear
arches fitted differently which affected the way they looked. Raising the ride height may cure your problem but make the arch look empty? Also well
worth checking the corner weights after setting ride height.
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simonk
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| posted on 17/11/08 at 09:44 PM |
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Thanks all
Yes, passenger side worse than driver's. Have now checked where the car sits empty with a full tank and found that there's only 0.75 inch
or so between the top of the shock body and the bump stop on each side, so the springs are fairly well compressed. They were set up at install with no
open pre-load at all so the car will be sitting pretty much as low as it can.
I'll try winding up the spring platforms initially and see how I get on. Only downside is that the wheels look fine in the arches now !!
Thanks
Simon
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wilkingj
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| posted on 18/11/08 at 12:24 PM |
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Simon, do you want me to come and sit in the car while you adjust the springs?
If its really bad, my 21 year old Son will be back from Uni in about a month.
Then we could both sit in your car whilst you adjust (Thats about 42 Stones between us).
Its funny, as I have not had this problem. Although my suspension is a bit hard.
Also I have 2.25" diameter shocks / springs not 1.9" ones.
I cant remember what the spring rates are, but I think they were heavier than what Luego (at Peterborough) recomended, as they were playing wioth
spring rates at the time.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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