maximill666
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| posted on 18/9/08 at 08:41 PM |
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Vortx self centering help
I had my SVA a few days ago and unfortunately it failed on some minor issues and one of the failure points was no self centering of the steering, I
would like some advice regarding this issue as the car does not even slightly try to self center.
My first question is; Are the geometry settings stated in the MNR build manual correct?
Front camber 1 to 1.5 degrees of negative camber
Rear camber .5 to 1 degrees of negative camber
Front tracking 1 to 1.5mm toe out
Rear tracking 1 to 2mm toe out
I agree with the camber settings but the tracking settings seem a little strange?
Also there seems to be no caster adjustment, I have measured this and it is currently 5 degrees positive.
From previous experience I believe the way to increase self centering is to increase caster angle, but It seems this is not possible?
Any help would be much appreciated.
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DarrenW
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| posted on 18/9/08 at 09:19 PM |
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Its possible that you need to apply a set of SVA settings for the test then redo them so it drives OK. Thats how i had to do mine anyway - i know its
not a MNR but most cars seem to follow this rule.
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Mal
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| posted on 18/9/08 at 09:52 PM |
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Temporarily increasing the front tyre pressures to 30 psi will help.
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maximill666
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| posted on 19/9/08 at 12:42 AM |
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(Temporarily increasing the front tyre pressures to 30 psi will help.)
Already tried the increased tyre pressures (35psi), and it made no difference.
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stuart_g
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| posted on 19/9/08 at 07:55 AM |
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I was told to set my car up with the following settings
-1 to -1.5 degree's camber all round
1mm toe in all round
For sva I had no toe and 0 camber all round and passed first time.
Have you got the top wishbones on the correct way. The ball joint for the upright should be behind the bottom wishbone upright ball joint when viewed
from the top making the upright itself lean backwards when assembled. Just a thought.
[Edited on 19/9/08 by stuart_g]
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Agriv8
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| posted on 19/9/08 at 08:03 AM |
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Which sterring rack are you useing ie,
Shortened sierra or Escort ?
Also
Sierra or Cortina Hubs ?
everything else looks ok can you post up some photo's of the front ?
regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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maximill666
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| posted on 19/9/08 at 08:48 AM |
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Yes the top wishbones are on the correct way round.
Its a sierra rack with sierra uprights/hubs
I currently have the front and rear tracking set at 1mm toe in all round, not as per the build manual (toe out?)
Regards,
Lee.
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paulmw
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| posted on 19/9/08 at 09:00 AM |
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I tried all the tricks on my Indy and it never self centred
I cheated and put some valve springs in the rack which did the trick.
Paul
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Agriv8
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| posted on 19/9/08 at 06:32 PM |
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Ok then a few futher things to check.
1 that the steering shaft runs freely in the sierra body.
2 that the mushroom incerts have the hole facing towrds the front.
3 have you tried winding more spring on the read ( transfer more weight to the front )
Let us know if any of those help
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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maximill666
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| posted on 21/9/08 at 11:35 PM |
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Mushroom inserts are now facing forward
Raised rear ride height, to transfer more weight to the front.
Front camber set at 1 1/4 degrees negative
Front tracking 1mm toe in
Front caster 7 degrees positive
Still no self centering & with the geometry settings above it should self centre so I have now come the conclusion that the problem must lie
within the rack as it feels a tight even when the hubs are disconnected.
I believe the rack tension can be adjusted from the slipper plug on the top of the rack, but is this a simple matter of turning it with an allen drive
socket or is there more to it than that?
Regards,
Lee.
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Agriv8
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| posted on 22/9/08 at 07:09 AM |
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Lee,
Sound like you have found the problem. The shaft should be easy to push through with a small amount of resistance and no lateral play
I belive it should be that simple for the adjustment but I think they have a tendancy to be FT. The shaft is pushed against the nylon
'Shoes' so you need to reduce the friction between the 2.
Regards
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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maximill666
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| posted on 28/9/08 at 10:29 AM |
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Got it all sorted out now
It was the rack that was too tight, adjusted the slipper plug & hey presto got self centering. My god it was tight to undo though.
Thanks for your help guys
Regards,
Lee
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Agriv8
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| posted on 30/9/08 at 07:02 AM |
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Lee,
Thank gawd for that 
Get the SVa finished and then book in to MNR or somwhere for a setup ( corner weights, tracking, camber ect).
Good look with the re-test
Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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