UK & Ireland S2000 Community Discussions related to the S2000, its ownership and enthusiasm for it in the UK and Ireland. Including FAQs, and technical questions.

High Speed Instability

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Old Dec 6, 2005 | 11:07 AM
  #11  
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Sure it wasn't just tramlining? Did the road have any of those smooth indentations caused by heavy lorries?
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Old Dec 6, 2005 | 11:52 AM
  #12  
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Are sure it isnt anything to do with the front and rear strakes. apparently they aid high speed stability. some cars have them and others dont. been looking into this as mine doesnt.
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Old Dec 6, 2005 | 01:04 PM
  #13  
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I was doing 146 the other night and it felt very sensitive, but not remotely unstable.
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Old Dec 7, 2005 | 01:29 AM
  #14  
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Originally Posted by trinis2001,Dec 6 2005, 08:01 PM
Thanks, for the responses.

I never did get a chance to try that speed on my S02s which are brand new, but now reserved for auto-crossing. These RE050 tyres had about 3 months of usage before I got. I had the car aligned just recently, and they did leave a little castor imbalance, say around 5.x on the left and 6.x on the right. But the wobble seems to come from the rear. I thought it may be pressure (currently set at 30.5 F, 31 R cold psi), so I will try to up it to about 33psi and see next time I find that piece of road.

Cheers.

BillyB
Castor imbalance will tend to cause wandering or chasing the camber, as well as asymmetric reaction to bumps. But that is a front-end effect.

I suspect the problem is with the rear geomerty/RWS effect.

Ideally, the car should be set up as equal & opposite as possible. Small differences make a big effect.
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Old Dec 7, 2005 | 02:51 AM
  #15  
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I think in this bad weather the s03s are a godsend, my car feels alot more stable at high speed on s03s than s02s.

I had 4 wheel lazer alignment the other day and they didnt get it exact on each side for some reason however they said it was within the tolerances.
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Old Dec 7, 2005 | 05:08 AM
  #16  
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Since it's a beautiful day, went out for a slide about.

Worn S-02s are very good in a straight line at full VTEC, if a little twitchy in the corners!
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Old Dec 7, 2005 | 11:51 AM
  #17  
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Originally Posted by Nick Graves,Dec 7 2005, 02:29 AM
Castor imbalance will tend to cause wandering or chasing the camber, as well as asymmetric reaction to bumps. But that is a front-end effect.

I suspect the problem is with the rear geomerty/RWS effect.

Ideally, the car should be set up as equal & opposite as possible. Small differences make a big effect.
Maybe unstable is too strong a word. Non-confidence-inspiring may be the better choice of words.

The highway was gently undulating and relatively new so it is very smooth with regard to the surface. The feeling I got was the same when i once had some soft-walled, high profile Avon tyres on my suspension tuned (read as hard as hell) civic. there is this definite feel of swaying, if ever so gently, when going in anything other than a dead straight line. Any corrections in steering makes the back feel like it want's to wag - not because of loss of traction, but more like rolling over on the sidewalls. It is all so subtle though - and this why I now say it does not inpsire me to try that too often.
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Old Dec 8, 2005 | 01:29 AM
  #18  
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These cars have passive RWS.

If you modify the suspension wantonly, that's what happens!
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Old Dec 8, 2005 | 02:42 AM
  #19  
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Originally Posted by Nick Graves,Dec 8 2005, 02:29 AM


These cars have passive RWS.

If you modify the suspension wantonly, that's what happens!
Would you consider putting the '05 wheels and tyres onto an '01 S wantonly modified? Does this mean one can't change the wheels of a S without running the risk of running off the road, even when changing to the package of a later model of the same car with correct offsets etc?

I find this hard to accept.
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Old Dec 8, 2005 | 02:45 AM
  #20  
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passive RWS
Is there any documentaion about this , I cant find any be good to see
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