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Reducing Bumpsteer in an AP1

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Old Jun 25, 2006 | 09:01 AM
  #11  
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"you guys"?

I believe I told him to stay stock
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Old Jun 25, 2006 | 09:26 AM
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I think that's what we all said.
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Old Jun 25, 2006 | 12:14 PM
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since spring compression was alluded to... would having stiffer springs (w/Koni shocks)...let say in the 400lbs range, significatly lower the dynamic toe change under compression?

i for one can really isolate the bumpsteer now that the car is on a much more aggressive alignment from previous general twitchiness ...

but wondering if a stiffer spring set can alleviate it? so i dont need to spend money on the BSK ...

im planning on a shock/spring combo as is (for next year) ... so i'll have to spend money on that anyways...
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Old Jun 25, 2006 | 12:33 PM
  #14  
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no springs an alignment don't change it. You would need to run springs that have almost no travel to remove it.

Even at over 800lbs of spring I'll still get over 2" of travel.

again, the bumpsteer is not an issue of springs (for the most part) or alignment (not at all). It's an issue of the suspension geometry.

That being said a good driver can drive around the bumpsteer, but its still there. I still don't have a bsk on my street car.
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Old Jun 25, 2006 | 12:34 PM
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Nothing but a suspension geometry change can alter the amount of toe change caused by suspension movement.
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Old Jun 25, 2006 | 12:39 PM
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Sure reducing suspension travel will reduce the toe deflection but nothing is free. I suggest you change spring rates for the +/- of doing so rather than trying to solve a different problem. If your alignment has introduced bump steer then you should change your alignment.
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Old Jun 25, 2006 | 12:42 PM
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How will reducing suspension travel change the rate of toe deflection?
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Old Jun 25, 2006 | 12:53 PM
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Originally Posted by cthree,Jun 25 2006, 03:39 PM
Sure reducing suspension travel will reduce the toe deflection but nothing is free. I suggest you change spring rates for the +/- of doing so rather than trying to solve a different problem. If your alignment has introduced bump steer then you should change your alignment.
no...what i meant by "isolate" is that, before the car felt just twitchy and unstable through an entire sweeper... now that its on its current alignment, the car is mostly stable in the turn, except when it hits the little bumps and dips where i can clearly see the bumpsteer...then the car comes back to being more stable untill it hits the next bump...

the spring change is not planned for bumpsteer, i just asked since the spring compression was alluded to...
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Old Jun 25, 2006 | 02:30 PM
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Originally Posted by Ludedude,Jun 25 2006, 04:42 PM
How will reducing suspension travel change the rate of toe deflection?


Did I say it would change the rate of defection? I said it would change the amount of defection.
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Old Jun 25, 2006 | 03:54 PM
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Maybe so, but what happens when you limit travel and then you're bouncing off the bumpstops?
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