[s-cars] active sway bar

[Cody Forbes]

http://www.racefabinc.com/images/racers5.jpg

Many many race cars since the 70's used adjustable roll bars much like the 
above pictured. What you are looking at is one leg of the bar, the link to 
the control arm goes at the small end. The adjustment is done by rotating 
that tapered bit. When in the position pictured the bar is at full soft, 
then as it rotates toward the flat leg being vertical it gets stiffer.

-Cody Forbes
http://www.5000tq.com
'87 5ktq - Fast.
'87 5ktq QLCC'd plus some
'86 5ktqCD
'86 5k
'86 5k


Theodore Chen wrote:
> steve's proposal is to have driver-adjustable anti-roll bars.  that's
> not unprecedented.  some race cars have them, though i believe
> they're mechanical, not hydraulic.  an automatic system with less
> twiddling of the rate might also work well; e.g., a system that
> simply stiffens the roll rate and holds it there when it senses that
> you're flogging the car, and softens it after you've stopped driving
> hard.
>
> -teddy
>
> ----- Original Message ----
> From: "Pasqualoni, James E" <james.pasqualoni at gs.com>
> To: sbpowers at gmail.com; tedebearp at yahoo.com
> Cc: s-car-list at audifans.com
> Sent: Sunday, October 28, 2007 8:06:16 AM
> Subject: Re: [s-cars] active sway bar
>
> Re: [s-cars] active sway bar
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> Is this a compnent of the new 'Active Steering' that is being
> employed by BMW?  Would certainly give the steering more "bite' in
> the twisties.
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>
> James Pasqualoni
>
>
> Boston Global Advisors
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> T: 617-204-2406
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> ----- Original Message -----
>
>
> From: s-car-list-bounces at audifans.com
> <s-car-list-bounces at audifans.com>
>
>
> To: Theodore Chen <tedebearp at yahoo.com>
>
>
> Cc: S-Cars <s-car-list at audifans.com>
>
>
> Sent: Sat Oct 27 11:48:10 2007
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> Subject: Re: [s-cars] active sway bar
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> your comment tells me that perhaps BMW haven't gotten it right, e.g.
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> the control part. I think the idea is sound but the implementation
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> isn't.
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> if it's dynamic that implies that they are pumping variable pressure
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> to the servo under computer control. the pressure into the servo unit
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> is what modifies the stiffness of the bar.
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> what if you replaced all that computer control crap with a hydraulic
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> screw pump, e.g. like what you have to adjust ride height on
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> motorcycle shocks. the only moving part is a "screw" into a cylinder -
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> pressure is increased/decreased by moving the "screw" into/out of the
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> cylinder.
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> that would allow one to set the stiffness and adjust it very easily
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> (within a range) if it needed changing.
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> Steve
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> On 10/26/07, Theodore Chen <tedebearp at yahoo.com> wrote:
>
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>> bmw calls it dynamic roll control.  if you like driving, run away!
>> it's part of what causes the recent bmws to feel more like video
>> games.
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>> ----- Original Message ----
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>> From: Steve Powers <sbpowers at gmail.com>
>
>
>> To: S-Cars <s-car-list at audifans.com>
>
>
>> Sent: Friday, October 26, 2007 9:08:27 PM
>
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>> Subject: [s-cars] active sway bar
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>>
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>> I was at a high-end body shop yesterday here in Seattle and got a
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>> chance to eye a BMW 5-series rear subframe up close and personal. The
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>> unit had been entirely removed from the car with the wheels and
>> struts
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>> still attached and undamaged.
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>> I couldn't help but notice the servo lump with hydraulic lines
>> located
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>> smack dab in the middle of the rear sway bar. It's an active
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>> suspension (anti-roll) mechanism that is controlled hydraulically.
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>> Assuming the rates were done properly, would be a pretty
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>> sweet-adjust-it-from-the-driver's-seat sort of gizmo.
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>> Otherwise, it would be a large sinkhole for Pentosin.
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>> I could see some here (hi Hap!) modifying such a beast for use in
>> our cars...
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>>
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>
>> Steve Powers
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