# [200q20v] Re: Strut tower maximum latteral force.

Bernie Benz b.m.benz at prodigy.net
Thu Mar 8 16:32:50 EST 2001

```Hey, you strut bracers!  FYI, I just ran across this old post.

Bernie

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> From: Bernie Benz <b.m.benz at prodigy.net>
> Date: Thu, 06 Jul 2000 22:56:00 -0800
> To: Greg Johnson <gregsj at iea.com>
> Cc: 200q20V mailing list <200q20v at 200q20v.com>, audi-20v
> <audi20v at rennlist.org>
> Subject: Re: Strut tower maximum latteral force.
>
> Come on guys, Lets get realistic!
>
> There is just no need for anything heaver in a strut brace, as there is not
> much latteral force at that point.  I went thru this with another lister many
> months ago, but neglected to keep a copy.  He finely saw the light and, in the
> interest of keeping the economy strong, decided to just chrome plate the whole
> thing!  But, it went something like this:
>
> Front axle gross vehicle weight (fully loaded) being Audi defined as 2469 lbs,
> Now estimate the max. weight on the front outside wheel in a max.G turn, the
> ultimate being with the inside wheels off the ground, i.e. the full 2469 lbs
> on the outside front wheel.
>
> If the tire to road coefficient of friction is 0.3, the maximum latteral
> cornering force transmitted to the suspension at the axle would be 740 lbs.
>
> The suspension geometery divides this force between the lower link and the
> upper strut anchor point by the ratio of these two distances from the axle.
> On the type 44 chassis, Axle C/L to ball joint C/L = 4", axle C/L to strut
> piston rod anchor w/ a compressed suspension = 20".  Therefore 4/20 x 740 =
> 150 lbs force.  This is  the theoretical, far out, maximum latteral force that
> the strut tower will ever see!  (My strut brace further equalizes this force
> between the two strut towers to 75 lbs max.)
>
> Bernie
>
>
>> From: Greg Johnson <gregsj at iea.com>
>> Date: Thu, 06 Jul 2000 20:33:21 -0700
>> To: C1J1Miller at aol.com
>> Cc: 200q20v at brettd.dsl.speakeasy.net
>> Subject: Re: (no subject)
>>
>> No tearing or cracking but the hole is beginning to deform a bit and the
>> paint
>> has cracks in it;  88K miles with OEM S6 16in Avus wheels and Dunlop 2000
>> tires.
>>
>> I'd be interested in a strut brace!  Other than Bernie's, I don't think
>> anyone
>> has ever made one for the 200 series.  My understanding is that Bernie's is
>> not
>> meant to be a strut brace per se, but an alignment aid (help me out Bernie!).
>> Nonetheless, one might be able to create a heavy duty brace that follows the
>> same
>> path that his does.
>>
>> Greg Johnson
>>
>> C1J1Miller at aol.com wrote:
>>
>>> In a message dated 7/6/00 5:22:23 PM Eastern Daylight Time,
>>> rbw at swiftcorp.com
>>> writes:
>>>
>>>> Does anyone have a picture of this tearing/cracking issue? I'm not sure I
>>>> know what people are talking about. I don't see anything like that on my
>>>> car, and I was hit in the pass. side nose at one point.
>>>>
>>>> Rob Winchell
>>>> 91 200Q
>>>
>>> http://members.aol.com/c1j1miller/
>>> or direct to http://members.aol.com/c1j1miller/strut-web.html
>>> chris
>>>
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>>
>>
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