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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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The 911, torsion bar coupe chassis is (still) remarkably stiff..on whatever design basis it was created from.
Like Bill V.... I would guess that even a bolt-in DAS roll bar ( rear section) is enough to increase torsional and maybe even longitudinal rigidity by a meaningful amount. I have a DAS in my 85 coupe . I've been toying with the idea of adding small tabs to the upper roll hoop near the B-pillars, to take advantage of the seat belt D-ring bolt ...and bolt the bar there too, as an additonal hard -mount point. The widely spaced places this bar bolts into the chassis must contribute to the 3D stiffness enhancement.
I don't have the numbers readily at hand about the torsional stiffness of the 911 body...but the value quoted here of 2000 ft- lbs/ degree seems artificially low. My recollection is that the number is closer to 6000-8000 ft-lbs / degree...maybe even 10,000 ft-lbs/degree. I'll continue to check my notes and resources and report back.
- Wil
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Wil Ferch
85 Carrera ( gone, but not forgotten )
Last edited by Wil Ferch; 01-06-2006 at 03:31 PM..
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