How much stiffer with solid or tied in roof? |
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How much stiffer with solid or tied in roof? |
Mueller |
Dec 12 2004, 11:17 AM
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#21
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None |
New car has no cage, I know the 914 tends to flex and that the factory welded steel roofs on the 916 for what I guess was to help stiffen them, or was it for other reasons??
The 'glass top should help a little, but I was wondering about attaching tubes or the like from the factory roll bar to the windshield hoop to stiffen the car up.... Has anyone played with this before?? |
Bigbohr |
Dec 14 2004, 07:50 PM
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#22
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Superlurker Group: Members Posts: 224 Joined: 19-September 03 From: Houston, TX Member No.: 1,176 |
Just wondering how much reinforcing the rails would help. The problem is lack of torsional stiffness because the car has two rails on the outside with a floorpan, and not because the rails are too limber. Due to the design, stiffening the rails will help a little but not that much.
If we assume the height of the rails can't be changed (look at an Elise for example), the only other solutions I see is to either mount a steel roof or create a backbone (like the C5/6 Corvettes, Lotus Elan). I don't think there is enough space between the seats to fit a backbone. As an alternative to a steel roof, putting crossbraces between the targa and the windshield frame is prolly not such a good idea in the long term cause you create serious stress concentrations. Installing a full roof so the loads are more evenly divided between the A pillars should be better. I've been thinking about how to increase torsional stiffness for a while now and I think I'll just live with what I have ... I ain't putting no stinkin' fixed roof on my 914. |
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