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It's a 914 ...
 
stownsen914's Avatar
 
Join Date: Jan 2008
Location: Scarsdale, NY
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Quote:
Originally Posted by island911 View Post
and then . .. make the uprights out of something appropriate.

I would be looking for some foil-section tubing.

Notice that virtually all purpose built race cars use uprights made of carbon, or even flat aluminum stock as Jack has used. I can't think of any that use aero tubing (though it's a neat idea). If you use aluminum, just make sure to use something thick enough, and use a nice stiff alloy like 7075, 2024, or even 6061.

Scott
Old 03-18-2012, 03:35 AM
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I have used foil shaped steel tubing in the past for A arms on formula Fords.
They were very light (gave the inspection techs some concern).
I wonder if something like that in Aluminum with Heim joints at the ends would be what you are looking for?
The Heim joints would give you infinite adjustability and good support while allowing some mounting deflection where they mount to the body.
As always Jack...I follow your endevours with anticipation....LOL
Bob
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Old 03-18-2012, 08:16 AM
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Flat aluminum stock seems to deliver the most bang for the buck. I just re-measured, and saw that I went from .13" thick to .08" -- no surprise it buckled. I like the idea of streamlined tubing, but the fore-aft aspect of it would need reinforcement, especially with my not-very-strong base arrangement where the uprights connect to the decklid.
Old 03-18-2012, 09:00 AM
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Max Sluiter
 
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Quote:
Originally Posted by HawgRyder View Post
I have used foil shaped steel tubing in the past for A arms on formula Fords.
They were very light (gave the inspection techs some concern).
I wonder if something like that in Aluminum with Heim joints at the ends would be what you are looking for?
The Heim joints would give you infinite adjustability and good support while allowing some mounting deflection where they mount to the body.
As always Jack...I follow your endevours with anticipation....LOL
Bob
You would not want heim joints on the attachment to the chassis/body as that would decrease the buckling resistance in and of itself. Same goes for the wing attachments but it would make less of a difference since the wing is not grounded but rather connected to the other supports so it can move some.
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1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened

Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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Old 03-18-2012, 09:34 AM
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Brando
 
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Imagine this POS with the racing forces your placing on yours.
I imagine this thing flying apart even on the freeway!! This looks like a serious weapon of another sort.

ebay 260964208222
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Old 03-19-2012, 11:59 AM
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J. Olsen- Congrats on the new lap time, your car is bad ass.
Old 03-19-2012, 12:26 PM
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Now Available for Ordering:   101 Projects For Your BMW 3 Series 1982-2000  [more info]
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Thanks.

Instead of overthinking my too-thin uprights mistake, I think I'm going to see if I can adapt the old, tried-and-true uprights to the new (now-tested, although very briefly) wing.

Cost will be close to zero. Time investment will also be low.

That's 'lazy-man's engineering.'
Old 03-19-2012, 12:42 PM
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Nice build as always

Have you any pictures of the fittings body-upprigts.

Best regards Stefan
Old 03-20-2012, 01:05 AM
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