 Suspension Setup and Cages?????, at what point do you NEED a cage, or not |
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| Mueller |
 Jun 15 2004, 09:23 PM
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#1
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914 Freak!  Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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I've been reading all the suspension improvments that Trekkor has been doing, the car is getting stiffer/stronger parts on it, but how much more effective would all these parts be if a cage was installed?
has anyone done back to back testing without and then with a cage with no other changes??? |
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Replies(40 - 43)
| machina |
Jun 21 2004, 12:11 PM
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#41
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Advanced Member Group: Benefactors Posts: 2,030 Joined: 21-June 03 From: Miami Beach, FL Member No.: 848  |
I think that the rear tubes are optional anyway on cars with our layout. Many I have seen do not run any rear bars. I have not had a problem with SCCA scrutineer or yearly tech yet.
Guess I could hack them out if I had to. (IMG:style_emoticons/default/sawzall-smiley.gif) dr |
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| groot |
Jun 21 2004, 01:01 PM
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#42
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
There are some other rules in that section that apply to all cars that aren't well known.
For example: Main hoop: 4 bends maximum, totaling 180 degrees, +- 10 degrees and Front hoop: 4 bends maximum, or front downtubes, 2 bends maximum. There is a "get out of jail" card that says you can use tubing the next size up if you don't meet the requirements. I think there are some scrutineers that don't know this section well enough. BTW... if you're talking production, those tubes are not optional. |
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| Brett W |
Jun 21 2004, 04:39 PM
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#43
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None
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When does a car need a roll cage?
When it leaves the showroom! If you want the maximum in suspension accuracy then the chassis needs to be built with the maximum stiffness. We did a car awhile back that used 1 3/4 .095 instead of 1.5 figuring the trade off in stiffness would be worth the wieght. I really don't think is was. The problem with most cages available for the 914 on the market, (Autopower, Etc) don't address the stiffening issue they just add a measure of safety. A good cage should incorporate the whole suspension, chassis and body. Tubes in the right place can make a difference, where just adding a bunch of tubes can just add wieght. I would love to run a scale model of the 914 chassis through an FEA program but I don't know How to get the measurements without a CMM. |
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| Trekkor |
Jun 21 2004, 05:39 PM
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#44
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I do things... Group: Members Posts: 7,809 Joined: 2-December 03 From: Napa, Ca Member No.: 1,413 Region Association: Northern California |
Just installed the interior longs chassis stiffening plates today.
I can already feel the differance. But I haven't really *tested* it yet. |
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