Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

3 Pages V  1 2 3 >  
 Reply to this topicStart new topic
> How much stiffer with solid or tied in roof?
Mueller
post Dec 12 2004, 11:17 AM
Post #1


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??
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Dec 12 2004, 11:34 AM
Post #2


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
An X brace would help alot to stiffen things up, but how stiff is the windshield frame anyway?

Geoff
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
neo914-6
post Dec 12 2004, 11:45 AM
Post #3


neo life
*****

Group: Members
Posts: 5,086
Joined: 16-January 03
From: Willow Glen (San Jose)
Member No.: 159
Mike,
Don't have historical data on the 916 but I plan to use engman's lower bracing if I don't use a cage. Here's a hack solution! (IMG:style_emoticons/default/laugh.gif)
Felix


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GWN7
post Dec 12 2004, 11:45 AM
Post #4


King of Road Trips
*****

Group: Members
Posts: 6,280
Joined: 31-December 02
From: Winnipeg, MB, Canada
Member No.: 56
Region Association: Northstar Region
I saw this on one car. Don't know how functional it would be.

LOL same pic (IMG:style_emoticons/default/biggrin.gif)

This post has been edited by GWN7: Dec 12 2004, 11:47 AM


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
neo914-6
post Dec 12 2004, 11:47 AM
Post #5


neo life
*****

Group: Members
Posts: 5,086
Joined: 16-January 03
From: Willow Glen (San Jose)
Member No.: 159
(IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/laugh.gif) (IMG:style_emoticons/default/laugh.gif)
And this is on an original 914-6 currently at ~600 on eBay!
Felix
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
airsix
post Dec 12 2004, 01:07 PM
Post #6


I have bees in my epiglotis
****

Group: Members
Posts: 2,196
Joined: 7-February 03
From: Kennewick Man (E. WA State)
Member No.: 266
Mike,
It's so funny to ready your threads like this becuase you usually post about something that I'm actually scratching my own chin about. I've thought about doing a cross-brace like this myself. I was thinking about maybe doing a box-steel 'X' of light-guage steel and glassing it into the undersid of the roof. Then tie it in to the targa bar and windshield frame w/ removable plates.

Now that I've got a new daily driver I'm just going to do a cage though.

-Ben
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ein 6er
post Dec 12 2004, 01:24 PM
Post #7


Senior Member
***

Group: Benefactors
Posts: 1,115
Joined: 11-February 03
Member No.: 300
Region Association: None
this is the brumos gt
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ein 6er
post Dec 12 2004, 01:24 PM
Post #8


Senior Member
***

Group: Benefactors
Posts: 1,115
Joined: 11-February 03
Member No.: 300
Region Association: None
front
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ein 6er
post Dec 12 2004, 01:25 PM
Post #9


Senior Member
***

Group: Benefactors
Posts: 1,115
Joined: 11-February 03
Member No.: 300
Region Association: None
back
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
michel richard
post Dec 12 2004, 01:42 PM
Post #10


Senior Member
***

Group: Members
Posts: 1,291
Joined: 22-July 03
From: Longueuil, Québec
Member No.: 936
I thought I read somewhere that the 914, new and un-rusty, was designed to be just as stiff as a 911 coupe. Has anyboldy else heard of this ?

Michel Richard
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
campbellcj
post Dec 12 2004, 01:48 PM
Post #11


I can't Re Member
****

Group: Members
Posts: 4,544
Joined: 26-December 02
From: Agoura, CA
Member No.: 21
Region Association: Southern California
I know even with an 8-point welded cage, the tub still has "some" flex, because I have a skin targa top attached with dzus fasteners and it squeeks and rattles quite bit. That tells me there's a little motion going on. I figure it's the A-pillar (windshield frame) since the cage is tied into the targa bar. The A-pillar on any roofless car or even a sunroof car is inherently gonna flex.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bleyseng
post Dec 12 2004, 01:49 PM
Post #12


Aircooled Baby!
**********

Group: Members
Posts: 13,034
Joined: 27-December 02
From: Seattle, Washington (for now)
Member No.: 24
Region Association: Pacific Northwest
Maybe 911 Targa.......
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
sixnotfour
post Dec 12 2004, 02:22 PM
Post #13


914 Wizard
**********

Group: Members
Posts: 10,430
Joined: 12-September 04
From: Life Elevated..planet UT.
Member No.: 2,744
Region Association: Rocky Mountains
On the 914-6Gt pages the Gt in the Collier collection shows a picture of a reinforcing plate added at the base of the windshield frame. along with the bolted X-braced Gt top.
The factory must thought it would help ?
new car and the wheels are turnin already (IMG:style_emoticons/default/cool.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jeroen
post Dec 12 2004, 02:24 PM
Post #14


914 Guru
*****

Group: Members
Posts: 7,887
Joined: 24-December 02
From: The Netherlands
Member No.: 3
Region Association: Europe
Like Geoff already mentioned, the windshield frame is pretty weak
The first factory race cars cracked their windshields because of the reinforced roofs
Later they also reinforced the pilars of the windshield frame

So... get Engman's kit and be done with it...
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
airsix
post Dec 13 2004, 01:42 PM
Post #15


I have bees in my epiglotis
****

Group: Members
Posts: 2,196
Joined: 7-February 03
From: Kennewick Man (E. WA State)
Member No.: 266
QUOTE(ein 6er @ Dec 12 2004, 11:24 AM)
this is the brumos gt

Cool. That's almost exactly what I was talking about. I expected the cross-brace to be lighter and the tie-ins to be beefier, but that's the general idea I was talking about.

-Ben M.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Dec 13 2004, 07:36 PM
Post #16


PMB Performance
***************

Group: Admin
Posts: 19,275
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
I've "heard" they're much stiffer.

Troy put the A-Pillar mod on Gint's car. Came out awesome. These things crack a-pillars, especially when autocrossed or raced.

When I restored my 911 the a-pillars were cracked. The factory did the reinforcement to prevent cracking. A-pillars are weak, weak, weak.

Here's a couple of pictures that Andy came over and took... (IMG:style_emoticons/default/laugh.gif) (actually, the camera was pointed directly at the light so it didn't like to focus properly.)


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Eric_Shea
post Dec 13 2004, 07:37 PM
Post #17


PMB Performance
***************

Group: Admin
Posts: 19,275
Joined: 3-September 03
From: Salt Lake City, UT
Member No.: 1,110
Region Association: Rocky Mountains
nudder


Attached image(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Flat VW
post Dec 13 2004, 08:52 PM
Post #18


Illegal Soapbox Derby Racecar
***

Group: Members
Posts: 1,692
Joined: 13-November 04
From: Phoenix, AZ
Member No.: 3,105
Never push the car from the a pillars, I have my two boys, my wife and most of my friends "trained" by now! (IMG:style_emoticons/default/chairfall.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Slowpoke
post Dec 13 2004, 09:19 PM
Post #19


Member
**

Group: Members
Posts: 116
Joined: 1-June 03
From: Tucson, AZ
Member No.: 768
I usually drill some holes in A-pillars and shoot in some expanding hard foam insulation. Not the home depot crap. But, the commerical stuff. Underneath the weather strip area and behind the A-post trim gets it in all the voids. It seems to add some strenght to the A-pillars and cowl area. Some cheaters back in the old days use to shoot foam into the sills, A-post and frame rails on some cars to strenghten the car a little. Not me, but other cheaters. (IMG:style_emoticons/default/wink.gif) Undercoating usually did a good job at hiding it under the car. At least that's what I heard. (IMG:style_emoticons/default/unsure.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Brett W
post Dec 13 2004, 09:58 PM
Post #20


Advanced Member
****

Group: Members
Posts: 2,856
Joined: 17-September 03
From: huntsville, al
Member No.: 1,169
Region Association: None
If you add steel into the top you are hanging some major wieght up high in the chassis. It will have an affect on how the car feels. I think you would be better off laminating the stock top with some sort or honeycomb material and fiberglass. Anything you could do to make it stiffer with out using the steel the better.

The two part expanding foam works well. I know Ford is using it in some of its new vehicles. Make sure the chassis has no rust in the frame rails. Then fill with a commercial two part expanding foam. This will do wonders for the frequency of the chassis.

Engmans kit is a great addition for the average joe. Most cages that are put in cars only add weight and safety. Hopefully when I get some time after the first of the year I am going to be doing some torsional testing on my chassis. I just have to finish the chassis jig first.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

3 Pages V  1 2 3 >
Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 13th May 2024 - 03:53 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...