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
> I broke a rear trailing arm at the track!, Holy Cow!
Matt Romanowski
post Jul 18 2017, 06:42 PM
Post #1


Senior Member
***

Group: Members
Posts: 878
Joined: 4-January 04
From: Manchester, NH
Member No.: 1,507



I was at Mont Tremblant this weekend with my track car. It's got a stock 3 liter, 915 with Martin's shift conversion, great suspension setup. Weights around 2000 lbs. I came in from a run and the right rear tire had WAY too much camber. It was obvious it was broken and about to rain, so we loaded up and waited for the complete diagnosis for when we got home. Put it on the lift to find the rear control arm coming apart. I'll post up more photos and analysis when I get the arm off, but wanted to share these.

Attached Image
Attached Image
Attached Image
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Porschef
post Jul 18 2017, 06:53 PM
Post #2


How you doin'
****

Group: Members
Posts: 2,162
Joined: 7-September 10
From: LawnGuyland
Member No.: 12,152
Region Association: North East States



Dahaaamn! Must be a beast.

I believe Mr. Foley has what you need.

Thanks for sharing

What's that welded carabiner looking thingy?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
PanelBilly
post Jul 18 2017, 06:57 PM
Post #3


914 Guru
*****

Group: Members
Posts: 5,788
Joined: 23-July 06
From: Kent, Wa
Member No.: 6,488
Region Association: Pacific Northwest



Would that be the result of driving all out. I'd say you were pushing it to the limit.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
trojanhorsepower
post Jul 18 2017, 06:59 PM
Post #4


Senior Member
***

Group: Members
Posts: 861
Joined: 21-September 03
From: Marion, NC
Member No.: 1,179
Region Association: None



QUOTE(Porschef @ Jul 18 2017, 08:53 PM) *

Dahaaamn! Must be a beast.

I believe Mr. Foley has what you need.

Thanks for sharing

What's that welded carabiner looking thingy?


ooh can I guess?

Tie down?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
burton73
post Jul 18 2017, 06:59 PM
Post #5


burton73
****

Group: Members
Posts: 3,457
Joined: 2-January 07
From: Los Angeles
Member No.: 7,414
Region Association: Southern California



I have never seen that. The good news is your OK because it could have been bad.

What it that you have welded to the bottom that looks like a locking oval some people use for key chains or backpacking.

Bob B
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Krieger
post Jul 18 2017, 07:01 PM
Post #6


Advanced Member
****

Group: Members
Posts: 4,685
Joined: 24-May 04
From: Santa Rosa CA
Member No.: 2,104
Region Association: None



Holy crap!
User is online!Profile CardPM
Go to the top of the page
+Quote Post
banananose914
post Jul 18 2017, 07:06 PM
Post #7


Member
**

Group: Members
Posts: 234
Joined: 20-November 13
From: california
Member No.: 16,681
Region Association: None



That is definitely an eyebrow raiser!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cracker
post Jul 18 2017, 07:16 PM
Post #8


Advanced Member
****

Group: Members
Posts: 2,148
Joined: 2-February 10
From: Atlanta (area)
Member No.: 11,316
Region Association: South East States



Are your arms reinforced - I couldn't tell from the pictures. If they are, which ones or method (so we don't use them!)? Thankful it didn't cause a crash...

It really is not surprising given the fact the components on our cars are so old - really curious to know if improvements had been made...

Tony
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Garland
post Jul 18 2017, 07:20 PM
Post #9


Restoration Fanatic
***

Group: Members
Posts: 1,325
Joined: 8-January 04
From: ......Michigan......
Member No.: 1,535
Region Association: Upper MidWest



Is that ring used for a tie down?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Racer
post Jul 18 2017, 07:22 PM
Post #10


Senior Member
***

Group: Members
Posts: 787
Joined: 25-August 03
From: Northern Virginia
Member No.: 1,073
Region Association: MidAtlantic Region



Usually they tear at the other end. Guess those sticky hoosiers are putting a lot of force through there. Does beg the question on your re-inforcement choice or how you will reinforce moving forward.

Glad it didn't end with a hit on a wall. Tremblant is such a fun track!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Bartlett 914
post Jul 18 2017, 08:00 PM
Post #11


Advanced Member
****

Group: Members
Posts: 2,213
Joined: 30-August 05
From: South Elgin IL
Member No.: 4,707
Region Association: Upper MidWest



Wow that is incredible.. I think it has been cracked along the top for awhile. The break is not as clean looking
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
rgalla9146
post Jul 18 2017, 08:08 PM
Post #12


Advanced Member
****

Group: Members
Posts: 4,538
Joined: 23-November 05
From: Paramus NJ
Member No.: 5,176
Region Association: None



What is the rating of those springs ?

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Matt Romanowski
post Jul 18 2017, 08:12 PM
Post #13


Senior Member
***

Group: Members
Posts: 878
Joined: 4-January 04
From: Manchester, NH
Member No.: 1,507



QUOTE(rgalla9146 @ Jul 18 2017, 06:08 PM) *

What is the rating of those springs ?


375 lb.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
porschetub
post Jul 18 2017, 08:15 PM
Post #14


Advanced Member
****

Group: Members
Posts: 4,695
Joined: 25-July 15
From: New Zealand
Member No.: 18,995
Region Association: None



To much glue on the road and rock hard suspension...... (IMG:style_emoticons/default/idea.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Matt Romanowski
post Jul 18 2017, 08:18 PM
Post #15


Senior Member
***

Group: Members
Posts: 878
Joined: 4-January 04
From: Manchester, NH
Member No.: 1,507



The rings are for tie downs. I'm too cheap to buy something special, so I welded those on and the straps grab them.

I haven't run Hoosiers on this car in a long time. Our normal tire is the Nitto NTO1. We just bolted on a set of Hancooks.

The arms were not reinforced. The previous owner, about 11 years ago, had bought these refinished arms (powdercoated, bushings, new bearings). We changed them to Chris' delrin bushings a few years ago (they are way better than the rubber ones).

I've already been in touch with Chris. The car will end up with a set of his arms.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Matt Romanowski
post Jul 18 2017, 08:19 PM
Post #16


Senior Member
***

Group: Members
Posts: 878
Joined: 4-January 04
From: Manchester, NH
Member No.: 1,507



QUOTE(porschetub @ Jul 18 2017, 06:15 PM) *

To much glue on the road and rock hard suspension...... (IMG:style_emoticons/default/idea.gif)


Or 41+ year old parts? I have full data in the car (oil temp, pressure, driver inputs, brake temps, tire temps, and shock travel). The suspension moves plenty. If it was any softer it would bottom out.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cracker
post Jul 18 2017, 08:33 PM
Post #17


Advanced Member
****

Group: Members
Posts: 2,148
Joined: 2-February 10
From: Atlanta (area)
Member No.: 11,316
Region Association: South East States



Matt - Again, very glad it cause an off...do you have a cage? Will you share any pictures
of the car? Chris will get you going and safe the next time you hit the track!

Tony
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Matt Romanowski
post Jul 18 2017, 08:49 PM
Post #18


Senior Member
***

Group: Members
Posts: 878
Joined: 4-January 04
From: Manchester, NH
Member No.: 1,507



It's a full race car. Cage tied to the suspension mounts, NASCAR bars, etc. We have a Kirkey seat, 6 point harnesses, etc. It's a safe car and has all the goodies.

I don't have any photos of the cage, interior, or trunks, but this is the car at Tremblant a couple of years ago.

Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Cracker
post Jul 18 2017, 09:00 PM
Post #19


Advanced Member
****

Group: Members
Posts: 2,148
Joined: 2-February 10
From: Atlanta (area)
Member No.: 11,316
Region Association: South East States



Thanks. Beautiful car Matt.

T
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Mark Henry
post Jul 18 2017, 09:19 PM
Post #20


that's what I do!
***************

Group: Members
Posts: 20,065
Joined: 27-December 02
From: Port Hope, Ontario
Member No.: 26
Region Association: Canada



Matt do you ever go to Mosport, now called Canadian Tire Motorsport park?

If you do drop in, I'm only about 5 miles off the highway on the way there.
I live about 25 minutes from Mosport.
(IMG:style_emoticons/default/beerchug.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post

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:

 



- Lo-Fi Version Time is now: 28th March 2024 - 11:31 AM