I broke a rear trailing arm at the track!, Holy Cow! |
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I broke a rear trailing arm at the track!, Holy Cow! |
Matt Romanowski |
Jul 18 2017, 06:42 PM
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#1
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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.
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Porschef |
Jul 18 2017, 06:53 PM
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#2
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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? |
PanelBilly |
Jul 18 2017, 06:57 PM
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#3
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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.
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trojanhorsepower |
Jul 18 2017, 06:59 PM
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#4
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Senior Member Group: Members Posts: 861 Joined: 21-September 03 From: Marion, NC Member No.: 1,179 Region Association: None |
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burton73 |
Jul 18 2017, 06:59 PM
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#5
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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 |
Krieger |
Jul 18 2017, 07:01 PM
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#6
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Advanced Member Group: Members Posts: 4,685 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None |
Holy crap!
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banananose914 |
Jul 18 2017, 07:06 PM
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#7
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Member Group: Members Posts: 234 Joined: 20-November 13 From: california Member No.: 16,681 Region Association: None |
That is definitely an eyebrow raiser!
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Cracker |
Jul 18 2017, 07:16 PM
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#8
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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 |
Garland |
Jul 18 2017, 07:20 PM
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#9
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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?
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Racer |
Jul 18 2017, 07:22 PM
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#10
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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! |
Bartlett 914 |
Jul 18 2017, 08:00 PM
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#11
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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
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rgalla9146 |
Jul 18 2017, 08:08 PM
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#12
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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 ?
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Matt Romanowski |
Jul 18 2017, 08:12 PM
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#13
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
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porschetub |
Jul 18 2017, 08:15 PM
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#14
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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)
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Matt Romanowski |
Jul 18 2017, 08:18 PM
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#15
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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. |
Matt Romanowski |
Jul 18 2017, 08:19 PM
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#16
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
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. |
Cracker |
Jul 18 2017, 08:33 PM
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#17
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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 |
Matt Romanowski |
Jul 18 2017, 08:49 PM
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#18
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Senior Member Group: Members Posts: 878 Joined: 4-January 04 From: Manchester, NH Member No.: 1,507 |
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Cracker |
Jul 18 2017, 09:00 PM
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#19
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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 |
Mark Henry |
Jul 18 2017, 09:19 PM
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#20
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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) |
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