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Old 08-17-2010, 01:47 PM   #71
kbrownfocus
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Quote:
Originally Posted by illinipo View Post
the knowledge base required for properly doing aero engineering is COMPLETELY different from the knowledge base required for properly designing mechanical parts. As a mechanician with friends in aero engieering, I can assure you that my friends are not qualified to design these arms. (and I also recognize that I cannot design airplanes...)
Im sorry to be blaint, but the materials and the design of these LCA's are designed the same way landing gear for jets and airlines are, they are made as one peice, not tigged together and seamed. Sad thing is its 500% over the stock LCA's witch are weak and just straight junk. and an aero engineer should make these because the simple fact that if it is made the same way landing gear is made then hell a 4000LBS max vehicle realy isnt anything to even put the least amount of stress on the tubing.
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Old 08-17-2010, 04:39 PM   #72
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Hmm, I realize this is probably not the forum to go too deep into the engineering of structures to resist fatigue, but some good points have been raised already. As someone who designs structural parts and machinery I'm concerned regarding the explanation given so far by CFM.

The control arms that failed appeared to do so after less than 4 months of use. That sounds consistent with a low cycle fatigue failure.

The discussion in the other FC thread was that the tube material was out of specification (high carbon instead of whatever grade they used since they are not saying, My guess is the planned to use ASTM A513 1020 or 1026). This would be a plausable reason since trying to use the same weld procedure with a high carbon content steel would cetainly give you very brittle welds prone to cracking and fatigue failure. (This is contrary to the statement made above that it was a "weak spot" in the metal.)


My question is:

If the issue is simply poor quality control at the manufacturer due to incorrectly identifying tubing material, why are CFM requiring gussets be added ? These won't help if the same material identification failure happens again.

So that leaves the question of whether there is some other issue ? Has any FEA and fatigue analysis been done ? Has the weld procedure been reviewed ?

Personally I'd like to see the proposed solution address the original cause of the faulure. Everything else is just fluff.
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Old 08-17-2010, 04:59 PM   #73
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I'd also note that contrary to claims made on the thread:

ASTM A108 1018 is not brittle (actually it's really ductile and easy to successfully weld vs ASTM A513 1020 or 1026).

Both MIG and TIG can have excellent penetration. The issue is careful control of the weld parameters (that's what I employ my welding engineer to determine). The carbon equivalent of the steel is much more of a concern. High carbon equivalents make the tolerance for out of parameter welds smaller. At a carbon equivalent of over 0.5% you are basically assured that your welds will fail.
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Old 06-30-2011, 05:31 PM   #74
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Any one got any pics

Hey just wanted to know if anyone who has been talking about getting these installed on there car have any pictures on what it looks like. Also does it lower the car any I have a Eibach set up and I was just wondering if there was any lowering or tucking that it would do to the tires if installed. I ask because my front 15" tires stick out a little after I got it aligned by a guy at the dealership. He was a little confused on how to adjust camber until I showed him how to adjust under the hood. Sorry its a long statement but I figured since I found this if there was a way to fix this or if it is just something I have to live with. If you guys need pix I can take them and post on the forum of I need to be redirected somewhere else for an answer.
Thanks A lot

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Old 07-01-2011, 07:02 AM   #75
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I have these installed on my 09. Sorry the car is so dirty, these were taken right after winter. These are worth every cent. The have held up very well and cornering is sik!!!
I read through this thread and honestly, some of you guys need to lay off the crack rock.
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Old 07-01-2011, 07:56 AM   #76
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Mine come in today. I couldn't be more excited.
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Old 07-01-2011, 12:19 PM   #77
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oh yeah, whatever happened to the rear control arms you guys were making?
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Old 07-15-2011, 11:21 PM   #78
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I've had my on since 7-10, no problem at all. I used a couple of jam nut's to replace the lock-nut, to make it easier to remove if I have to, & I start out w/ 4.5 turn's out, & that made my camber -1.7 degree's. Lighter weight, more forward bite, adjustable camber= win, win ,win !
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Old 07-17-2011, 02:33 PM   #79
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Interested to see how these hold up in the long term and with some aggressive hard driving. Keep us updated.
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Old 08-12-2011, 09:33 PM   #80
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Make them for the 05s and up yet?
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