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Old 04-02-2009, 02:47 AM   #1
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At Risk of a LCA Break?

Am I at risk? I've read a few other threads on the subject but I wanted to ask directly.

I have an Eibach Pro System Plus which is Eibach Pro Dampers, Eibach Pro Kit Springs (1.5"F, 1.4"B) and a Eibach Rear Sway Bar.

I've heard that soft springs plus a rear sway can lead to a passenger side lower control arm break.

Any input would be appreciated.

As I do more canyons runs and am about to get into AutoX I need to know.


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Old 04-02-2009, 08:38 AM   #2
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From what I've heard the only time they break is with the REAL BIG rear sways like the 28.6mm. The ones that get sent in a set from Eibach are I think 25mm so you should be all good.
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Old 04-02-2009, 09:48 AM   #3
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I run the 28.6mm and SVT suspension, I have not had any problems. Years ago people said that the 25mm would cause LCAs to break. You can't believe everything you read on the internet.
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Old 04-02-2009, 10:05 AM   #4
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Soft springs with a big bar can cause a LCA to break... The SVT LCA has brackets welded into it that provide much needed structural integrity when running the Steeda 28.6mm rear sway bar.
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Old 04-02-2009, 10:38 AM   #5
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I would at least check the LCA's for cracks a few times a year. I doubt they break all at once. It might depend how rough your roads are also. My GUESS is that you will be fine.
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Old 04-02-2009, 12:43 PM   #6
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It really depends on how agressive a driver you are. Normal street driving is unlikely to do anything as you are not stressing the control arms. Remember the sway applies more force as more weight is put on one side or the other. Cornering speed, weight transfer, and gravity (g-forces) are what makes the bar work harder. The bar then transfers this forces to the control arms. On occasion they have proven to be the weak link. If you autocross or track your car you may want to think about reinforcing it especially if you're using larger bars.
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Old 04-02-2009, 03:10 PM   #7
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HOW TO: Reinforce your Rear Lower Control Arms.
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Old 04-02-2009, 03:16 PM   #8
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Eh I am riding on SVT springs/dampers with a 25mm bar in the back for around a year now. No stress fractures on the LCA's yet. I don't drive like an insane person though.
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Old 04-02-2009, 06:04 PM   #9
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Quote:
Originally Posted by jetrinka View Post
Eh I am riding on SVT springs/dampers with a 25mm bar in the back for around a year now. No stress fractures on the LCA's yet. I don't drive like an insane person though.
Quote:
Originally Posted by Red_Zeppelin View Post
From what I've heard the only time they break is with the REAL BIG rear sways like the 28.6mm. The ones that get sent in a set from Eibach are I think 25mm so you should be all good.
Quote:
Originally Posted by zantar View Post
I run the 28.6mm and SVT suspension, I have not had any problems. Years ago people said that the 25mm would cause LCAs to break. You can't believe everything you read on the internet.
You dont have drive like an insane person to brake one of these arms. I dont care what anyone says, ANY thing over 25mm your taking a risk with the LCA's breaking or haveing the welded mount rip out of the frame.

this is from FJ.com



this is what happen's when you dont renforce the frame for the 28.6



If you are conserned about your LCA's breaking i have a set for sale that i renforced.
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Old 04-02-2009, 06:12 PM   #10
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What kind of front swaybar were these two examples running by chance? I seriously doubt if they were running a larger front swaybar in addition to the big rear this would have happened. The Focus chassis is extremely stiff. Just yesterday I jacked it up pretty darn high behind the front passenger wheel. Had 3 wheels off the ground. If you are using a big rear bar with the stocker front bar that rear bar is going to have to compensate for a lot of the lacking on the heavier end of the car, hence breaking these arms.

I am willing to bet the guy in the first pic has the Eibach front sway (22mm) as well judging from the rear sway and spring colors. With the stock weight distribution of the Focus I really feel like a bigger front bar than 22 is needed to keep that rear one in check. Sure it may rotate nice and feel great but the amount of stress being put on that rear bar is just immense as it tries to make up for what is lacking up front.
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