Boxing in upper control arms? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 14 Old 07-14-2009, 05:28 PM Thread Starter
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Boxing in upper control arms?

I've got my new uppers (OEM) to replace the Poly'd ones I have installed on the car now. I've noticed these are kinda flimsy. Is it okay to weld a steel plate over the open side to box them in for strength?


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post #2 of 14 Old 07-14-2009, 06:00 PM
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I think its that "flimsyness" that keeps the rear bind to a minimum in Ford's Quadra-bind suspension.


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post #3 of 14 Old 07-14-2009, 06:33 PM
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whats the deal on the poly'd ones??? i have some i havn't installed yet, is there that much binding and is it noticeable?

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post #4 of 14 Old 07-14-2009, 06:43 PM
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i just built a solid tube arm with a heim joint on one end. otherwise i wouldnt bother. the arm is supposed to flex in that setup.
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post #5 of 14 Old 07-17-2009, 03:37 PM
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Quote:
Originally Posted by Nitrous SSC View Post
I've got my new uppers (OEM) to replace the Poly'd ones I have installed on the car now. I've noticed these are kinda flimsy. Is it okay to weld a steel plate over the open side to box them in for strength?
You'll have basically the a Steeda heady duty uca when you do that.
http://www.steeda.com/products/steed...ntrol_arms.php

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post #6 of 14 Old 07-17-2009, 04:01 PM
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*sigh*

MM Bind study done by Ehren vanSchmus

http://www.2kgt.com/item.php?itemid=77

Don't box the upper control arms or make them "better" with poly bushing inserts or a spherical rod end design, they are "flimsy" by OEM design even if it's very so-so.

Last edited by Moving Target; 07-17-2009 at 04:04 PM.
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post #7 of 14 Old 07-17-2009, 05:21 PM Thread Starter
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Cool write-up. I just don't understand a damn thing it talks about. LOL

My plan is stock uppers, MM adjustble lowers, and PHB, then later a torque arm.

Matt, 90' GT 347, 6037 heads, V1 Si-trim, 11psi, B31 Cam, T56, SV Intake, BE/Tweecer Tuned. 550rwhp 513tq
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post #8 of 14 Old 07-18-2009, 07:59 AM
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Just start putting together a Road & Track box a few pieces at a time.MM will tell you what order to do it in.

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post #9 of 14 Old 07-22-2009, 10:10 AM
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A long time ago somebody had a computer generated picture of a UCA in action. Imagine the axle mount of the upper control arm having a 6" diameter sphere around each mounting point. That mounting axle point will move around in the sphere when the car is turning, body roll, acceleration, etc.. If you weld a brace on the UCA it limits the movement of the axle point creating bind. I thought it was crazy looking seeing some of the video of UCA's while driving around. You can't duplicate it using a jack, because the torsional forces are all over the place.

I always thought the perfect drift suspension for a FOX would be replace all the rear control arms with solid aluminum bushings.
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post #10 of 14 Old 07-23-2009, 09:14 AM
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I boxed mine with a steel plate. I figured that it couldn't hurt. Maybe it did?? Been driving it that way for years.
Jim


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post #11 of 14 Old 07-23-2009, 02:13 PM
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Quote:
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I boxed mine with a steel plate. I figured that it couldn't hurt. Maybe it did?? Been driving it that way for years.
Jim
Check 'em for cracks. The union of the arm and the steel plate makes for an almost ideal stress riser.


Addind stiffness to the UCA's is NOT a wise move. It may improve straight-line traction a little, but it does nothing for handling, and depending on what else you have done to the car, it may make things worse.

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post #12 of 14 Old 07-23-2009, 08:01 PM
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Those steeda boxed uppers used to be ford racing upper control arms, its fine to box them in, I even called ford racing, and if they say so, its fact lol

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post #13 of 14 Old 07-24-2009, 08:12 AM
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Ford Racing probably assumes you are a drag racer.
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post #14 of 14 Old 07-24-2009, 11:12 AM
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Quote:
Originally Posted by wytstang View Post
You'll have basically the a Steeda heady duty uca when you do that.
http://www.steeda.com/products/steed...ntrol_arms.php

Those are what I run with my MM adjustable lowers.

They are cheaper than the OEM Ford upper arms, and are zinced and boxed but still have the rubber bushing in them.

Mike
--1988 Mustang LX 5.0--
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