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Old 11-07-2019, 11:01 AM   #1
propav8r
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Default Boxing Control Arms...Worth It?

I've got the front and rear control arms off my 240 at the moment, and Yoshi's plates are only about $100 total.

Question for anyone that's done it...has it made a difference in handling or (especially in the back) do you view it more as an insurance policy against bending stuff under power?
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Old 11-07-2019, 11:14 AM   #2
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Just do it. /thread.
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Old 11-07-2019, 11:16 AM   #3
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I have never boxed the stock stuff but I know that putting my stiffer units on was a noticeable improvement so i would assume that boxing the stock stuff would probably be as well.
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Old 11-07-2019, 11:25 AM   #4
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Boxing the back would be nice in conjunction with BNE's Spherical TABs.
As far as the front, if I popped a curb I'd rather replace a control arm than a crossmember or worse.
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Old 11-07-2019, 11:27 AM   #5
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Just do it. /thread.
That's what I needed to hear.
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Old 11-07-2019, 11:31 AM   #6
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Old 11-07-2019, 12:05 PM   #7
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box or fabricate better ones for the rear.
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Old 11-07-2019, 12:07 PM   #8
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https://shop.klracing.se/sv/artiklar...-special-.html
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Old 11-07-2019, 12:19 PM   #9
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I did the front and back with 3/16" plate, overkill but it's what I had on hand. Definitely notice the difference.
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Old 11-07-2019, 12:24 PM   #10
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box or fabricate better ones for the rear.
I'm getting a few clunks out of the rear on mine already. And I already swapped the ovalized and shredded torque rods for IPD's with poly.

I'm guessing when I swap the 8.8 in I'll try to make everything stronger.
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Old 11-07-2019, 12:30 PM   #11
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You can buy sheet metal home at home depot or ace hardware and just trace the pieces and cut them to size. You can make 2 pieces from one piece of sheet metal if you do the yoshifab style. If you do Volvo taxi style plate, it will require 2 pieces of sheet metal(still have to cut to size).
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Old 11-07-2019, 12:43 PM   #12
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When I slid into a curb during a parking lot snow hoon session, the impact to the front wheel bent my stock control arm. Would it have bent the unibody if it was boxed, or just bent up my wheel more?
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Old 11-07-2019, 01:41 PM   #13
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When I slid into a curb during a parking lot snow hoon session, the impact to the front wheel bent my stock control arm. Would it have bent the unibody if it was boxed, or just bent up my wheel more?
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Old 11-07-2019, 03:24 PM   #14
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Originally Posted by tjanson View Post
When I slid into a curb during a parking lot snow hoon session, the impact to the front wheel bent my stock control arm. Would it have bent the unibody if it was boxed, or just bent up my wheel more?
Tis my concern as well
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Old 11-07-2019, 03:25 PM   #15
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Installed a set on my brother's car last weekend.

Nice piece of kit, but no provision for swaybar, if you're in to that kinda thing.
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Old 11-07-2019, 03:27 PM   #16
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Installed a set on my brother's car last weekend.

Nice piece of kit, but no provision for swaybar, if you're in to that kinda thing.
I welded some stock brackets on. Better solution would be to weld some U bolts to the arm and a bracket to a removable piece of bar, as the end links want to be right on top of the ball joint.
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Old 11-07-2019, 03:27 PM   #17
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I generally try to avoid sliding into curbs. Where I'm at, there are precious few curbs anyway. Generally just mountainside dropoffs.
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Old 11-07-2019, 03:52 PM   #18
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The rear ones bend pretty easily. I've bent them before. Now they're boxed.
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Old 11-07-2019, 04:17 PM   #19
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I wonder if the KL racing strut mounts are any good. You could pair them with their control arms for more camber and caster without switching to coilovers for spring clearance.

IF their strut mounts don't self destruct like all other stock replacement strut mounts.

https://shop.klracing.se/sv/artiklar...240-_260-.html
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Old 11-07-2019, 06:52 PM   #20
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I used the Yoshifab pieces.
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Old 11-07-2019, 07:30 PM   #21
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Volvo offers taxi arms from gcp still. They're boxed but have a provision to allow folding. Idk how important folding really is, seeing how the 850 arms are solid steel.

The rears should be stiffer in theory, but will experience a lot more force if you are using poly bushings in the rear
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Old 11-07-2019, 07:41 PM   #22
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Originally Posted by tjanson View Post
I wonder if the KL racing strut mounts are any good. You could pair them with their control arms for more camber and caster without switching to coilovers for spring clearance.
The KL arms and BNE Select strut mounts set to max caster make a 240 handle very very well (1.5deg neg camber and 7deg caster) . They really need delrin bushings front and rear to make them work well under heavy braking.

As far as boxing control arms...
For a DD: no real need unless your running big rubber up front, doing the occasional track day and really using your brakes. I have yet to fold/bend one at track days or drifting.
If your smashing rough roads: definitely box them.
KL Arms: I bent a set at a drift event. They’re now fully boxed, and now it destroys the rear control arm bushings if I hook a wheel on the inside curbing.
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Old 11-07-2019, 07:42 PM   #23
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Quote:
Originally Posted by tjanson View Post
I wonder if the KL racing strut mounts are any good. You could pair them with their control arms for more camber and caster without switching to coilovers for spring clearance.
The KL arms and BNE Select strut mounts set to max caster make a 240 handle very very well (1.5deg neg camber and 7deg caster) . They really need delrin bushings front and rear to make them work well under heavy braking.

As far as boxing control arms...
For a DD: no real need unless your running big rubber up front, doing the occasional track day and really using your brakes. I have yet to fold/bend one at track days or drifting.
If your smashing rough roads: definitely box them.
KL Arms: I bent a set at a drift event. They’re now fully boxed, and now it destroys the rear control arm bushings if I hook a wheel on the inside curbing.

Rear trailing arms should be reinforced if you’re giving it the beans.
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Old 11-07-2019, 08:20 PM   #24
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The KL arms and BNE Select strut mounts set to max caster make a 240 handle very very well (1.5deg neg camber and 7deg caster) . They really need delrin bushings front and rear to make them work well under heavy braking.
My setup. It's so so so so good.
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Old 11-07-2019, 08:38 PM   #25
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Not a direct comparison, but my 142 rear trailing arms were starting to bend a bit. A simple strip of 1/8" steel stitch welded on there stopped the bending.
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