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Old 01-17-2019, 07:02 AM   #1
MSGGrunt
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Default Yoshifab Reinforcing Plates

In preparation for replacing my front and rear control arms/trailing arms and bushings I ordered a set of Yoshifab's reinforcing plates to strengthen the new pieces. I figued it would be good insurance while everything is apart and clean/new.

My question is regarding welding on the plates. Do I NEED to fully weld the plates on or am I OK to stitch weld them?

https://yoshifab.com/store/
Attached Images
File Type: jpg Front Control Arms.jpg (91.3 KB, 344 views)
File Type: jpg Rear Trailing Arms.jpg (81.9 KB, 344 views)
File Type: jpg 240armbox2.500.jpg (7.6 KB, 344 views)
File Type: jpg 240trailingarmplates.500.jpg (9.1 KB, 343 views)
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Old 01-17-2019, 10:14 AM   #2
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stich welding should be great or that is my plan. my thinking is less chance of moisture to be a problem and these plates will add less chance of any flex. for what i'm doing they are not needed but going on anyway
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Old 01-17-2019, 11:22 AM   #3
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I would stitch weld. Probably on an inch off an inch, give or take. I looked up some old JohnV recommendations for chassis stitch welding and he said 1/2" weld every 1.5".

One reason for stitch welding is so that cracks will not propagate. I think it's a legitimate concern in a control arm. I'm not an engineer.
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Old 01-17-2019, 11:39 AM   #4
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Another vote for stitch welding. I just did my 142 trailing arms that way. Plenty of strength and like towery said, it SEEMS less likely to crack.
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Old 01-17-2019, 12:23 PM   #5
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The volvo part, reinforced control arm:

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Old 01-17-2019, 01:27 PM   #6
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Stitch weld max 1 inch every 2 inches. I am an engineer......
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Old 01-17-2019, 10:38 PM   #7
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Default Why?

O.k., I have a related question - just trying to learn here. I have mine off right now. One, I sandblasted and powder coated, the other I decided to replace with an aftermarket new one.



Why would these plates be necessary? Is this for performance mods?
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Old 01-18-2019, 04:22 PM   #8
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There is flex in the stock suspension arms enough that in a more demanding driving situation it benefits those parts to be reinforced.
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Old 01-18-2019, 05:22 PM   #9
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stitch weld for sure.

You dont need more than 1/2" of weld every 2" they are just there to stiffen the assembly.
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Old 01-22-2019, 09:24 AM   #10
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Stitch welding it will be.
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Old 01-29-2019, 09:40 PM   #11
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Has anyone else on here used Yoshifab's plates? I was kind of surprised at how thin the metal is. Was expecting something a bit more substantial, or do they not need to be that thick? They measure 1.15mm or 3/64th of an inch thick.
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Old 01-29-2019, 09:47 PM   #12
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I had the same concern but its all in they way the control arm flexes, the plates are plenty thick, here's the discussion:

https://forums.tbforums.com/showthread.php?t=346633
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Old 01-30-2019, 09:21 PM   #13
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Thanks 2turbotoys
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Old 01-30-2019, 09:23 PM   #14
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Old 01-31-2019, 12:49 PM   #15
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The YoshiFab plates are fine for rally racing. The only time we had a control arm bend was when the strut broke at 60mph. Can't really blame the control arm for that one.
Trailing arms are still doing great as well. 3-4k miles of gravel rally racing on them, not a single issue.
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Old 02-05-2019, 12:51 AM   #16
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I just ordered up front and rear plates that I plan on using my dimple die set on to lighten and strengthen.
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Old 02-05-2019, 10:27 AM   #17
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Quote:
Originally Posted by 11BC2 View Post
I just ordered up front and rear plates that I plan on using my dimple die set on to lighten and strengthen.
Post pictures when you're done. I was thinking they could benefit from that to reduce weight and further increase rigidity.
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Old 02-06-2019, 06:46 PM   #18
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Quote:
Originally Posted by towerymt View Post
Post pictures when you're done. I was thinking they could benefit from that to reduce weight and further increase rigidity.
The plates showed up today and here are a few pictures.

As received. Needed to enlarge the hole a tad for the die.



My selection of dies.


First hole dimpled.
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Old 02-06-2019, 09:47 PM   #19
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Nice, I was thinking it would be cool to roll a bead through it but have no way to do it.
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