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Old 03-29-2010, 11:09 PM   #1
speedyHAM
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Default Improved strut tower bars :)

Here's mine-







The original STI bar wouldn't fit with the new AWIC, so I fabbed a new one. It weighs 1/2 lb more, but it is much stiffer than the STI bar and it triangulates back to the firewall.
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Old 03-29-2010, 11:58 PM   #2
Deathclutch
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that is awesome! great job.. you have given me a good idea for the one i wanna make
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Old 03-30-2010, 12:11 AM   #3
PARANOID56
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here is one i made for somebody.

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Old 03-30-2010, 12:22 AM   #4
FourOnTheFloor65
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Paranoid56: What did you make that out of? Is it mild steel, chromoly, 304 stainless, or what?
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Old 03-30-2010, 12:51 AM   #5
PARANOID56
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i made it from 120 DOm
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Old 03-30-2010, 01:05 AM   #6
raceckr
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wow sick guys nice job
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Old 03-30-2010, 08:29 PM   #7
fastwrx25
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the bar you made for someone...can you still remove the bar? I see it is welded to the firewall.
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Old 03-30-2010, 08:45 PM   #8
PARANOID56
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you dont see it welded that part bolts to the firewall. so its totally removable
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Old 03-30-2010, 08:51 PM   #9
MConte05
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To the OP, weld the joint to make it functional, like Paranoid's bar!
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Old 04-02-2010, 11:33 PM   #10
speedyHAM
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Quote:
Originally Posted by MConte05 View Post
To the OP, weld the joint to make it functional, like Paranoid's bar!
1. It's pretty hard to weld steel to aluminum.

2. With the bolt torqued appropriately, there isn't any rotation at that joint so welding it solid is unnecessary.
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Old 04-08-2010, 01:31 PM   #11
rexworx
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Great work guys, This is one of the first things I plan to do when I bite the bullet and swap my tnic for my fmic...
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Old 04-09-2010, 04:05 PM   #12
my4isflat
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I made this one for my car.





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Old 04-10-2010, 10:45 PM   #13
speedyHAM
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^^^ I like the ends, looks like some nice precision machining, but why put in the heim joint ends on the links? Solid links would have worked just as well. Granted they would not have looked as nice.
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Old 04-12-2010, 12:11 AM   #14
lettucemanatee
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i've got old GC topmount camber plates, the ones they're selling as rally spec on their site now, look like:

as you can see, there are already 2 points on them tapped for a strut bar. GC never released one and i'm interested in making one to tie in the middle against the firewall and also clear a larger TMIC.

any tips? sources to get threaded fittings for pre-tension?
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Old 04-12-2010, 12:30 PM   #15
Legacy777
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Personally, I would recommend against tieing the strut tower bars back to the firewall. It was not meant to be a load bearing in the vertical (front to back) direction, so it's not going to give you any additional strength by triangulating back to it.
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Old 04-13-2010, 12:09 AM   #16
speedyHAM
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Quote:
Originally Posted by Legacy777 View Post
Personally, I would recommend against tieing the strut tower bars back to the firewall. It was not meant to be a load bearing in the vertical (front to back) direction, so it's not going to give you any additional strength by triangulating back to it.
The engine pitch mount is tied into the firewall just below where my bar is bolted in. That pitch mount loads the firewall much more than the strut tower bar ever will.

The firewall at that location is actually pretty strong and stiff in the fore-aft direction and contributes quite a bit to the stiffness of the chassis by tying the strut tower bar into that location.
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Old 04-13-2010, 02:38 AM   #17
Deuce Cam
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The Litchfield type 25 race car has a custom triangulated weld-in strut bar connecting the strut towers and firewall - much like bars pictured above, but more affective. I couldn't find a good pic.
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Old 04-15-2010, 04:00 AM   #18
my4isflat
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Quote:
Originally Posted by speedyHAM View Post
^^^ I like the ends, looks like some nice precision machining, but why put in the heim joint ends on the links? Solid links would have worked just as well. Granted they would not have looked as nice.
Thanks. I use the heim's for three reasons. The first being I just like the look, and the second I can set the preload on the brace, and the third being it provides a cleaner install. When you say solid links do you mean solid rod ends vs. spherical endlinks. The reason I can't use solid links is the bracket on top of the pitchstop mount would be to large to mount. The heim's allow for the misalignment on the pitchstop bracket. If the strut tower brackets and the pitchstop bracket were on the same plane for the mounting holes then the width of the bracket would prevent a clean install, and I couldn't get my torque box back on.

Quote:
Originally Posted by speedyHAM View Post
The engine pitch mount is tied into the firewall just below where my bar is bolted in. That pitch mount loads the firewall much more than the strut tower bar ever will.

The firewall at that location is actually pretty strong and stiff in the fore-aft direction and contributes quite a bit to the stiffness of the chassis by tying the strut tower bar into that location.
I just wanted to add the pitchstop mount is also right above the trans. tunnel too. This area of the chassis is quite possibly the stongest, most ridged area of the chassis.
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Old 01-08-2017, 01:58 AM   #19
fstmodifieds
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Quote:
Originally Posted by PARANOID56 View Post
here is one i made for somebody.

Wow looks really nice,looks simular to my old autoselect brace on my old car before trading to a subie
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Old 01-30-2017, 09:48 AM   #20
danscomp
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See some really cool stuff in here, but considering that our strut towers are tied into the firewall already, is there any real benefit of doing this? Everything I've seen suggests otherwise
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Old 01-30-2017, 04:23 PM   #21
rtv900
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I've always wondered if they do anything or if the body is designed well enough these days that it won't flex anyhow.

A cool experiment would be to make a strut brace with an intentionally placed weak link at the center and see if it breaks under hard cornering
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Old 01-31-2017, 09:17 PM   #22
dangerousatom
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Rear 02-04 Wagon C-D pillar bar setup:






The C-D bar build:

https://forums.nasioc.com/forums/sho...ighlight=wagon
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Old 02-03-2017, 04:24 PM   #23
Charlie-III
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Quote:
Originally Posted by danscomp View Post
See some really cool stuff in here, but considering that our strut towers are tied into the firewall already, is there any real benefit of doing this? Everything I've seen suggests otherwise
Likely correct, minimal gain. My 98 Legacy has enough space to put my fist between the rear of the tower and the firewall, newer Subarus have little to no space.
It won't hurt to use a strut brace, but on street tires the gain is smaller.
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Old 02-07-2017, 10:38 AM   #24
Patrick Olsen
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Quote:
Originally Posted by rtv900 View Post
I've always wondered if they do anything or if the body is designed well enough these days that it won't flex anyhow.
As Charlie's post points out, the return on investment definitely decreases as you get newer and newer chassis that are already significantly more rigid. On older 1st and 2nd gen cars, in which the strut towers are not tied into the firewall, there's more to be gained.
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Old 03-07-2017, 09:12 AM   #25
FR50089
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Paranoid56 that is a killer looking strut brace. I love seeing people fab up their own parts.
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