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Suspension theory time for the Baja. Trailing arm links?

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Old 04-21-2017, 09:14 PM
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Default Suspension theory time for the Baja. Trailing arm links?

This tends to be one of the more technical forums I'm on. Most of the knowledgeable Subaru people have disappeared into a vape cloud....

I'm attempting to lift my Baja, the subaru truck looking thing, by ~3-4in. General consensus is that after 1in you need to run subframe spacers because the geometry goes all wacky. Vendors make kits, etc. Subframe spacers kinda eliminate the benefits of lifting the truck...

The only snag I've run into so far is the rear suspension has toe issues when lifting it up. It gets more toe in the farther it up it's lifted. At 1-2in the alignment bolt might be able to take care of it, but IDK about 3-4in.


Here are a few images I've borrowed showing how it's setup
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Old 04-21-2017, 09:15 PM
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The problem seems to be with the lower most link, It's stupidly short and already at a sever angle at the stock ride hight. The easy thing to do is to cut it and make it longer, it's just a piece of stamped steel.

The 3rd picture is about where mine sits stock because of the higher factory ride hight.

My question is, most trailing arm setups only have 2 links to triangulate everything. WTF is the 3rd one doing and is it even needed?
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Old 04-22-2017, 12:16 AM
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Two links only stabilize in two directions. Three handle 4 directions of movement. I have built a lot of suspension set ups for off road. You have a project on your hands, that is te most fucked up trailing link Ive ever seen.
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Old 04-22-2017, 12:49 AM
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I have such a soft spot for the utterly ridiculous turbo bajas. Not sure if yours is one or not, but it's still awesome!

Looking forward to seeing how this goes!
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Old 04-22-2017, 08:26 AM
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Originally Posted by ryansmoneypit
Two links only stabilize in two directions. Three handle 4 directions of movement. I have built a lot of suspension set ups for off road. You have a project on your hands, that is te most fucked up trailing link Ive ever seen.
Shouldn't the front bushing in the trailing arm take care if the 4th direction?

I can't find another example of a trailing arm that uses 3 links+ arm on it. SideXside ATVs all use trailing arms and 2 links. The C3 corvette used trailing arms 1 link and a torsion beam. etc
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Old 04-22-2017, 09:01 PM
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Wtf does that rear link even do? It looks like the pivot is in line with the trailing arm pushing so all it does it a whole lot of dick. It reminds me of the saturn rear suspension where as far as I can tell, it had too many links to actually work if you put sphericals in it and they kind of had to add an arm late in development when what they had initially wasnt strong enough. I think if you beef everything up, including the lower link mounting tabs and put sphericals in every thing you can get rid of the rear arm and everything will make sense.
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Old 04-22-2017, 11:31 PM
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The rear most link has the toe adjustment cams on it.

I ran into a snag where the CVs bottom out on the rear diff before getting to my desired droop level. I never got to fixing the suspension issues today. I need to franken together some CVs.
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