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Old 04-21-2010, 09:14 PM   #1
Hurley
 
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4-link design & tuning: 2wd trucks

Can we get a discussion going about 4-link design?

In 2008 I back-halfed my truck with DOM tube and put together a 4-link setup with 6" travel coilovers. I will admit my design was a "first timer's" attempt using the 4-link calculator found on some of the 4x4 forums. It has proven worthy on the street, but I am curious as to it's performance when i throw a pair of slicks on it and get some power going to them.

I have included the info I *estimated* for my original calculation for roll center, anti-squat, etc.


The calculated results:
97% anti-squat
19" Roll-center height
8deg roll axis angle (oversteer)
Attached Images
File Type: jpg 4-link 4-21-10.jpg (70.6 KB, 124 views)
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Old 04-22-2010, 01:17 AM   #2
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I have nothing to contribute, but I am hoping this discussion goes some where, I'd like to 4-link my dually in the future.
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Old 04-22-2010, 07:14 AM   #3
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I will add this, my original design intent was to obtain 100% AS, but now I am wondering if that value is too high.

I have considered experimenting with lowering the axle end of the upper links 2" (i.e. drill through the link brackets and re-bolt), probably going to try that. the link calculator says anti-squat will decrease to ~75%, and the roll center increase to 20"
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95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989

03 RCLB 4x4, SSR
 
Old 04-22-2010, 12:26 PM   #4
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so you're running a forward triangulated 4 link i guess?

i wish i knew how to read that thing lol.
 
Old 04-22-2010, 12:50 PM   #5
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Uppers converge on the frame side, lowers are parallel to each other. The diagram shows the suspension at the intended ride height.
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95 2500 RCSB 2wd back-halfed and 4-linked
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539/989

03 RCLB 4x4, SSR
 
Old 04-22-2010, 11:19 PM   #6
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OK
its simple to do it , and it takes a life time of racing to understand it

you need scales first.
 
Old 04-23-2010, 01:41 AM   #7
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Scales or worthless, unless you run some dumb comp car or bracket lapper but probly still not needed.
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Old 04-23-2010, 08:03 AM   #8
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Quote:
Originally Posted by COMP461 View Post
OK
its simple to do it , and it takes a life time of racing to understand it

you need scales first.

I'm all ears (that short post aint your style Comp )
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THIS
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95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989

03 RCLB 4x4, SSR
 
Old 04-23-2010, 04:36 PM   #9
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Once you corner scale it, I think your estimate for CG height will change to 25-26" but there's no way to know until you scale it.
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Old 04-23-2010, 08:59 PM   #10
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^good to know.
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THIS
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COMPD.

95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989

03 RCLB 4x4, SSR
 
Old 04-23-2010, 10:56 PM   #11
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Can you explain what the scales are/do?
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Old 04-24-2010, 12:49 AM   #12
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they allow you to balance you vehicle on all 4 tires via the adjustable 4 link. you weight jack the vehicle to find a balance that works for the car. every car is different. that's why those weld in 4 link kits have 20 holes in the brackets. so you can adjust every aspect of the rear end, to make it hook better on launch, to make it drive straight on the track, to lift the front, to plant the back. there is a lot to it... and to be honest i haven't even played with one yet.
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Old 04-24-2010, 01:27 AM   #13
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Quote:
Originally Posted by SMOKIN93 View Post
Scales or worthless, unless you run some dumb comp car or bracket lapper but probly still not needed.
lol, ignorant
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that's pretty much all of it
 
Old 04-24-2010, 11:15 AM   #14
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Interesting. I'm watching this one.
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Old 04-24-2010, 03:25 PM   #15
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We have an awesome alignment shop around here local that can set one up perfectly everytime, I imagine you could find one locally there as well.
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Old 04-27-2010, 12:46 AM   #16
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Just set the record over the weekend for the fastest converter driven pro mod, 6.04 242, never been on a set of scales.
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Old 04-27-2010, 12:52 AM   #17
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I would like to know more about this too. I have tried to set up my truck's 4 link and realy don't know all the tricks. I have tried to find some scales to see what the wieghts are but no luck.

How about a step by step how too for us...
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Old 04-27-2010, 01:34 PM   #18
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^sarcasm?
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THIS
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COMPD.

95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989

03 RCLB 4x4, SSR
 
Old 04-27-2010, 02:22 PM   #19
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No not at all. I did not mean for that to sound like sarcasm. What is the first step to setting up a 2wd chassis?

Thanks
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Old 04-27-2010, 02:41 PM   #20
Hurley
 
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Ok; looks like you have something figured out with a 9.91 hahah
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THIS
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COMPD.

95 2500 RCSB 2wd back-halfed and 4-linked
5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4
539/989

03 RCLB 4x4, SSR
 
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