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Old 12-01-2009, 01:03 PM   #1 (permalink)
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4 bar linkage calculator v3.0 instructions?

anyone have a sheet of what exactly to input where on the calculator?

its all fairly self explanatory just wondering if anyone already had a cheat sheet made up.

do all of the same calculations apply for a non triangulated 4 link like you would do on the front with a track bar?

can the calculator be used for both front and rear 4 links without modifications to the formulas?

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Old 12-01-2009, 01:23 PM   #2 (permalink)
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Quote:
Originally Posted by FlagYJ View Post
anyone have a sheet of what exactly to input where on the calculator?

its all fairly self explanatory just wondering if anyone already had a cheat sheet made up.

do all of the same calculations apply for a non triangulated 4 link like you would do on the front with a track bar?

can the calculator be used for both front and rear 4 links without modifications to the formulas?

-flag
you said it yourself self explanatory if you mess around it it works for front and back just take your measurements and plug them in. non triangulated is a waste of time and money. just do a modded 3 link and pan hard then you don't need to calculate.
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Old 12-01-2009, 02:03 PM   #3 (permalink)
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ya i know i was just wondering if anyone had taken the time to label it all. i have it down for the most part now.

how much anti squat should i look for?
118.25wb
47.5's
d60/d70

thanks
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Old 12-01-2009, 02:50 PM   #4 (permalink)
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damn thats a big stretch! i'm at around 111" wb I think. either way I went with a full hydro and didn't 4 link the front? don't know why but did the modded 3 link and its so cluddered up front. I might cut the frame off at the motor mounts and start over cause of clearance issues on the driver side between the coilover and the panhard mount. I'll test it out first though. my lowers are RE long arms which ar 37" long using that upper off the driver side. when I get around to it i'll make a new upper mount that's about 35" as far as the rear just make your spacing on the frame side as close to the spacing on the axle. I wish I had picks of my toyota 3 link. it's bad ass and flexes for days! i'll try and draw a pic of it and send it to you for the back side of your rig.
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Old 12-01-2009, 05:32 PM   #5 (permalink)
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there's a 3-bar link calculator at Triaged's page where you got the 4-bar calculator.

You can use it for front and rear suspensions without modifying formulas.
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Old 06-20-2010, 07:08 PM   #6 (permalink)
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I was searching for something and found this thread. This is a good how-to for anyone else who finds this thread.

http://www.pirate4x4.com/forum/showp...3&postcount=21
Quote:
Originally Posted by tdavis View Post
Let's try this - first, the link pictures I am using are for a mock up, and are not final. So let's ignore the fab portion, ok?

you need to take a bunch of measurements.

First, a rough guess of the CG - One rule of thumb is to measure to the top of the bell housing.

Second, a rough guess of weight.

Get Excel, open the spreadsheet. Put the CG number in field named "Vehicle CG Height"; place the weight in Vehicle Mass. Also fill in wheelbase and Tire rolling Radius (height of tire divided by 2).

Okay, now for the measuring part. You need 12 measurements.

First, the front to rear numbers you need to look and measure from this picture:



Measure from the ground, how high the lines A, B, F are. They go through the bolts holding the links in place. The measurements are straight from the axle or ground to the mounting points; they are NOT link lengths. Run string and pull tight to each mount point if needed.

Line A is the 'Z' field of Frame End of Lower Links
Line B is the 'Z' field of Frame End of Upper Links
Line F is the 'Z' field of the Axle End of Upper Links.

Measure from the axle center line, the length of lines C, D, E and the distance from the axle center line to line F.

Line C is the 'X' field of the Frame End of the Lower Links
Line D is the 'X' field of the Frame End of the Upper Links
Line E is the 'X' field of the Axle End of the Lower Links
Line F is the 'X' field of the Axle End of the Upper Links.

Measure from G (axle center line) to the ground. One tip - I used the same number as the tire rolling radius here.

Line G is the 'Z' field of the Axle End of the Upper Links.

At this point, you are still short 4 numbers. These numbers are the distance between the links. You measure just like this picture:



Measure the length lines H, I, J and K. They go from center of link to center of link (or for ease, left side of link to left side of link on other side.)

Line H divided by 2 is the 'Y' field of the Frame End of the Upper Links
Line I divided by 2 is the 'Y' field of the Axle End of the Upper Links.
Line J divided by 2 is the 'Y' field of the Frame End of the Lower Links
Line K divided by 2 is the 'Y' field of the Axle End of the Lower Links

Fill in these into the spreadsheet, and you should see some numbers come out in the Geometry Summary.

If you check the VectorCalculations Sheet, you will find the link lengths there.
I hope this helps..
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Last edited by Triaged; 06-20-2010 at 07:09 PM.
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Old 06-21-2010, 03:45 AM   #7 (permalink)
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I've been looking for that post by tdavis for about a month now. I saw it on a seearch I did and somehow lost it. Bookmarking it so I don't lose it again.
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Old 06-22-2010, 01:29 PM   #8 (permalink)
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Thansk for the awesome info. Just giving myself a reference to find easier.
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Old 06-22-2010, 01:53 PM   #9 (permalink)
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the tool posted above is great. The question I find people asking alot of, what result will effect on the trail. E.G. people say they have so much anti-squat with a roll center at this location, but what/how does translate to the on trail performance? When you change the value of one, how does it change the value of another? I also see the applications mostly for the rear axle(drive axle) what about the front and how can you/we corrolate braking conditions with the set up(dive/anti-dive)?

I understand just a little about this thing. Thats why I have never attempted a rear link setup due to fear of fawking it up and making things worse on the trail for me.
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Old 06-22-2010, 05:23 PM   #10 (permalink)
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Try these for some numbers. There is also a good thread in the Toy section
http://www.azrockcrawler.com/_images...nks/links.html
http://www.azrockcrawler.com/_images...inksurvey.html
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Link to thread on my calculator http://www.pirate4x4.com/forum/showthread.php?t=204893
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Old 02-04-2013, 07:42 AM   #11 (permalink)
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Awesome information now this is detail, would be nice to see the front 5 link way of taking measurements.
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