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Old 02-22-2011, 11:58 AM
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Drag 4 link compared to street

i own a small fab shop and have done a few 4 link set ups for street trucks, Setting it up around the center of gravity roll center.. etc.. i have read the manual over and over. What my question is how different should i set up one on a drag truck compared to a street truck?. i know most drag cars have a bunch of different axle mounting locations for the lower and upper bars, any insite on why and/or what it would do at the high extream and or low extream? thank you
-the dan

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Old 02-22-2011, 12:09 PM
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Maybe this will be some help: http://www.racetec.cc/shope/
Billy is very knowledgeable and a regular here.
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Old 02-23-2011, 05:36 AM
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I'll save you a little time searching at my site. For a street car (or truck), you should probably back off a bit on antisquat to avoid wheel hop during braking. You might use 100% for the strip, but only 50% for the street.
http://www.racetec.cc/shope
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Old 02-23-2011, 09:20 PM
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I've been over Billy's site one end to the other many times. I pick up something I missed everytime I read it. great info.

I have a true 4 link on my Willys Pro street that I built myself. The rear end is very narrow with big tires. At first with the locker in it would kick the rear end over to the right and leave a pair of big "C" on the pavement. I added a 1 1/4 in anti roll bar that is only about 18" long so it is very stiff. I was actually worried that it was too stiff for the street so I made up a pair of spring loaded links. These had heavy die springs. They worked ok but only flattened the "C" so it really needed some pre load. I then made a pair of solid links with left and right rod ends. I tried no preload and it was better than the spring loaded links but still the car didn't launch as straight as I wanted. I added 2 full turns preload and that did the trick. It launches nice and straight. I disconnected the bar and tried it again just to verify the result and the car did the big "C" again so I connected everything back up.

Now, on the street right turns like freeway cloverleafs are pretty good, it really digs in. But on left turns it noses over a little, not bad but I can notice it easily. I backed off the preload 1 turn and that seemed to help and is a good compromise.

As for anti squat, according to the calculations I get about 50% over neutral. This seems to work very nice. I don't have any braking problems even in the rain. I tried a hard stop in the rain and it still stops very well even with the big Hoosiers. You just don't want to go into boost in the rain however. haha
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