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Author Topic:   4link-zlinkrr
dqr-7
Member
posted January 28, 2001 08:13 PM
i have not built any cars like this. my friend aaron larson of extreme chassis in story city iowa builds his new cars like this. they seem to work well, especially on dry very dry tracks. aarons number is 515-328-3700


dqr-7
Member
posted January 28, 2001 09:50 PM
This setup can work on a mod really good...There are a couple of thing you have to remember though. When your running the 4 link LR....the whole reason for this is so that you can add crossweight dynamically in the car as your on the throttle and the cage indexes. And at the same time....on the RR...the main reason for a Z-link is to control Rear Steer. There are several things that happen on this setup that you have to watch....when the left rear loads...it will(depending on the geometry setup of the trailing arms)push the left rear under the car, while the same needs to happen to the right rear just to keep the car square, thus the whole reason for the z-link. It is much harder to achieve this with a 4 link RR..especially if the chassis builder doesnt understand the geometric effects of it or will not give you the proper adjustments to get the correct action of the RR suspension...which will lead to a looser car off of the turns. This is not what you want. If you will look at how to make the z-link counter the aspect of the left rear lead(rear steer), it will increase rear percentage dynamically and also keep the car straight and from skating. This is even more important on mods simply because of the tires. Late Models can get away with much less movement.

hope this helps.
jammin


A2KY2K88
Member
posted January 29, 2001 10:16 PM
JAMMIN,
WHAT ABOUT USING A SPRINGROD FOR THE UPPER RR LINK SO IT MOVES AHEAD ON THROTTLE? ANY EXPERIENCE WITH THIS?


jammin
Administrator
posted January 29, 2001 10:26 PM
What it does is allows the RR to move forward and it will take that motion out of it. Another thing the spring rod does is allows the rear to steer inward on the gas, which allows the car to come off the corners tighter. It does help. The only thing you have to watch on them is your spring rate...it will be different than that of a late model because your not exerting as much force because of the tires....you will have to go down on the rate a little in comparison to a late model to get the same effect. The grip of the track can also be a variable in selecting this spring rate. Force issue again.

The big problem with it, if your running imca...against the rules again...wissota also if I am not mistaken. If you go back to the rubber bisquit job....it will not work quite as well, but it will help some.

The spring rod is one way of getting around those problems.