Chassis fabrication and suspension

[profi]

The general design of the 4 link, for starters it binds.

The 4 link above would struggle with power down...

[Abuilder]

It’s not the design that binds it’s the installation / installers that cause it to bind.

A well installed/designed 4 link will have no bind.

The 4 link above would struggle to do anything. The brackets have been put in back to front!!

Good money wasted.

[profi]

A 4 link will not bind when its going up and down, if the left wheel bumps more then the right it is binding... the physics of of it dont allow it not to bind hence why
the later trans am cars have gone to a 3 link. (only down side to this type of suspension is torque steer, but in a sports sedan with limited travel this is made almost irrelevant)

[Abuilder]

A 4 link will not bind when its going up and down, if the left wheel bumps more then the right it is binding... the physics of of it dont allow it not to bind hence why
the later trans am cars have gone to a 3 link. (only down side to this type of suspension is torque steer, but in a sports sedan with limited travel this is made almost irrelevant)

But your taking the 4 link out of the situation it was built for and putting it into something it is just not meant to be in. Yes it will bind if you try to go around corners too fast. That’s why when hot rodders use 4 link set-ups they use 4 equal length bars and no adjusting holes. What is in the above pictures is a badly fitted drag/street 4 link.

[profi]

You are not understanding what im saying, due to having 4 links, it will bind with any movement, small movement it will be un noticeable but once you start bouncing around on them it becomes very noticeable.... get some icepole sticks and some tape and replicate a 4 link and diff. Lift up one side of the "diff" like it is hitting a bump in the track with one wheel. You will notice it will bind, but at our level of motorsport i dont think people have reached the level where this is a major set back. If you dont mind me asking, do you race a sports sedan?

Cheers, Liam

[Abuilder]

You are not understanding what im saying, due to having 4 links, it will bind with any movement, small movement it will be un noticeable but once you start bouncing around on them it becomes very noticeable.... get some icepole sticks and some tape and replicate a 4 link and diff. Lift up one side of the "diff" like it is hitting a bump in the track with one wheel. You will notice it will bind, but at our level of motorsport i dont think people have reached the level where this is a major set back. If you dont mind me asking, do you race a sports sedan?

Cheers, Liam

No I don’t think you quite understand what I am talking about, I know a bit about suspension especially 4 link and thank you for your suggestion of using some ice pole sticks and some tape but I have a working 1/5 scale race 4 link set-up as well as some of the best 4 link and suspension software written and I think they would do a better job.

To answer your other question “do I race a sports sedan” No I do not that is because I just do not have the time but I will say I have been in and around building and racing cars all my life as well as being a professional chassis builder for the last 30yrs building cars and bikes for all kinds of motor racing. I have spent the last 25 odd years building, fitting and setting up drag cars with 4 links and are currently building a new sports sedan for a customer which will not run a 4 link as it will be going around corners.

Any way you look at it, 4 links are purely built for drag racing and work perfectly in this situation.

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This a drag race set-up, for a car that makes around 1500HP

[profi]

okay.... i give up.

[Abuilder]

Liam,

Please don't think that I was trying to have a go at you, it is just that I do have a lot of experience with 4 link systems and I was trying to help you to understand how they work.

[msadyno]

So basically what you are saying is any road racer with a 4 bar has done it all wrong? That would include speedway competitors aswell wouldn't it considering they turn corners ?

[Abuilder]

I was talking about 4link suspension as was in the picture at the beginning of this thread. 4 link and 4 bar suspension are two totally different setups.