Thread: B14 rear trailing arm movement?

I believe this is somewhat incorrect

Let me just clear up some confusion before I debate why this is incorrect

Roll Couple - the measure of the distance between the Roll Center and the Center of Gravity
Roll Center - The roll center of a vehicle is the notional point at which the cornering forces in the suspension are reacted to the vehicle body

A higher roll center is what causes jacking force, NOT a lower roll center or longer roll couple. I think you may be confusing several of the terms and definitions



Also, do you have the measurments of the front/rear roll couple?? I have a feeling the front is actually shorter than you think since the CG is slightly above instant center (a little below 3/4 way up the tire height from the ground) and the Roll Center is a little below or at 1/2 up the tire. I could be wrong, but here is a diagram from our strut based front suspension hence why I question

http://www.sr20-forum.com/information-library/60566-roll-center-myths-reality-wm-c-mitchell.html#post818615

@Kyle, not to be offensive but that article leaves alot to be desired for explanation especially since it lacks key figures to convey the concept. Only the very last line somewhat delves into what it is (and very mildly so)

The second by Sarah, the link is dead (I have a hard copy of the book)

The third article in your thread is from where I garnered the information

That is a shame you were unable to gather the necessary information from the thread. Then again, there is probably a reason the thread has very few inquiries and/or replies.

I tried all the HTML links and all of the links seem to be active and working correctly. The hard copy is good to have but there is misinformation in there in small bits and pieces.

Then there is Moto IQ article also in the poast. It’s All in the Geometry- Part One, The Roll Center

No offense taken. Roll center is more complex than what is trying to be dealt out in this thread. Good luck and safe driving, folks.

@Kyle, Nahhh roll center is pretty simple actually. That article just made it unnecessarily overly complex and it made it seemed like it one of the hardest things to graps and only gods of engineering will either have an inkling as to what is being mentioned

My post explains it pretty well and have cool pretty little diagrams for the people who need visual representation

.........Ironically, MotoIQ is where I garnered some of my information in my post lol!

http://performancetrends.com/PDFs/ROLLMAN7.pdf

Plenty of pictures here!

Those articles are written with words, what does any god have to do with it? oh wait, internets fault.

My mistake, I used the wrong word, Jacking forces are actually different then what I thought they were. What I meant by that is, with a bigger front roll couple there is a bigger lever to roll the car onto the outside front wheel.


Here is what I was trying to explain:

Source

Moral of the story

Do not over lower car

lots of good info guys, thanks a lot. this thread went deeper than i expected. guess ill start jackin the ride hight up and hopefully the issue goes away until im able to install a panhard rod. ill start with hammerin hank's advice and raise it an inch all around at first.

Unless they are tailoring this thing to the dump with the caption "The Dog Car is coming back" then you sir, are full of it

.........

Kojima has posted that this car is complete and making a return!

So much for the trash can argument . You can go ahead and sell your beam based car because its trash