my roll center correctors
 

Hey guys, I thought I would share with you guys a roll center correction I made for my car. Sorry I don't have pictures of the steps I took. Just a finished product. I saw another one that was made and designed it similarly.
-1/2 chromoly steel cnc water jet cut and cnc bent body
-tig welded chromoly cups that holds in my replaceable fk spherical bearing
-modified bolt that had been machined for bearing movement and modified to fit factory spindle with no modifications
-stainless steel spacer

https://cimg6.ibsrv.net/gimg/www.rx7...3d9a372a66.jpg


Welded with a machined heat sink so the cup wouldn't get too distorted


https://cimg1.ibsrv.net/gimg/www.rx7...a1763443b8.jpg


https://cimg2.ibsrv.net/gimg/www.rx7...84b30c5557.jpg


Car on a 4 post lift. I wonder how it would look without the roll center correction. The picture was taken at a slight slant , so it's hard to see how parallel it is

https://cimg2.ibsrv.net/gimg/www.rx7...8825b0007c.jpg



This is how low my car is with shine fenders and 17x9 , 255 40. Shine fenders sit lower, so stock fenders would have even more of a gap. Not super slammed. Now I really wonder how my control arms would look without the roll center correction

Neato! I wish something like this was readily available, along with some tie rod ends for a manual steering rack.

I can always ask my buddy to cut out a few more frames and spacers. I made only a few for my friends and I

Would it be possible to make "longer" ones if more camber was needed? I think my brother would be interested.

following these with interest.

I'll take a set as well.

I'm going to be running these. Excited to get them and test them out.

I was considering that, but my main concern was that adding camber with longer arms would slightly effect wheel to fender clearance.

I have Mazdatrix bump steer end links on my manual rack. I will be using them
with this kit.

The Mazdatrix endlinks need to be tapped deeper on the tie rod side to work correctly, but after that they are good.

Also, you can lower the car more without sacrificing roll center. Lowe car=more camber. JK, that's not the way to do it, but true :lol:

damn i want a pair of those!

After reading this, I bought some material to make my bump steer. The ones in the picture I bought for too cheap. It's not that I'm not expecting them to last long, which they probably won't, but they bind before I get to full lock

So if anyone is interested, I have a few to sell. I will not be making more of them. It took a long time to make trying to use high quality components. I got a few people asking to make it longer for more camber, but there would be a small sacrifice for fender to the wheel clearance. Not enough peole that actually road race and drift their cars and interested in handling performance vs big single turbo upgrades. I guess its a rotary thing. I've had people ask me what roll center was! I'll leave it at that

Definitely want a set. Just emailed and PMed.

replied, I only have one more. Not making anymore because of the lack of people wanting them.

what if i want 10? 5 pairs?

That is a possibility. But I would need a deposit so people wouldn't back out.

I ran into issues when I already had to much invested in it. The fk bearing cups I purchased had 0.025" movement up and down when in the cup. It was a little much imo. I was able to find these other cups that only had 0.010" movement, but the way the cup was cut, the bearing would not be able to have full movement. So I ended up even having to get the cups machined down more.
After all the nickels and dimes, the price added up, and had these roll centers out for almost 6 months and only sold a few. One got damaged in assembley process, one went to me, I traded 3 of them for a part I needed, and I sold 4 so far. I would have to really add everything up. I may consider it.

Not to mention I remember awr ones selling for $350, when I saw them on their website. Theirs did not have much roll center correction

i was just looking to have 2 for myself and 3 for myshelf.
pm me a price so u dont get in trouble..

Just got mine in the mail today, I wasn't honestly sure what to expect with them. BUT HOLY SHIT THESE THINGS MEAN BUSINESS! Banana for scale obviously,

https://scontent-atl3-1.xx.fbcdn.net...88&oe=572AEAA4

Thanks. I made them .5" thick because the thickest part of the factory ball joints is 1/2" also. Also , I knew that people using them were going to track their cars, drift, or autocross, so I sacrificed a little weight 3/8" vs 1/2" for strength

The weight is all low and unsprung, that little extra is negligible for improved strength.

I'm going to redevelop these in the next few months with a few added benefits. Not set on price yet, but it'll be done right.

I have a question: Has anyone plotted the stock FC mounting points into a 3D suspension geometry program? I'd like to know where the moment centers and the roll center are at stock. IE: How bad is it? Or is the philosophy here just to put the tie rods parallel to the lower control arms and that's it?

thanks,
Jeff

not that I know of. I made these because I wanted to improve it. Unfortunately there is no adjustment on my kit. Making diferent sized spacers you could stack everything differently but it would take a lot of time and money.

I just wanted to improve and restore the lost roll center. Especially since macpherson strut suspensions want a lot of camber. So these also help me minimize camber loss. I also wanted to improve the roll axis