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2G Tubular front k-member build - share ideas!

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I started thinking. If the LCA is adjustable then when its adjusted out wouldnt the trailing control arm cause toe? As that does not move that would make sense right or am i thinking wrong?
 
Any updates on the front LCAs? Would love to pick up a set for the race car :cool:
I just moved last weekend. I still need to set up my shop and catch up on 3 subframe builds. I'd like to do some sort of group buy on the front LCA's sometime around March or April. That's the plan as of right now at least.
 
I started thinking. If the LCA is adjustable then when its adjusted out wouldnt the trailing control arm cause toe? As that does not move that would make sense right or am i thinking wrong?
Toe is set via the tie rod ends. But if you adjust the LCA length by a large amount greater than the OE length, it will cause the compression arm to bind. I could only recommend very small length changes if any at all. And I wouldn't recommend using the LCA to make primary camber adjustments.
 
Paul, the ball joint threads needed to be ground down and use a shallow tri-lock nut. The axle boots got shredded with them at stock length. As well, we had to take them off because we were dealing with some other suspension binding issues we were trying to track down.
 
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Toe is set via the tie rod ends. But if you adjust the LCA length by a large amount greater than the OE length, it will cause the compression arm to bind. I could only recommend very small length changes if any at all. And I wouldn't recommend using the LCA to make primary camber adjustments.
Of course thats the main adjustment but if the trailing control arm is fixed then it has zero movement from factory then any camber adjustment will cause in/out toe straight off from what i was guessing! I sat under my suspension over christmas having a little play around and it does not give any leiway atall.
 
Did we miss something?

I think he was referring to Tim's post in this thread.

Paul, the ball joint threads needed to be ground down and use a shallow tri-lock nut. The axle boots got shredded with them at stock length. As well, we had to take them off because it was giving a bunch of suspension binding bumping sh** going on. I think the strut fork needs to have a floating bushing in there as I believe the spherical bearing was causing the suspension issues on the track.
 
As well, we clearanced the tie rod ends at the spindle (the tabs next to the tie rod end in the spindle casting), and replaced the lower control arms with OEM ones; all problems gone. Car drives like a dream.

UPDATE; the binding issues were not the control arm, it was the spindles and tie rod ends. Pauls control arms are back on with no problems.
 
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any news on lca and/or have you thought of making upper control arm for the front and back also??
 
As well, we clearanced the tie rod ends at the spindle (the tabs next to the tie rod end in the spindle casting), and replaced the lower control arms with OEM ones; all problems gone. Car drives like a dream. We will have to revisit the ones Paul made when we have time in the future.
Thanks for chiming in, Tim. I got an e-mail from Andrew stating he solved the binding issue by clearancing his adjustable aftermarket tie rod ends. He said he set the tubular LCA's back to the OE length and reinstalled them, and resorted back to using the upper arm for camber adjustments. So it seems all is well again with the LCA's. I'm glad you guys got it all sorted out.

And I'll be sure to clearance the stud on future sets to give ample CV boot clearance.
 
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Hey guys I should make sure this is super clear about what happened when we tested the arms on my car! I think it makes it sound like something was wrong with the arms and it wasnt, they were perfect.

We replaced our uprights and all our arms at the same time. I knew that something was binding on the suspension and I made a bad assumption that we had changed everything to the same parts except the LCA. We did have to fix the boot interference issue but that had nothing to do at all with the LCAs. That was only an issue that we had because we had a combination of the Robispec modified front subframe plus Paul's LCAs. Both Paul's LCA and the Robispec frame try to do the same thing so it was like doubling up on that angle change and it made the boots to be closer. Anyone just buying these would not have that problem and if you are using the Robispec subframe you will need to do some clerancing. The arms were perfect.

Second problem was that I thought the binding problem was due to the new LCAs but it was not... After we got a chance to go over the car again we figured it out. What I did not realize was my tie rod ends were built at robispec... they required clearancing of the uprights slightly at the end of the arm. Robi might have told me before, I'm not sure it was years ago and in the last seconds before a race. When we swapped in brand new uprights they had not been clearanced so any time the car was accelerating and the arms extended they were binding up the suspension causing our handling problem.
I knew it was a bind but I guessed wrong about what arm and why. I thought it was due to us adjusting the camber with the new LCA but that was not the issue.

We resolved that and tested again.

I feel bad that it was even presented anything was wrong with the arms when there wasnt anything wrong at all except how we were using them. A process like this takes so long since the car is located in Australia Im lucky if I can get out there to test a few times a year so we had semi diagnosed but not repaired the problem until later. What I thought it was and what it turned out to be were quite different.
 
My father and I have a machine shop specializing in prototype and small batch production pieces. We're fully equipped to fabricate what you need. Feel free to PM me the response to the question below and we'll quote you price for each.

Do you have blue prints or will we be taking measurements from an an existing component?
What kind of tolerances are you looking to hold?
Will you be supplying the material and/or hardware?
How quickly do you want the components?


Roger
 
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