I'm replacing my rod ends and want to make sure I get the lights correct. I have the document with the original rod end lengths for the A-Arms and made a jig for setting to these lengths. But then I got it all apart and the factory provided lengths don't match up to the ones referenced in the documentation. Does anyone have some experience with this or know what the actual lengths should be? (Need data for front and rear upper and lower)
Rod end length help
- Thread starter LGMan717
- Start date
Hi Lance, just confirming - are you measuring from the center-to-center of the spherical joints?
The attached measurements are what you should be showing.
The attached measurements are what you should be showing.
Yes I am measuring center to center on a very precisely drilled jig. That is the document that I have (as well as that Excel document defining the changes to make to adjust caster). Compared with this document my car has these differences...
FTWB: A is shorter, B is longer
FLWB: A is longer, B is shorter
RTWB: same as diagram
RLWB: A is shorter, B is longer.
Differences are a few turns, maybe 0.25in at most (see pic - it is of the length difference on the "A" measurement of the RLWB compared with the 29.2 it should be)
The RLWB is what keyed me in to a potential issues because when I got a new one you guys set it up for me with new rod ends which I assume we're set up on your jig and the lengths are different.
If this document absolutely represents the new car setup for the suspension I will go ahead and change everything to match this.
Thanks for taking the time to go through this with me.
Attachments
Would it be possible for you to provide an image of the wishbones mounted on the jig for our reference?
Yep. Here ya go. Holes drilled on Center on a rectangular frame piece of aluminum. Bolts slid through The jig and then the rod ends with with top hats in place for specific lengths. I reconfirmed all the lengths.
Attachments
This arm is one of the older style arms with the larger triangle support weld in the middle. We have seen some fitment issues with other teams as well. If you can get a measurement from heim to heim, the "C" measurement in the baseline PDF, that will help determine the appropriate lengths.
Interesting
Doesn't help with determining what the length of each side should be. There a multiple combinations that can results in C being the specified length. The car is a 2023. You have changed the a-arms since then? The replacements I have recorded are exactly the same.
Do you have any of these at the shop that you could measure since the lengths on that document don't seem to apply? (Setting to those lengths does not result in the specified c measurement)
If I adjust the rod ends evenly to be able to meet that "C" measurement it results in them being turned out quite a lot. Here are pics showing the difference. Seems extreme and potentially fragile? Would this be correct? This is on the RUWB which I know takes a ton of abuse.
Attachments
Wrap up for anyone who finds this thread in the future.
The folks at Sebeco were kind enough to go through and measure the lengths on their jig and a car in their shop and confirm that the numbers on the sheet published above are correct. No idea why mine were off from these but I will be setting it up to these specs plus an adjustment to decrease caster as indicated on this diagram.
Thanks! Looking forward to getting back out there.
The folks at Sebeco were kind enough to go through and measure the lengths on their jig and a car in their shop and confirm that the numbers on the sheet published above are correct. No idea why mine were off from these but I will be setting it up to these specs plus an adjustment to decrease caster as indicated on this diagram.
Thanks! Looking forward to getting back out there.
