69 Barracuda front RMS suspension issue
So on a factory car the steering arm actually puts the ball joint outside the rim. So the pivot point isn’t inside the rim so the wheel to tie rod end relationship doesn’t change. Even with 18” rims and deep backspace that’s mostly true, you can see that on my car with its 18x9’s and ~6.1” backspace
The angle of the tie rod can change and that changes the wheel clearance to the tie rod end, but turning the wheel doesn’t put the rim any closer to the tie rod because of the location of the pivot.
With the RMS you can see the steering arm and rack pivot point is well within the rim, so, turning the wheel changes the clearance between the rack and the wheel. Which limits the backspace if the steering angle is enough to cause interference.
The fix is either less steering angle or less backspace. The fact that it worked on Joe’s car leads me to believe something about the rack has changed.
Yeah I didn’t really think it was an issue with the RMS. It’s getting harder to find alignment shops that want to deal with aftermarket parts or custom alignments. It still surprises me because it’s not like camber bolts are hard to deal with. But I suppose it shouldn’t, since I bought my own alignment gear because it was such a PITA to get it done right.
Do you recall what you were running for caster?
So on a factory car the steering arm actually puts the ball joint outside the rim. So the pivot point isn’t inside the rim so the wheel to tie rod end relationship doesn’t change. Even with 18” rims and deep backspace that’s mostly true, you can see that on my car with its 18x9’s and ~6.1” backspace
The angle of the tie rod can change and that changes the wheel clearance to the tie rod end, but turning the wheel doesn’t put the rim any closer to the tie rod because of the location of the pivot.
With the RMS you can see the steering arm and rack pivot point is well within the rim, so, turning the wheel changes the clearance between the rack and the wheel. Which limits the backspace if the steering angle is enough to cause interference.
The fix is either less steering angle or less backspace. The fact that it worked on Joe’s car leads me to believe something about the rack has changed.
Yeah I didn’t really think it was an issue with the RMS. It’s getting harder to find alignment shops that want to deal with aftermarket parts or custom alignments. It still surprises me because it’s not like camber bolts are hard to deal with. But I suppose it shouldn’t, since I bought my own alignment gear because it was such a PITA to get it done right.
Do you recall what you were running for caster?
