Fully Adjustable A-Arms
#50
Yup that's our car. Group of friends endurance race it. I'm a technician at a popular NW performance shop, and I have aligned and installed a LOT of aftermarket arms. We recently struck a deal with SPL and would run nothing but their products. Quality, ease of adjustment, and design are far above anything else I've seen, including $1400 Tarett Porsche arms.
These arms are only needed if you're lowered enough that you can't dial out enough camber. I think we're limited to a minimum of 3 degrees in the rear.
We use a $15,000 John Bean alignment machine, and I struggled with my first few alignments with the double eccentrics in the rear. I've gotten the hang of it over the last few years and it's now pretty easy to nail my desired toe and camber numbers. If you're struggling with it, you're simply not good at it yet and need more practice.
I don't see much wrong with the rear upper arms in this thread, although it seems like the outer lock nut would be difficult to get to. On an alignment rack any of those 4 lock nuts look difficult to access. With the SPL arms it's one lock bolt and a single adjustment hex.
These arms are only needed if you're lowered enough that you can't dial out enough camber. I think we're limited to a minimum of 3 degrees in the rear.
We use a $15,000 John Bean alignment machine, and I struggled with my first few alignments with the double eccentrics in the rear. I've gotten the hang of it over the last few years and it's now pretty easy to nail my desired toe and camber numbers. If you're struggling with it, you're simply not good at it yet and need more practice.
I don't see much wrong with the rear upper arms in this thread, although it seems like the outer lock nut would be difficult to get to. On an alignment rack any of those 4 lock nuts look difficult to access. With the SPL arms it's one lock bolt and a single adjustment hex.
#51
Ah yes, and as for any questions or concerns about the strength of these arms, I will say I have a small concern for them in terms of getting rid of the triangulation of the stock upper arm. Like I said previously, SPL always produces well designed parts, so I'm hoping there's no issue, but a rear subframe is at max a 2 hour job if the worse happens.
#52
Ah yes, and as for any questions or concerns about the strength of these arms, I will say I have a small concern for them in terms of getting rid of the triangulation of the stock upper arm. Like I said previously, SPL always produces well designed parts, so I'm hoping there's no issue, but a rear subframe is at max a 2 hour job if the worse happens.
#53
Yeah so I saw the spl arms and to me.... They are a bad design. Like it was mentioned they do not resist the rotation of the spindle under power and braking. Any time you allow suspension parts to wind up they will be a hot mess when traction is lost and they unwind, most of the time this manifests as axle hop which I am fighting with mid 2xx hp.
I primarily made these for ease of alignment, but removing all compliance without adding bind is also a big selling point.
I primarily made these for ease of alignment, but removing all compliance without adding bind is also a big selling point.
#54
Yeah so I saw the spl arms and to me.... They are a bad design. Like it was mentioned they do not resist the rotation of the spindle under power and braking. Any time you allow suspension parts to wind up they will be a hot mess when traction is lost and they unwind, most of the time this manifests as axle hop which I am fighting with mid 2xx hp.
I primarily made these for ease of alignment, but removing all compliance without adding bind is also a big selling point.
I primarily made these for ease of alignment, but removing all compliance without adding bind is also a big selling point.
I still want a set of your upper arms. I think paired with the v8r lower arms with heim would be a good setup
#57
I know but if those end heims or what ever they are called had a flat to rest on would that keep the rotational movement from happening because it wouldnt be able to pivot around the bolt? Or am I screwed up on where the rotation is coming from
I was confused but up to speed now. A guy at work just schooled me.
I was confused but up to speed now. A guy at work just schooled me.
#58
Ahh I see where you're going, so the problem is you need to be able to adjust the angle of the clevis to the bracket depending on what toe and camber settings because the angle of the arms will vary depending on both. Because the length of each arm is locked in order for the bracket to rotate the bushing would have to have compliance, I've eliminated this with a delrin bushing. In theory the entire spindle could rotate as viewed from above but because of the H lower arm this will not happen.
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