7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCaster adjustment with eccentric bushings
Leading reported evidence
Replace with adjustable or gt3 type
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Discussions that performed work without a confirmed outcome
1
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Performed · outcome unconfirmed · Original poster
There are many suppliers of eccentric/adjustable caster bushings for the 996 front and rear lower control arms when OEM (fixed) are replaced with adjustable or GT3 type.
Leading evidence: 'Replace with adjustable or gt3 type' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust back' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Discussions that contain suggestions
1
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Suggestion · Original poster
Absent other advice, I may just reassemble the OEM arms and measure some reference points and simply adjust back to that if/as needed.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
Quote: "Since the Porsche rear suspension utilizes a trailing arm design, which has a tremendous amount of built-in caster, there is no specification for the rear caster." So if we increase camber as it suggests in that same write up, what are we adjusting caster back to - assuming increasing camber by extending LCA also affects caster?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion · Original poster
What I understand is that increasing camber by extending the LCA will add more caster and so on the front, we use the eccentric to reduce it (push LCA back) to original spec.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion · Original poster
I'm new to going beyond R&R OEM on suspension and simply looking to gain from others experience on using all the now available adjustments.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
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Suggestion · Original poster
Quote: "Since the Porsche rear suspension utilizes a trailing arm design, which has a tremendous amount of built-in caster, there is no specification for the rear caster." So if we increase camber as it suggests in that same write up, what are we adjusting caster back to - assuming increasing camber by extending LCA also affects caster?
Discussions that performed work without a confirmed outcome
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Performed · outcome unconfirmed · Original poster
There are many suppliers of eccentric/adjustable caster bushings for the 996 front and rear lower control arms when OEM (fixed) are replaced with adjustable or GT3 type.
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
What I understand is that increasing camber by extending the LCA will add more caster and so on the front, we use the eccentric to reduce it (push LCA back) to original spec.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
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Generation: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
There are many suppliers of eccentric/adjustable caster bushings for the 996 front and rear lower control arms when OEM (fixed) are replaced with adjustable or GT3 type. What I cannot find are any how to's or process for setting up both front and rear utilizing these mods. I have found specs in various threads for front caster settings but nothing for rear. What I have is ER caster bushings which have an offset thrust arm bolt hole that can rotate 360 degrees. Unfortunately, ER don't have any install or setup info, I've tried looking on other supplier websites and searched here as well but can't seem to find anything.
Appreciate if anyone can advise or lead me to an appropriate write up/thread on setting up the suspension using these mods.
**What I am installing are ER adjustable lower control arms (coffin), adjustable thrust arms, Ohlin coil over with Tarrett top plates. OEM upper control arms on rear (dogbones), Tarrett toe arms.
Wow, sounds like a first class set-up, nice! If you don�t get a good forum response, you may want to reach out directly to nickshu or slakker or someone like that who has built a suspension from the ground up. Just curious, what caster settings are you shooting for?
Thanks for your response. I'm new to going beyond R&R OEM on suspension and simply looking to gain from others experience on using all the now available adjustments. There must be many, and I've just received some excellent guidance from Chuck at ER and Ira at Tarrett.
What I understand is that increasing camber by extending the LCA will add more caster and so on the front, we use the eccentric to reduce it (push LCA back) to original spec.
On the rear, I was thinking that increasing wheelbase by pushing LCA rearwards would add stability but I'm hearing this is a debate and perhaps just keep at spec. Now I need to find original spec for rear caster and how do we measure it. Perhaps simply a question of maintaining wheel clearance measures?
Much, much, more to learn.
Yes, I read that and either I don't understand it or?? Quote: "Since the Porsche rear suspension utilizes a trailing arm design, which has a tremendous amount of built-in caster, there is no specification for the rear caster." So if we increase camber as it suggests in that same write up, what are we adjusting caster back to - assuming increasing camber by extending LCA also affects caster? Absent other advice, I may just reassemble the OEM arms and measure some reference points and simply adjust back to that if/as needed.
This is a source reference. Confirm exact model applicability in the original material.
