18 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHFront end feels unstable at speed
Leading reported evidence
Replace tires
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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 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
So you had no front end issues, changed the tires to used ones that you stored in the basement and now you have issues.
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
Also since you're playing with a different set of tires which has different characteristics, I would try adjusting your tire pressures as one pressure setting doesn't work for all situations, especially if you have any aftermarket suspension components.
Leading evidence: 'Replace tires' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust tire pressures as one pressure' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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 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
So you had no front end issues, changed the tires to used ones that you stored in the basement and now you have issues.
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
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.
Suggestion
Also since you're playing with a different set of tires which has different characteristics, I would try adjusting your tire pressures as one pressure setting doesn't work for all situations, especially if you have any aftermarket suspension components.
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
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.
Suggestion
If you are sure about the tires/wheels (see Macster's post), then get your body work fixed and have it checked for additional damage while you're in there.
Check bumper, the front splitter was almost torn off
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
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.
Suggestion · Original poster
I pulled over about half a mile later to check the bumper, the front splitter was almost torn off.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Adjust tire pressures as one pressure
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
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.
Suggestion
Also since you're playing with a different set of tires which has different characteristics, I would try adjusting your tire pressures as one pressure setting doesn't work for all situations, especially if you have any aftermarket suspension components.
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
If you are sure about the tires/wheels (see Macster's post), then get your body work fixed and have it checked for additional damage while you're in there.
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
Also since you're playing with a different set of tires which has different characteristics, I would try adjusting your tire pressures as one pressure setting doesn't work for all situations, especially if you have any aftermarket suspension components.
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
I was thinking an alignment would help and it very well could be the issue, but I do not have pulling (aside from camber of the road, which has been the case since I test drove it).
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.
18 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
So I had a set of MPSS tires with 80% life in them in storage, put them on my 996 last week and all of the sudden I'm having front end issues. Before taking them off I had no issues and they sat for about a year in my basement.
Once I get to higher speeds (110 or so) the front end just feels unstable and the steering wheel starts shaking. I didn't have an issues just the week prior with bad front tires (rears are still good, about 6k miles on them, I'd say about 50% life at least). I took her back to the tire store, they re-mounted and balanced the tires, said everything was in spec of new MPSS and I shouldn't have issues.
I checked the bushings, roll bar, tie ends, etc no issues I could visually see. All front end components are just 3.5 years old with about 30k miles. - Any other tests I could do?
I've been thinking wth it could be and remembered I hit a squirrel the other day on the freeway, so about 75 mph, it felt like I went over a speed bump. I pulled over about half a mile later to check the bumper, the front splitter was almost torn off. I pushed it back in, the best I could and there is still a small space between the bumper itself and the splitter (maybe 2 cm gap). Could my stability issues be aerodynamic problems?
TIA
Here are some ideas. Uneven tire wear, inflation issues, alignment(especially after squirrel incident), flat spotted tires. No doubt others will chime in.
So you had no front end issues, changed the tires to used ones that you stored in the basement and now you have issues. Hate to say it - get new tires.
Try a few different road tests first. If you can find an asphalt highway that would be best to eliminate the possibility of tramlining with the new tires. If it feels like darting slightly left and right it could be the road surface. Next, yes - aerodynamics plays a huge role in how the front of the car handles but you mentioned steering shake, and unlikely aero issues would cause that. More than likely you have a slightly out of true rim, or the tires are just out of round. You could dismount them and reverse the tires on the rim then remount them on the other side(if they are directional) to see if that helps. While the tires are off, check the wheel carefully for true.
Did you actually observe the tires being removed and remounted and rebalanced? Frankly knowing what I know about tire stores I find it hard to believe the tires were actually removed and remounted let alone rebalanced.
Tire stores are notorious for dismissing tire balance problems as all in your head. The tire store mounts/balances tires for all kinds of Toyotas/Hondas/et al and the owners are happy but seldom see speeds above highway speeds.
So a Porsche owner shows up and his tires/wheels get the same treatment but when the Porsche owner gets the car up to speeds other cars can only dream about the balance proves to be inadequate.
The car is taken back and the tire store unstead of actually just checking the balance will let the tires sit out of sight a while as the techs are all busy with customers who are paying for new tires and then return the tires to you otherwise untouched.
On the surface the symptom appears to be a tire balance problem. Assuming tire inflation is good and the tires are if uni-directional mounted in the right direction of rotation I'd seek out a shop that can load force balance the tires. You may have to pay for this service but at least you know it was done.
If afterwards the symptoms remain then there are other things to consider.
This would be good to check. Manafacturers code in the manufactured date next to the DOT marking on the sidewall(usually within a circle for month and year).
I would check that.
Also since you're playing with a different set of tires which has different characteristics, I would try adjusting your tire pressures as one pressure setting doesn't work for all situations, especially if you have any aftermarket suspension components.
So does it still have the issues after that? It's not quite clear to me if you have since tested it (guessing yes).
Did this happen before your issues started?
At the speeds you are talking about the aerodynamics become very important and if you have something that is not directing air as it should, it's not going to drive right. It will be worse if something is loose and causing buffeting.
If you are sure about the tires/wheels (see Macster's post), then get your body work fixed and have it checked for additional damage while you're in there.
You said they were in storage, but I don't think the original post says how long they were in storage.
I was assuming they were stored since last fall, but...me and White Out want to know how old they are.
I would like to ad that with all the different 996 cars I have owned there was a difference in feeling in the front end with a full gas tank vs empty. The car is more planted and stable with a full tank.
Thanks all, all great advice, yeah I think there is something buffering around the radiators or something, I'm going to remove the bumper and look at everything this afternoon. Manufacture date was 2013 and they were stored for roughly a year in a clean, dry basement.
Slakker MPH - closed course of course.
I'm going to request they swap the tires & road balance as well. I've been buying tires (these included) from the same store for about 8 years, to the point the manager knows me on a first name basis. Not saying that doesn't mean a tech just removed the tires and set them aside to appease me, so I'll hang out and watch them this time.
I was thinking an alignment would help and it very well could be the issue, but I do not have pulling (aside from camber of the road, which has been the case since I test drove it). Also the steering wheel is still dead center.
As funny as it sounds, I wonder if when I did the radiators the week before the tires I missed a clip/slide through or something underneath the gas tank
Well did the road force balance, tires are perfect per the tech, no bends in the wheel. The drivers side was .5oz out of balance, he said that shouldn't be the issue, so we'll see.
Thanks all
This is a source reference. Confirm exact model applicability in the original material.
