3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHeffect of tyres on oversteer/understeer
Reported or suspected cause
right flick
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
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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 report identifying a cause
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Reported cause · Original poster
You know, you typically have to flick left followed by immediate flick right and then straighten up ,it was the right flick that gave the oversteer....
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
When it got to winter here ( cold + wet,-2 to +5C ,no snow ) I checked pressures - they had dropped all round to 33 at the lower ambient temp - reset to 36 front/38 rear cold.
Leading evidence: 'right flick' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'right flick' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check pressures - they had dropped all round' (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
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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
When it got to winter here ( cold + wet,-2 to +5C ,no snow ) I checked pressures - they had dropped all round to 33 at the lower ambient temp - reset to 36 front/38 rear cold.
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
do you drive on in circles in the same direction all day long ;-) or have you run with that tire underinflated for an extended period of time?
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
After doing some track days in summer I started to set pressures at 36psi all round.
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
You are using same pressure in the rear than in the front on a rear-engined car.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check pressures - they had dropped all round
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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
When it got to winter here ( cold + wet,-2 to +5C ,no snow ) I checked pressures - they had dropped all round to 33 at the lower ambient temp - reset to 36 front/38 rear cold.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
right flick
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that report identifying a cause
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.
Reported cause · Original poster
You know, you typically have to flick left followed by immediate flick right and then straighten up ,it was the right flick that gave the oversteer....
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.
3 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
my car has 18 inch wheels with contisport contact N1 & ZR rated tyres , size 225/40 front and 265/35 rear, one of rears is more worn than rest, down to 2mm tread or so ,other rear is 7mm, both fronts are 7mm.
After doing some track days in summer I started to set pressures at 36psi all round. When it got to winter here ( cold + wet,-2 to +5C ,no snow ) I checked pressures - they had dropped all round to 33 at the lower ambient temp - reset to 36 front/38 rear cold. When they were at the reduced (33) pressure allround I had noticed some oversteer setting in at low speed turns crossing round the 'roundabouts' we get on UK roads. You know, you typically have to flick left followed by immediate flick right and then straighten up ,it was the right flick that gave the oversteer....
Right now the car seems to be driving 'different' by following tramlines in the road - usually the grooves made by heavy truck tyres - and still moving about a bit on turns especially in the wet.
Is it simply that I need to put the rear tyre pressures back up to 44psi handbook setting ? Or is it made worse by the worn RHS rear tyre ? And is the tramlining only affected by front tyres ?
You are using same pressure in the rear than in the front on a rear-engined car. The general concensus I have seen for the rear weight biased 996 is 32-34 on front and 34-36 on rear (which raise to about 10 psi more when hot). Porsche "recomended" is about 36/44 I think?
I personally find my C4 with 18" wheels (and ROWM030) handle best with about 32 front and 36 rear (if I did the conversion from Kpa units right.) Do you have 17" or 18", C2 or C4?
Rapid weight tranfers from side to side such as the left turn to right turn roundabout example you mention will tend to provoke oversteering even on a neutral-understeer balanced car such as the 996. I used to have an M3 (modded with a more oversteer setup) which would get really tail-happy on chicanes.
But how do you have only one of the rears worn out? do you drive on in circles in the same direction all day long ;-) or have you run with that tire underinflated for an extended period of time?
You must also remember that when it gets cold out, your Summer performance tires will lose alot of their grip, causing the car to handle corners differently than they would in the summer time.
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