11 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH997.1 Turbo Pressure & Performance Question - Page 1 - 911/Carrera GT - PistonHeads UK
Reported or suspected cause
loose clip around the turbo unit
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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
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
Turned out to be a loose clip around the turbo unit.
Leading evidence: 'loose clip around the turbo unit' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'loose clip around the turbo unit' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Test looking forward' (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 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'm assured by the garage that I should expect to experience a significantly faster car :-) I've yet to test - looking forward to that!
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
Having done a bit of reading, I'm going to try a pull test today - letting the car get to 2,000 rpm in 5th, then flooring the throttle and checking the boost pressure in normal and sport mode, where I think I should expect 1.0 and 1.2 bar respectively.
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
Having done a bit of reading, I'm going to try a pull test today - letting the car get to 2,000 rpm in 5th, then flooring the throttle and checking the boost pressure in normal and sport mode, where I think I should expect 1.0 and 1.2 bar respectively.
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.
11 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
PistonHeads: 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: 20261026T122219Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
After a long search and a lot of help and support on this forum, I finally purchased a 997.1 Turbo last month.
Stock car, 08 registered, black on black. So far I'm really enjoying it, but I do have a question about performance.
I've noticed a couple of things that are making me wonder whether there might be an issue:
1. At high speeds (70mph plus) the car doesn't seem to pull as much as I'd expect through the rev range - once past 4,500 rpm in 4th, 5th or 6th, the power seems quite 'linear', rather than there being a second kick from the turbo
2. Using the dash pressure gauge (which I realise gives requested rather than actual boost pressure) the reading yesterday never went past 0.6 bar (although this was the first time I've checked it, and the road surface was quite wet - not sure if that makes a difference?)
3. Occasionally if I floor the car on the motorway, there's quite a loud 'hissing' from the rear - can't tell if it's exhaust or engine-rated - and I don't think it appears consistently
Having done a bit of reading, I'm going to try a pull test today - letting the car get to 2,000 rpm in 5th, then flooring the throttle and checking the boost pressure in normal and sport mode, where I think I should expect 1.0 and 1.2 bar respectively. Is that correct?
I'll likely take it to my Porsche specialist this week for a bit of investigation, but any thoughts in the meantime would be gratefully received.
Thanks, as ever!
Edited by stumcnu on Sunday 5th October 07:50
Doesn't sound right. My one has areal rush to the red line from 5000 rpm and is also stock. Even in non sport mode it regularly hits 1 bar.
You're on the right track though. Stick it in sport mode and from 2000 rpm in 6th ay full throttle you should see 1.2 bar if all is well. If not sounds like a loose hose and boost leak.
I wouldn't want to be going out and flooring it under load with the noises you are describing.
You are not running the correct boost either so you seem to have a leak somewhere and you do not want to over spool the turbo.
Are you local to london?
Thanks all.
I've been out of London for the weekend and have just driven back in. Took it incredibly steady on the above advice - barely registered turbo boost.
Will take it into the specialist local to me (Tower Porsche) this week.
Appreciate the advice...
S
stumcnu said:
Thanks all.
I've been out of London for the weekend and have just driven back in. Took it incredibly steady on the above advice - barely registered turbo boost.
Will take it into the specialist local to me (Tower Porsche) this week.
Appreciate the advice...
S
Ahh no probs im in North London and could have met you to see if I recognise the noise.
Glad you got back safely.
Could well be the turbo actuators which adjust the pitch of the variable vane turbos they have a reputation of sticking.
It's not a massively expensive fix and easy for a technician to check
Could well be the turbo actuators which adjust the pitch of the variable vane turbos they have a reputation of sticking.
It's not a massively expensive fix and easy for a technician to check
Could well be the turbo actuators which adjust the pitch of the variable vane turns, they have a reputation of sticking.
It's not a massively expensive fix and easy for a technician to check
All sorted. Turned out to be a loose clip around the turbo unit. This was causing a loss of pressure, which in turn was tripping a number of sensors. As such I wasn't suffering only from the loss of boost pressure, but the power was being held back because of all the senor errors.
I'm assured by the garage that I should expect to experience a significantly faster car :-) I've yet to test - looking forward to that!
Only cost an hour's labour too.
Thanks all for your advice - much appreciated.
This is a source reference. Confirm exact model applicability in the original material.
