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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

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YOUR RESEARCHX51 owners chime in

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sport exhaust

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Suspected cause · Original poster

At first I thought it that the change in sound was due to my Sport Exhaust.

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X51 owners chime in
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Replace no

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Suggestion · Original poster

- the cam profile needs to change, no?

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Leading evidence: 'sport exhaust' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'sport exhaust' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Replace no' (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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Replace no

Suggestion or failed attempt

No successful repair reported for this finding.

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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

- the cam profile needs to change, no?

Original post Read captured discussion
X51 owners chime in

Replace notes like

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

But to your post, I don't believe the intake and exhaust headers can dramatically change notes like that by themselves....

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X51 owners chime in
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Replace no

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 · Original poster

- the cam profile needs to change, no?

Original post Read captured discussion
X51 owners chime in

Replace notes like

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 · Original poster

But to your post, I don't believe the intake and exhaust headers can dramatically change notes like that by themselves....

Original post Read captured discussion
X51 owners chime in
Reported and suspected causes (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

sport exhaust

No successful repair reported for this finding.

0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect 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.

Suspected cause · Original poster

At first I thought it that the change in sound was due to my Sport Exhaust.

Original post Read captured discussion
X51 owners chime in
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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.

4 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: 20261026T220748Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Can you folks tell me at what RPM your cams "shift"? I was playing the other day and it seems that the cams shift (sounds like the engine shifts gears) at about 6000 rpms. But doesn't this sound a bit too high especially when the rpm limit is around 7k rpms? Can X51 owners tell me when their car shifts cams?

POST 2Original post

Mine is fast at all RPMS. I do notice a definite difference in sound between 6k and 7k, but I think that has more to do with the intake and exhaust headers than the cam timing.

POST 3 / ORIGINAL POSTEROriginal post

Quotes source post: 8674205

At first I thought it that the change in sound was due to my Sport Exhaust. But even when I turned it off, I still get that change in sound at around 6k. But to your post, I don't believe the intake and exhaust headers can dramatically change notes like that by themselves.... I.e. - the cam profile needs to change, no?

POST 4Original post

Variocam Plus on cam timing changes at 3200 rpm for all 3.6L whether or not you have x51 https://rennlist.com/forums/996-foru...t-3200rpm.html However, there is a dip in hp just before 6000 rpm as shown on this x51 dyno plot that may explain the "rush" some x51 owners feel at that rpm. https://rennlist.com/forums/996-foru...-x51-dyno.html https://rennlist.com/forums/996-foru...ar-reason.html I can easily hear and feel the 3200 rpm cam timing change in 2nd gear partial throttle. At full throttle, this disappears. I cannot hear or feel any difference at 6k. My car pulls strong all the way to my 7200 rpm redline from 3200 rpm. Attached dyno plots are thanks to oneeyedjack and 10 GT3

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