911uk

Fuelling Question

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4 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

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YOUR RESEARCHFuelling Question

Leading reported evidence

Replace bikes exhaust you usually have

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

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Suggestion · Original poster
Ii've ridden fuel injected bikes for years and this was always disregarded as a myth by the biking community.....when you change a bikes exhaust you usually have to re-map to get bike running sweetly.
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Fuelling Question

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Leading evidence: 'Replace bikes exhaust you usually have' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace bikes exhaust you usually have' (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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1 matching discussions · 4 captured posts examined · 0 partial discussions

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Replace of induction system etc

Suggestion or failed attempt

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Unsuccessful attempts: 1
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Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion · Original poster
Does the fuel injection system automatically compensate for the introduction of a free breathing exhaust/change of induction system etc?
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Fuelling Question

Run sweetly

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
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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
Ii've ridden fuel injected bikes for years and this was always disregarded as a myth by the biking community.....when you change a bikes exhaust you usually have to re-map to get bike running sweetly.
Original post Read captured discussion
Fuelling Question

Frequently discussed actions (3)

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

Replace bikes exhaust you usually have

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
Ii've ridden fuel injected bikes for years and this was always disregarded as a myth by the biking community.....when you change a bikes exhaust you usually have to re-map to get bike running sweetly.
Original post Read captured discussion
Fuelling Question

Replace of induction system etc

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
Does the fuel injection system automatically compensate for the introduction of a free breathing exhaust/change of induction system etc?
Original post Read captured discussion
Fuelling Question

Run sweetly

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
Ii've ridden fuel injected bikes for years and this was always disregarded as a myth by the biking community.....when you change a bikes exhaust you usually have to re-map to get bike running sweetly.
Original post Read captured discussion
Fuelling Question

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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.

911uk: 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: 20261026T113718Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all. I'm fitting Fabspeed exhaust bypass pipes to my 996 C2 and wondered if anyone could answer the following? Does the fuel injection system automatically compensate for the introduction of a free breathing exhaust/change of induction system etc? Ii've ridden fuel injected bikes for years and this was always disregarded as a myth by the biking community.....when you change a bikes exhaust you usually have to re-map to get bike running sweetly. I read somewhere recently (can't remember where) that the 996's electronics would automatically adjust to a change after a couple of hours driving (i'm guessing via the system's sensors detecting a change in gas flow?)........ Does anyone have the definitative on this as I've always thought "self adapting" fuel injection was total bollocks to be honest... Thanks

POST 2Original post

the fuel system adjusts for the fuel RON Rating but although the exhaust IIRC deals with the output it does or can have an impact but not sure i.e. if you Cat was worn out would the engine timings adjust ?

POST 3Original post

Hi Jim, Are you bypassing the muffler or cats? In general the ECU will adust accordingly to fuel/air and driving style, If you are undertaking the Cat bypass AFAIK there are sensors in the cats (lambda) that will also effect the engine management - although early (98/99) 996's don't have the lambda's so if your car is an early variant then no need to worry on this front, would suggest a custom map to take advantage of any new hardware as well at some stage. Also be aware that if it is a cat bypass you are undertaking make sure you have a freindly MOT station in your pocket... :bandit: - Simon

POST 4 / ORIGINAL POSTEROriginal post

No cats stay in place......just the mufflers going

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