5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH91 Octane Fuel issues
Leading reported evidence
Recommend along
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
This causes rapid filter clogging and immediate fuel filter changes are recommended along with more frequent changes than the Factory recommends.
Leading evidence: 'Recommend along' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Recommend along' (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
This causes rapid filter clogging and immediate fuel filter changes are recommended along with more frequent changes than the Factory recommends.
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
Given many tuners out there have changed the ECU settings to negate safety tolerances for lower octane and such to increase power, what are the repercussions for those folks?
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
This causes rapid filter clogging and immediate fuel filter changes are recommended along with more frequent changes than the Factory recommends.
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
If the ECU changes were done responsibly and conservatively, then the only need for a race gas blend would be for DE events, not for normal street driving.
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
Given many tuners out there have changed the ECU settings to negate safety tolerances for lower octane and such to increase power, what are the repercussions for those folks?
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
If the ECU changes were done responsibly and conservatively, then the only need for a race gas blend would be for DE events, not for normal street driving.
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.
5 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: 20261027T022239Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi:
Recently, the State of California has chosen to eliminate MTBE from motor fuels and instead, use Ethanol as the oxygenate to reduce emissions.
There are some concerns about this change that everyone who drives a performance car should be aware of, especially turbocharged ones.
1) Octane Rating: The highest octane fuels you might see now are 91, instead of 92. This may be an issue for cars with certain performance chips, high compression ratios, and forced induction. 91 octane is, IMHO rather marginal unless this is taken into account when undertaking any program of performance enhancements.
I've posted a matrix chart on our website for blending 91 octane pump gas with 100 octane unleaded race gas. I hope this helps. Look at the URL below.
2) Elastomer Compatibility: This is largely an unknown as the long-term database is incomplete. For certain, Ethanol is well known to attack and slowly dissolve certain rubber parts used in all fuel systems. You may not get the long life expected from such items and this deserves some scrutiny. Ethanol is also an excellent solvent and scours out all dirt, rust, and contaminates in the fuel system sending them into the filter. This causes rapid filter clogging and immediate fuel filter changes are recommended along with more frequent changes than the Factory recommends. This will stop your car dead! Change that filter at least twice a year.
Last, octane boosters are not recommended except in emergencies. The additives in any effective octane booster leave a big brown mess inside your engine and they do not improve octane proportional to costs. Further, these additives WILL attack the rubber gaskets, O-rings and seals with the attendant troubles that this will create in the long term.
Lets Talk about Porsches
Given many tuners out there have changed the ECU settings to negate safety tolerances for lower octane and such to increase power, what are the repercussions for those folks?
Hi Ben:
The repercussions would depend upon the specific ECU re-programming that was done to the car.
In short, some tuners have been very aggressive in making changes to the timing maps and this can initiate the knock sensors to crank the ignition advance back, to the detriment of power output.
If the ECU changes were done responsibly and conservatively, then the only need for a race gas blend would be for DE events, not for normal street driving.
Knowing you're a very conservative tuner, I'd guess your ECU jobs are safe anyway, but I thought I'd ask out of curiousity. Just goes to show you that it's dangerous to go with the other tuners with huge performance claims cause they're probably just as aggressive with their tolerances as they are their claims.
This is a source reference. Confirm exact model applicability in the original material.
