20 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Leading reported evidence
Adjust virtually any octane 93 and below
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
The ECU will adjust for virtually any octane 93 and below
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'Adjust virtually any octane 93 and below' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Adjust virtually any octane 93 and below' (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.
Fill =lower cylinder pressures = lower octane requirement
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.
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run 60% 91 octane and 40% 100 octane
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
I'm thinking of running 60% 91 Octane and 40% 100 Octane to average 93 Octane which the manual states is the best Octane
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run blackstone uoa, and you'll see about 1-2 ppm
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
If you don't beleive me, run a Blackstone UOA, and you'll see about 1-2 ppm on your next test result.
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test engine
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
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance.
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Test engine
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
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance.
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use similar
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
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance.
100 Octane - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
1 acknowledgements have no verified action link; they do not establish a repair result.
Outcome without a verified action link
You will basically see no difference between 91 and 93 RON
Higher altitude you can never find the higher octane stuff like down low. But you don't need it, either. Air density is too low. Use 91. It's appropriate for your car at that altitude.
Sent from my SM-G930T using Tapatalk
Our low octan gas here is 95 but I honestly can tell the car runs better on the 98 not really power wise but just smoother. I usally put high octan every other tank full. But I dont necassarily beleive its a required. You need to spoil your baby sometimes
Not sure where you're at, but you're probably looking at RON numbers. Not the same rating scale. (Unless you're regularly buying fuel at the racetrack).
From wikismedia:
"Another type of octane rating, called****Motor Octane Number****(MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON.****MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable****ignition timing****to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern pump gasoline will be about 8 to 12 octane lower than the RON"
RON is more common worldwide, but RON has been the US standard for a long time. (Though we're beginning to see RON listed at many US pumps)
Sent from my SM-G930T using Tapatalk
Here are 2 MAJOR problems with your idea/plan:
1) The 100 octane is not going to be very fresh. At a race track, yes, but NOT at your local corner gas station.
2) Unleaded race gas like this still has elevated levels of lead. If you don't beleive me, run a Blackstone UOA, and you'll see about 1-2 ppm on your next test result.
I live in Spain by gas on US installation pump states 95 Octane in town pump tates 98 Octane, but on the base they are required post us rating. Will look to see if it say RON though.
Actually (1) the pump is located near the Bandimere Race 1/4 mile race track. So, it is highly likely it is fresh. Though lead is used in racing fuels it is not used by itself, but mixed with Tetraethyl Lead. So in my example, mixing a small percentage of 100 with 91 to reach a 93 on rare occasions seems insignificant.
My understanding is any lead in the gas will kill the cats.
You will basically see no difference between 91 and 93 RON
The ECU will adjust for virtually any octane 93 and below
Which results in less oxygen, by volume, in the cylinder. ;-)
You're both right. But ultimately it's the cylinder pressure which, as it increases, requires a higher octane (resistance to detonation). Thus: lower air density=less cylinder-fill=lower cylinder pressures = lower octane requirement.
Sent from my SM-G930T using Tapatalk
This is a source reference. Confirm exact model applicability in the original material.
