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E85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHE85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Clean exhaust?)

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Suggestion · Original poster
perhaps to compensate of the lack of cats cleaning the exhaust?) and that causes it to run rich?
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E85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Leading evidence: 'Clean exhaust?)' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Clean exhaust?)' (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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Run e85 in a 987.1 cayman (without cats

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Suggestion · Original poster
Claims if I am understanding correctly that they run E85 in a 987.1 Cayman (without cats but claim it would not matter) with no issues relating to running lean.
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E85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Clean exhaust?)

No successful repair reported for this finding.

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Reported fixes: 0
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
perhaps to compensate of the lack of cats cleaning the exhaust?) and that causes it to run rich?
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E85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run e85 in a 987.1 cayman (without cats

No successful repair reported for this finding.

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Reported fixes: 0
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
Claims if I am understanding correctly that they run E85 in a 987.1 Cayman (without cats but claim it would not matter) with no issues relating to running lean.
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E85 stock / no flex sensor / tune.. ?? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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POST 1 / ORIGINAL POSTEROriginal post

I am not advocating anyone do this, nor have I ever tried it myself.. I am just curious to see what others who know more on the subject then I do think.. This video: https://www.youtube.com/watch?v=sKygJFnDrlc Claims if I am understanding correctly that they run E85 in a 987.1 Cayman (without cats but claim it would not matter) with no issues relating to running lean. Everything else I have encountered regarding E85 in general says usually stock tunes will not alter the air fuel mixture to compensate for ethanol's lower power density which ideally should be something like 9.8 to 1 where E10 / regular gasoline is 14.7 / 1. To make it more complicated E85 can actually vary quite widely on Ethanol content anywhere from ~50% to ~%85 which will alter the optimum A/F ratio which is why flex fuel vehicles have a sensor to alter the A/F ration on the fly. So, can this guy be accurate? is there something here I am missing? Do Porsche ECUs compensate? He mentions that the car ran rich to begin with.. but ~10 or 11 to 1? seems unlikely. I will admit my 986 (with Fabspeed 200 cell cats) has its own unique rich smell to it.. But just pumping E85 in and all is well???

POST 2 / ORIGINAL POSTEROriginal post

Listening again, I did notice he mentioned having spacers on the O2 sensors with the open exhaust (not sure why that is needed? perhaps to compensate of the lack of cats cleaning the exhaust?) and that causes it to run rich? (hence why it running well on E85)

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