Moved to High altitude City and Adv. Mult dropping

[JerryMichaels7]

why do you think it is only 94-95 octane? it most def is 105-108 Octane

[steve99]

Originally Posted by w00t692

negative it was R+M/2 like all US gas is rated on the AKI scale.

But it is actually more like 94-95 octane apparently. Doesn't perform like that in practice though.

not all fuels are the same yours may be different, definitly states 105 RON I don't have facilities to test so I have to take their word on it

this stuff is constantly E85 not varied like some fuels between E60-E85 suspect these fuels may quote octane for E60 mix ie worst case.

http://unitedpetroleum.com.au/united/fuel/ethanol-85

[w00t692]

[ame="http://en.wikipedia.org/wiki/Octane_rating"]Octane rating - Wikipedia, the free encyclopedia[/ame]

Find e85.

102-105 RON, 94-96 AKI.

I'm sorry i don't see the issue here, i use e85 i'm not "dogging" it. The octane rating means almost nothing for e85, and it has a lot to do how it uses so much more fuel and also wants to run richer. Similar to how when turbocharged you run more gasoline to cool egt and combustion.... e85 does something similar even when your'e na.

look at this picture closely:



Notice it's R+M/2 and it says 105 octane. That's an ancient pump that has an old sticker, look at the AKI on wikipedia, it's been lowered a lot.

There's a few reasons, mostly explained by another member on here, but one of the big reasons is the gasoline they mix ethanol with is not 93 octane, or 91, not even 87, but 85 octane.

Also the AKI of pure ethanol was changed a lot (not sure why, perhaps more research into it's knock properties) and lowered from about 108 to 99

[steve99]

Originally Posted by w00t692

Octane rating - Wikipedia, the free encyclopedia

Find e85.

102-105 RON, 94-96 AKI.

I'm sorry i don't see the issue here, i use e85 i'm not "dogging" it. The octane rating means almost nothing for e85, and it has a lot to do how it uses so much more fuel and also wants to run richer. Similar to how when turbocharged you run more gasoline to cool egt and combustion.... e85 does something similar even when your'e na.

look at this picture closely:



Notice it's R+M/2 and it says 105 octane. That's an ancient pump that has an old sticker, look at the AKI on wikipedia, it's been lowered a lot.

There's a few reasons, mostly explained by another member on here, but one of the big reasons is the gasoline they mix ethanol with is not 93 octane, or 91, not even 87, but 85 octane.

Also the AKI of pure ethanol was changed a lot (not sure why, perhaps more research into it's knock properties) and lowered from about 108 to 99

Don't have a problem either mate, E85 is good using it now, suspect you maybe correct that the petrol they mix in some e85 blends is very low octane, which in conjunction with the varying ethanol percentages in some blends would account for wide variation in claimed octane ratings whether RON/MON/AKI.

We have two distinct blends here in Australia both referred to as E85 but one is actually E-flex and varies E% between about 60-85 and another which is solid at E85 . I prefer the "E85" that is actually E85 which has a quoted octane rating of 105 RON. (well that at least what they quote in the data sheets)

[Kronos]

My adv. multi drops to 0.98 but no knock correction has occurred? Does anybody know what this means?


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[steve99]

Originally Posted by Kronos

My adv. multi drops to 0.98 but no knock correction has occurred? Does anybody know what this means?


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IAM can drop due to either FBKC knock correction or FLKC you need to look for both, the oft monitoring of flkc is a bit suspect at present, so you may need to look at you kc learned values and compare them to the values in the knock correction max A table to see where the knock is. If the IAM is dropping you have a level of knock somewhere that the ecu is compensating for. IAM is the ecu,s last line of defence on knock

see the Knock fix for Australian fuels thread


see this bit of your log

http://www.datazap.me/u/kronos/color...om=22984-23354

notice the chunk out of your kc learned where the IAM drops