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Discussion in 'GS Boxers' started by 8241, Oct 30, 2017.
Just read through the Manuel and now bmw recommends 87 octane fuel. Wonder what changed ?
What changed? Honda AT arrived and it burns regular gas.
What are the implications? I use 93. Is there any harm done? Wasting money? Because I'm ok with that if I get more performance
Using higher octane than required will not improve performance.
^^You bring up some interesting points. I've burned 'mid range' 89 octane with no ill effects. I also believe you can have your ECU re-flashed to burn regular if planning to ride in the 3rd world (or just economically minded) - I here defer to those with technical knowledge on the subject of re-flash.
It will depend on how sophisticated the control algorithms are in the ecu. If it can tune to take full advantage of the octane then you will get more performance. If they play it safe and it does not retune, you can have worse power, as higher octane has lower BTU per gallon, so more must be burned.
I am sure at some point we will have someone dyno on both fuel types, then we can know. Until then it is all guesses and wishes
For model years up until 2018 BMW has recommended Premium fuel but with the footnote "89 AKI" which is Mid Grade in most states.
Generally speaking internal combustion gasoline engines run at their peak efficiency when they are right on the verge of detonation so for this reason using fuel of higher octane than required is usually a waste of money since higher octane fuels contain less specific energy as noted above.
There was a time when premium fuel grades would often contain more detergent and additives but that is no longer the case.
I wonder what the technical reasoning for BMW to change the fuel requirement for the 2018 models, if it was an actual change to the bike (likely software if any) or if they have just come to the conclusion over the years that 87 octane fuel is safe.
I just compared 2014, 2017, 2018 and there hasn't been any change. Are referring to the 'alternative' fuel option?
Occasionally the printed manual that comes with the bike is more up to date and not exactly the same as the .pdf version downloaded from BMW's site, there is a chance that the OP is correct.
So ... to add to the issue ... how much 87 are we getting from a pump with only one hose?
I highly suspect that 95% of cage drivers get the 87 and with the gate valve being at the other end of the hose from the nozzle ....
I figure I am getting about a gallon of 87 with every purchase of 91 or higher octane.
A gallon? You think it's that much?
Guessing ... not sure of the hose ID.
I read an article that seemed to be written with some facts and common sense, it may not have any place on this forum but the author seemed knowledgable and estimated no more than 1/3 of a gallon was left in the system between each use and would not effect the octane numbers as long as a couple gallons or more were dispensed.
I notice that many stations have pumps that use separate nozzle/hoses for each grade these days.
I am glad to know this. I guess I can stop running the bike on fumes until I find a three hose pump.
I digress but I found this during some research of the topic.
(publisher has not validated the validity of this photo)
I get all my premium at the 'high test' pump. Well, that's where it came from on May 8th in Maupin, OR.
I'll wager it wasn't no millennial that pumped your gas with that contraption, no one this side of 70 years of age would be able to operate that pump, you gotta love it.
It easy ... ya twist that black thingy until you see the number of woman that lust for me, then you go inside and screw the fuse in at the fuse box marked non-local-folk, RUN outside before all those rusted joint start spewing fuel every where and pump the gas as you would anywhere else.
Had the BMW dealer flash the 87 map. Been running 87 since new. No porblem no issue. 16kmiles now. Pulled plugs to change last week and they look perfect.