100 Octane fuel - BMW Luxury Touring Community
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post #1 of 26 Old Jun 29th, 2015, 10:04 am Thread Starter
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100 Octane fuel

Has anyone else found massive amounts of extra power with 100 octane? I know as a mechanic that it makes no sense to get more power at a lower burn rate and that it's generally a waste of money. I have a 2003 LT and found that Octane boosters helped also. Any other riders input will be appreciated.

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post #2 of 26 Old Jun 29th, 2015, 6:00 pm
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Re: 100 Octane fuel

I have found that gas with no ethanol gives more mileage and power.


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post #3 of 26 Old Jun 29th, 2015, 6:22 pm
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Re: 100 Octane fuel

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I have found that gas with no ethanol gives more mileage and power.
+1


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post #4 of 26 Old Jun 29th, 2015, 7:33 pm
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Re: 100 Octane fuel

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Originally Posted by sperra View Post
I have found that gas with no ethanol gives more mileage and power.
+1

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post #5 of 26 Old Jun 29th, 2015, 8:01 pm
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Re: 100 Octane fuel

100 Octane has less energy per lb than 93 octane. It just will not detonate in high compression engines.

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post #6 of 26 Old Jun 29th, 2015, 11:40 pm
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Re: 100 Octane fuel

Regarding ethanol-free gas locations, there's a website devoted to US & Canadian locations where you can find listed in the US (for example) state by state, the towns, complete with addresses & phone numbers, as well as the last known octane # and when last updated.

Check out : pure-gas.org

I now carry the list for each area I'm likely to ride thru. Very handy for planning your gas stops.

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post #7 of 26 Old Jun 30th, 2015, 8:58 am
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Re: 100 Octane fuel

Quote:
Originally Posted by 2003BMWK1200LT View Post
Has anyone else found massive amounts of extra power with 100 octane? I know as a mechanic that it makes no sense to get more power at a lower burn rate and that it's generally a waste of money. I have a 2003 LT and found that Octane boosters helped also. Any other riders input will be appreciated.
Never found more than 94 octane and saw no difference. Only 100 octane around here is at the airport and the lead would soon poison the catcon.

Only difference I see is hesitation off-idle and 2 mpg loss with E10 poisoned gas.

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post #8 of 26 Old Jun 30th, 2015, 4:37 pm Thread Starter
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Thanks for the replys. There is a non ethanol pump in Okeechobee FL. I believe that is actually the last place I fueled up with 90 octane non ethanol and felt the power difference the most. Thanks again.
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post #9 of 26 Old Jun 30th, 2015, 11:34 pm
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Re: 100 Octane fuel

Pure gas also has an app that I use all the time while traveling. Great little tool that you can scroll the map to where you are headed.

I have used some (4 gallons)left over racing "no lead" gas that tested at 115 octane. This is designed for the high compression engines. I disconnected the battery overnight and did the relearn in the morning. There was a noticeable difference in torque based on the fact that in 4th gear at 4500 rpm I could actually get the clutch to slip when I opened it up fast. In second gear and accelerating pretty hard coming out of a corner and the old metzler would start to drift. That was a little hairy. I did notice how nice and light gray the exhaust pipe was after using it. At $6.50 a gallon I wouldn't recommend using it, but it sure was fun.

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post #10 of 26 Old Jul 2nd, 2015, 5:29 pm Thread Starter
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I noticed a big difference in the 116 I used once. Why do you have to disconnect the battery overnight? And is leaded 116 harmful to the LT?
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post #11 of 26 Old Jul 2nd, 2015, 6:33 pm
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Re: 100 Octane fuel

You guys use the pure gas quite often I put in my.lawn mower never thought to put in my bike more expensive but what hack were use to it whit the bimmer

Gary
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post #12 of 26 Old Jul 2nd, 2015, 6:52 pm
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Re: 100 Octane fuel

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Originally Posted by 2003BMWK1200LT View Post
I noticed a big difference in the 116 I used once. Why do you have to disconnect the battery overnight? And is leaded 116 harmful to the LT?
Leaded Gasoline will damage your Catalytic Converter in a hurry.
Especially AVGAS.....Don't use it.

The only place that I know of to get leaded Gas is at the airport, and even though it's called "low lead", it has a much higher concentration of lead than the automotive Gas that we used to have.

Just say No.

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post #13 of 26 Old Jul 2nd, 2015, 7:33 pm
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Re: 100 Octane fuel

Quote:
Pure gas also has an app that I use all the time while traveling. Great little tool that you can scroll the map to where you are headed.
I have the app and I find it more useful when I'm riding around my 3 state area, not so much when you are on a long trip.....always seems that the stations are across town and just not worth the time nor trouble to drive in town.
I'm on the way back home from a 4 week journey around the southwest, been a while since I've out there but geeesh what's with all the 90-91 octane, my MPG has absolutely plummeted, I'm pulling a trailer but I'm around 34-35. Around home with no-E and 93 Oct. I'm around 47
Spending the night in Weatherford, OK and right off I-40 there is a Conoco(on Main St) with no-ethanol....91 Oct


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post #14 of 26 Old Jul 2nd, 2015, 10:52 pm
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Re: 100 Octane fuel

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I noticed a big difference in the 116 I used once. Why do you have to disconnect the battery overnight? And is leaded 116 harmful to the LT?
I disconnected the battery to put the motronic in relearn mode. Normally it takes some time for for it to compensate for a major change in fuel quality like this. I wanted it to start fresh on the racing gas so that I could get maximum power available sooner. I use a scan tool on my Yukon to "reset the adaptives" before towing our big camper so that it starts its relearn right away. I forgot to do it one time and it really seemed to struggle for about the first 25 or so miles and then it started to come to life as it learned the pulling program. The computers in vehicles do an amazing job of adapting to driving styles and changing conditions.

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post #15 of 26 Old Jul 5th, 2015, 7:02 pm
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Re: 100 Octane fuel

Jzeiler: you're right in as much as 100 Oct gas has a lower energy content per pound but because it's more resistant to detonation you can run the engine with a higher compression ratio thus getting more torque/hp out of the engine.
The same goes for higher revolutions again getting more power from the fuel.

One of the main reasons for using a higher octane ratings is the resistance to detonation/pinging which burns off valves, pistons and piston rings.
Another is a more controlled combustion which basically gets more hp per gal of gas.
Water gives you some of the same effect, as it makes for a more controlled combustion, so running in a mist or rainfall actually gets more power from the gas.
For fun, the old Boeing 707 used more water during take-off than fuel to get 2 things: more controlled combustion of the jet fuel and also the added steam power to assist during take-off.
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post #16 of 26 Old Jul 5th, 2015, 7:38 pm
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Re: 100 Octane fuel

My bike does not start well with ethanol free fuel. I tried a few tanks. Consistent hard starting.


told the shop foreman about the hardstarting....1st thing he asked me was I using ethanol free fuel?

Apparantly I was not the only one who reported it!

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post #17 of 26 Old Jul 6th, 2015, 12:39 am
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I use the pure gas as much as possible, set two iron butts last year on pure gas.. i use the web site to plane my route and enter the adresses or gps cords in the zumo as way points. I plan every gas stop on long trips. The ap is good too but kinda hard to use ap while on bike.. i too have experienced beter gas mileage i would say probably 40 mile per tank. No hard start problems you might try 2 sync the throttel.
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post #18 of 26 Old Jul 6th, 2015, 6:41 am
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Re: 100 Octane fuel

Quote:
Originally Posted by Atomicman View Post
My bike does not start well with ethanol free fuel. I tried a few tanks. Consistent hard starting.


told the shop foreman about the hardstarting....1st thing he asked me was I using ethanol free fuel?

Apparantly I was not the only one who reported it!
This is the first time I have heard of any difference in starting due to ethanol, particularly better starting using ethanol poisoned fuel. Do you work for ADM?


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post #19 of 26 Old Jul 6th, 2015, 9:51 am
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Re: 100 Octane fuel

There is no technical basis for starting problems specifically with non-ethanol fuels. Sounds fishy. Quite the contrary.
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post #20 of 26 Old Jul 6th, 2015, 3:39 pm
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Re: 100 Octane fuel

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There is no technical basis for starting problems specifically with non-ethanol fuels. Sounds fishy. Quite the contrary.
Mn MechEngr
That was my thought also, but I am always open to a convincing argument supported by data.

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post #21 of 26 Old Jul 6th, 2015, 5:12 pm
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Re: 100 Octane fuel

Just ride everyday like I do & the Ethanol in the fuel wont be any problem.

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post #22 of 26 Old Jul 6th, 2015, 5:16 pm
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Re: 100 Octane fuel

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Just ride everyday like I do & the Ethanol in the fuel wont be any problem.
I ride nearly every day, but that doesn't seem to remove the ethanol from my fuel.

I suffer the mileage loss and hesitation while starting out even when riding 400+ miles each day on tour.

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post #23 of 26 Old Jul 6th, 2015, 5:47 pm
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Re: 100 Octane fuel

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This is the first time I have heard of any difference in starting due to ethanol, particularly better starting using ethanol poisoned fuel. Do you work for ADM?

I an just telling you what happened.

Of course I don't work for ADM!

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post #24 of 26 Old Jul 6th, 2015, 6:27 pm
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Re: 100 Octane fuel

If you don't like Ethanol in your fuel you can always remove it. I use a glass water cooler reservoir I picked up, holds about 5 gal. I use a glass container so I can see the separation and I don't pour the water/alcohol mix off the bottom.

Add a cup or more of water to around 5 gallons of fuel. Shake well and let stand for several hours at least. Since alcohol absorbs water it will separate out and sink to the bottom with the excess water. pour off the gas and let the rest evaporate in a pan.

Congrats, you just de-ethanoled your fuel for your lawn mower or boat or bike or whatever.
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post #25 of 26 Old Jul 6th, 2015, 8:30 pm
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Re: 100 Octane fuel

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If you don't like Ethanol in your fuel you can always remove it. I use a glass water cooler reservoir I picked up, holds about 5 gal. I use a glass container so I can see the separation and I don't pour the water/alcohol mix off the bottom.

Add a cup or more of water to around 5 gallons of fuel. Shake well and let stand for several hours at least. Since alcohol absorbs water it will separate out and sink to the bottom with the excess water. pour off the gas and let the rest evaporate in a pan.

Congrats, you just de-ethanoled your fuel for your lawn mower or boat or bike or whatever.
Except for the LT, it is easier to visit the airport.

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post #26 of 26 Old Jul 6th, 2015, 11:23 pm
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Re: 100 Octane fuel

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Originally Posted by Centaurious View Post
If you don't like Ethanol in your fuel you can always remove it. I use a glass water cooler reservoir I picked up, holds about 5 gal. I use a glass container so I can see the separation and I don't pour the water/alcohol mix off the bottom.

Add a cup or more of water to around 5 gallons of fuel. Shake well and let stand for several hours at least. Since alcohol absorbs water it will separate out and sink to the bottom with the excess water. pour off the gas and let the rest evaporate in a pan.

Congrats, you just de-ethanoled your fuel for your lawn mower or boat or bike or whatever.
I'm surprised a cup of water is enough to absorb the 1/2 gal of ethanol present in 5 gallons of E10. What is the apparent octane of the resulting fuel? Does it ping in your bike? boat? or lawnmower?

I'd just dump the water alcohol mix down the drain. It isn't going to hurt anything.
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