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Old 10-27-2008, 05:39 AM   #16
FastEddieB
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FWIW, I installed a push/pull switch I had laying around, routing the wires to the "glovebox":



On my 2005 950, I've been running regular for well over a year, with the wires "disconnected" and no issues at all.

Of course, I'm carbureted. I don't notice and real change in power, performance, idle or smoothness. I'm just doing it to save money on gas, and in the twisties and offroad the power is still more than andequate.

But That's Just Me™!
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Old 01-14-2009, 10:44 AM   #17
erappaport
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Question Octane Ratings?

Anybody know if the octane rating system referred to in the KTM manual is the same as we use in the US, or is it a european standard? The book recommends disconnecting the wires when using fuel below 95 "ROZ". I don't recall seeing that acronym in the states, nor have I seen pump fuel above 93, except at an airport.
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Old 01-14-2009, 11:01 AM   #18
jsrider
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Quote:
Originally Posted by erappaport
Anybody know if the octane rating system referred to in the KTM manual is the same as we use in the US, or is it a european standard? The book recommends disconnecting the wires when using fuel below 95 "ROZ". I don't recall seeing that acronym in the states, nor have I seen pump fuel above 93, except at an airport.
It's European. Their 95 is approximately equivalent to our 91.
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Old 01-14-2009, 08:18 PM   #19
dezracer
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Quote:
Originally Posted by stephenws
After putting 2100 miles on my new 2007 990 Adventure (all of them with 91-93 octane), I decided to put some 89 octane fuel in the tank and try the low octane ignition curve. After disconnecting the wires under the seat, I started up the bike. Right away, I noticed the idle rpm dropped from it's normal steady 1500rpm to a variable 1200 to 1300rpm. After about five minutes of idling, the FI light came on and indicated a 18 blink code (lambda probe for front cylinder). I then shut down the engine and reconnected the ignition curve wires. Upon restarting, everything was back to normal.

Has anyone else experienced this? One of the reasons I bought the bike was because of it's ability to adapt to various octane levels. In rural Iowa, most gas stations don't offer premium 91 to 93 octane gas - 89 octane with 10% ethanol is everywhere though

Any thoughts on what might be happening? I'd really like to be able to use the 89 octane fuel.

Thank you.
Its normal. MOST 990s throw the code when the wires are disconnected.
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Old 01-19-2009, 04:19 PM   #20
turkish
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My bike is a '03 950 and I never needed to use the low octane mode in the states. However, there's some really punky fuel down here in south america. My bike detonates/pings with the wires connected with Bolivian fuel which is 85 octane.

I do notice less power and less fuel efficiency, but I'm not sure whether that's due to the "switch", the punky fuel or the altitude.
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Old 01-19-2009, 07:08 PM   #21
Trail Flyer
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I run my '04 950 with the low octane leads disconnected almost all of the time and usually run midgrade gas (in CA, I think it's around 89 octane). I tried running with the leads connected and used premium but never noticed ANY change whatsoever in performance or fuel economy (I always get about 140 miles before the reserve light comes on- which is crappy). I've never heard any pinging. Even with the leads disconnected I have no problem pulling wheelies in 2nd and sometimes 3rd gears, and with all the power I want I see no reason to run the better fuel.
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Old 01-19-2009, 10:00 PM   #22
abruzzi
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Quote:
Originally Posted by erappaport
Anybody know if the octane rating system referred to in the KTM manual is the same as we use in the US, or is it a european standard? The book recommends disconnecting the wires when using fuel below 95 "ROZ". I don't recall seeing that acronym in the states, nor have I seen pump fuel above 93, except at an airport.
Wikipedia has a good explanation of octanes. THere are two different typs of measurements RON and MON (I'm assuming ROZ is the same as RON.) USA uses the average of the two. You've probably noticed that pumps mention (R+M)/2. RON 95 genrally equates to 90 (R+M)/2.

Geof
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Old 04-14-2009, 11:57 PM   #23
tahoeacr
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While on the dyno today I decided to unplug and see what we got. Loss of a couple HP below about 6k but peak HP was not that far off. The VERY SCARRY part was it leaned out the A/F readings. Way out.
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Old 04-15-2009, 10:13 AM   #24
Vicks
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Quote:
Originally Posted by tahoeacr
While on the dyno today I decided to unplug and see what we got. Loss of a couple HP below about 6k but peak HP was not that far off. The VERY SCARRY part was it leaned out the A/F readings. Way out.
does that mean that with the low octane plug disconnected, the engine runs hotter ?
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Old 04-15-2009, 05:11 PM   #25
Bok Befok
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Quote:
Originally Posted by stephenws
After putting 2100 miles on my new 2007 990 Adventure (all of them with 91-93 octane), I decided to put some 89 octane fuel in the tank and try the low octane ignition curve. After disconnecting the wires under the seat, I started up the bike. Right away, I noticed the idle rpm dropped from it's normal steady 1500rpm to a variable 1200 to 1300rpm. After about five minutes of idling, the FI light came on and indicated a 18 blink code (lambda probe for front cylinder). I then shut down the engine and reconnected the ignition curve wires. Upon restarting, everything was back to normal.

Has anyone else experienced this? One of the reasons I bought the bike was because of it's ability to adapt to various octane levels. In rural Iowa, most gas stations don't offer premium 91 to 93 octane gas - 89 octane with 10% ethanol is everywhere though

Any thoughts on what might be happening? I'd really like to be able to use the 89 octane fuel.

Thank you.
hey neighbour, ive been wondering how good the 10% ethanol is in the fuel. would there be any problems if using the fuel with ethanol?
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Old 04-15-2009, 06:21 PM   #26
Helmet Head
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Quote:
Originally Posted by Wacky Joe
hey neighbour, ive been wondering how good the 10% ethanol is in the fuel. would there be any problems if using the fuel with ethanol?
A little off-topic, as 'bad gas' and octane have nothing to do with each other, despite what oil companies would like you to think. That is, it's perfectly possible to have excellent quality low-octane fuel and total crap high-octane fuel. Octane is simply a measure of the temperature at which the fuel spontaneously combusts; it has nothing to do with energy contained in the fuel or how clean the fuel is.

But, since you ask... ethanol is total shit IMO. It's highly hydrophilic, so it attracts water at a much faster rate than pure gasoline. It has much more oxygen than gasoline, so it runs hotter. It also has less energy than gasoline (even though it is higher octane - showing that not only do octane and energy have nothing to do with each other, but they can actually have an inverse relationship in some cases), so you get lower mileage with it. It doesn't burn as cleanly, so it makes many engines run rough. I don't want to turn this into a political argument, but it's been pretty well proven that ethanol is being used purely to support the US corn industry and not because it has any advantage as a fuel. Even in terms of environmental impact, its effect is null on emissions, and a loss in terms of production. Again, it's shit. Since becoming universal here in New England, all of my vehicles have run worse and gotten lower MPG. I know for a fact it was the cause of surging and stalling on my BMW F650GS, and I suspect it is the cause of those symptoms in many EFI bikes.

Ethanol!

Here's what I think of Congress, the EPA, etc. for letting this crap into our fuel supply...
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Old 04-15-2009, 06:32 PM   #27
Bok Befok
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Quote:
Originally Posted by Helmet Head
A little off-topic, as 'bad gas' and octane have nothing to do with each other, despite what oil companies would like you to think. That is, it's perfectly possible to have excellent quality low-octane fuel and total crap high-octane fuel. Octane is simply a measure of the temperature at which the fuel spontaneously combusts; it has nothing to do with energy contained in the fuel or how clean the fuel is.

But, since you ask... ethanol is total shit IMO. It's highly hydrophilic, so it attracts water at a much faster rate than pure gasoline. It has much more oxygen than gasoline, so it runs hotter. It also has less energy than gasoline (even though it is higher octane - showing that not only do octane and energy have nothing to do with each other, but they can actually have an inverse relationship in some cases), so you get lower mileage with it. It doesn't burn as cleanly, so it makes many engines run rough. I don't want to turn this into a political argument, but it's been pretty well proven that ethanol is being used purely to support the US corn industry and not because it has any advantage as a fuel. Even in terms of environmental impact, its effect is null on emissions, and a loss in terms of production. Again, it's shit. Since becoming universal here in New England, all of my vehicles have run worse and gotten lower MPG. I know for a fact it was the cause of surging and stalling on my BMW F650GS, and I suspect it is the cause of those symptoms in many EFI bikes.

Ethanol!

Here's what I think of Congress, the EPA, etc. for letting this crap into our fuel supply...
Thats exactly wut i wanted to know, thanks mate
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Old 05-15-2009, 03:43 PM   #28
PHACTORYPHIL
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So what's the verdict? I' am hearing mixed reviews.. I've run all 3 American octanes from sea level to 10,000 ft without any problems and without activating the low octane ignition curve. I'm thinking about installing a switch just incase I get some really bad fuel or am I just wasting my time?
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Old 05-17-2009, 07:21 PM   #29
tahoeacr
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Quote:
Originally Posted by PHACTORYPHIL
So what's the verdict? I' am hearing mixed reviews.. I've run all 3 American octanes from sea level to 10,000 ft without any problems and without activating the low octane ignition curve. I'm thinking about installing a switch just incase I get some really bad fuel or am I just wasting my time?
Don't think you have to sweat it. Yesterday I got stuck out in the desert away from any real gas stations. The only one had only 87 octane. I put 1.5 gallons in to get me back. My knock sensor didn't show any more knocks than with 91. I did not disconnect the octane switch. This was at about 4,700'.
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Old 09-13-2010, 01:52 PM   #30
lakecntyrider
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Quote:
Originally Posted by dezracer
Its normal. MOST 990s throw the code when the wires are disconnected.
This happened to me on a trip last month after switching to low octane, so searched on the site to see if anyone else encountered this. What does it mean that it's "normal"? Does anyone know why it is raised?
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