Unless your engine build has enough compression/cam to cause pre detonation a higher octane rating isn't necessary and won't increase performance anywhere but in your head. High octane fuel is more stable and less likely to cause pinging in high compression, high performance engines, but adding it to a stock or near stock engine does not increase power or performance.

Sorry

 

http://www.vpracingfuels.com/
Im sure its not street legal, you can buy it but you have to put it in a street machine yourself they wont pump it in. There have been VP dealers in Dallas for yrs, used to be able to pull up to a pump and pump it in but that's been a few yrs. C10 is one grade that has no ethanol.

 

We have Sunoco here. No ethanol-100 and 110 purple(leaded) My bobber is over 12:1 comp. or VP-c12 if i can find it. Up in Daytona their are a few stores that sell reg pump gas with no ethanol.

 

Remember I wasn't running it undiluted and the mix was no where near 105, the increased power and ability to hold to a higher sustained rpm are not "in my head" no matter what you say, that's simple BS but I understand you believing that even some high octane distributors and "experts" fall into that belief. You can easily get to the point where you are past the point of improvement tho. And no I'm not an "expert" and have no documented verification, I have been riding 45 yrs and can tell when fuel makes a difference, this did, just like gas with no ethanol runs better then ethed up gas, its just the way it is,

Sorry

 

The only way you would benefit from a higher octane is if your Power Commander has a map in it that can use it. Higher octane fuel is more "resistant" to ignition than lower octane, so for ECM's that can adjust, you can advance the timing which increases power. Knocking or pre-ignition is the fuel mixture igniting from heat and compression, not from the spark plug firing. Most stock ECM's have a range that they can function in, but usually the range is to retard the timing (less power) because some HD owners put in 87 octane instead of the recommended 91.

 

I have an advanced PCIII map that I tweaked myself to increase performance, not with high octane in mind but if that is the case than maybe that explains it. I only get 34 mpg (at best, usually 33 with the 105 mix I only got 28), I don't have an explanation I just know it performed. As stated I make no claims as to being a fuel expert I just know when something works. Today I topped off with 2.1 gallons 93 and noticed a drop in go go but it still runs good.
I'm always interested in the high octane discussions to see what others think. I find it odd that every time someone claims an improved riding experience with it a certain crowd always comes up with the "its in your head" answer, gee must be a lot of easily fooled riders out there.

 

I'm always interested in the high octane discussions to see what others think. I find it odd that every time someone claims an improved riding experience with it a certain crowd always comes up with the "its in your head" answer, gee must be a lot of easily fooled riders out there. [/QUOTE]

Yes, there are

 

Octane does NOT give you hp. It is in your head. You need to do a search on the net and read up. Look up burn rate, and what it does for and engine. This will keep you occupied for a few days.

BTW I build engines for a living. I also sponsor a few pro MX, and GNCC riders. The picture is some of my port work.

 

Ill say one more thing than I will let it go. I know octane makes a deference, my bike calls for premium, 93 is about as good as it gets now days in most cases, but it wasn't that long ago that premium was really premium. I know for my engine lots of added octane isn't going to do much after a certain point, but raising it from 93 to around 98 or so (blending the 105 in) actually does increase performance, I don't know at what point it stops being beneficial but obviously that point exists. I think if I ran a tank of 105 undiluted the cost would far exceed the benefit. Never in my initial post did I say I was running extremely high octane, just a few real points higher than whats commonly available, and at that rate it provides a distinct improvement on my bike.
There are other fuel additives that will help performance as well. Most that I have tried didn't live up to their claims however. I have found two octane boost that work to some degree, but not really worth the effort or money. I have found one product I like that actually works although its not really an octane boost, RXP (http://www.rxp.com/)which makes all your fuel burn and I can actually tell the difference, although I don't use it if I find gas without ethanol. The performance boost to my choice for my bike is 93 no ethanol but you have to get out of town a ways here to find any.
That was kind of a long 'one more thing'

 

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