Even if it does, the difference between 89 and 94 isn't going to be noticable to the average street rider. Besides, how many of us are riding around at 12,500+ rpm all the time? It might be an advantage at the track, but on the street you're just throwing money away IMO.

 

Race gas is NOT simply higher octane. True race gas will produce great results, and costs way more than pump gas! VP MR9, for instance, makes about 8% more power than pump gas but is only 87 octane (and is around $30 a gallon).

 

Yes - when you tune engines for different octanes you can indeed get more power out of them, and if your bike was tuned to 93 and you were only using 87 then you potentially did have a loss of power. I wouldn't put much stock in a 4 horse power delta because in the half hour it took you to change fuel, flush the fuel, etc.... the temperatures/barometric pressures or any other variables could have changed. NOONE is denying that if you run 87 in an engine set up for 93 that you are going to have less power potential. The point is if the engine is tuned to 87 you AREN'T going to make any more power on 93.

We did google it and I showed in my other post that all other variables remaing static a bike tuned for 87 will NOT make more power on 93. Race fuel is a different blend - it isn't just a higher octane, hence the reason it smells different.

So AGAIN - your bike is tuned for 93. You're argument doesn't hold water. Any vehicle tuned to run on 93 will not reach it's potential on 87, but a vehicle tuned for 87 will not make more horsepower on 93.

 

higher grade gas can produce more hp if tuned for it, but higher grade gas does not produce more hp by itself

the grade of gas is just the resistance to detonation, its no indication of energy in the gas, just a measurement, like temperature

 

higher grade gas ill only produce more power with the correct tune, youd either have to advance your timing or turn up boost pressure if you had a turbo or sc. the reason this works is because higher grade cause actually needs more to ignite. so unless you had more air and fuel in your combustion chamber adding a higher grade gas would do absolutely nothing for your horsepower.

 

ok well my bike manual says to run premium fuel. is 87 premium? i dont think so

 

If it says to run premium than you should run premium. If it says to run 87 and you run 93 you will not make more power in doing that alone - end of story.

 

i totally agree with you