Quote:
Originally posted by sandmanblue
With only 13:1, you might be just fine with a 50/50 mix of something like VP110 and 92 Pump gas. BUT.... What are you really saving in not running straight 110? If the 110 is $7/gal and 92 is $3.00/gal, it will cost you about $16 and the hassle of mixing fuels each time to fill your tank. In addition, you will probably get the ratios mixed up when you mix them a 2nd and 3rd or more times. If you run straight 110, you'll spend about $22.50 to fill up (3.2 gallons). So you spent $6.5 dollars more, but didn't run around to two different places and have a consistent fuel to boot.
I just can't understand why anyone would spend $500+ to hop up their motor, and then they won't spend another $6 to fill their tank with the right fuel.
The other option is to use some of the lesser expensive race fuels found at pumps like the 100 octane unleadeds from Union 76 and VP. They run about $6/gal.
Whatever you decide, get the jetting dialed on a dyno and don't change fuels all the time (like a lot of ppl do). You need to jet for a specific fuel. Changes in different fuels can affect jetting as much as 2 - 3 jet sizes - so you're gambling if you switch.
I have mine specifically jetted for two race fuels - VP C12 and Sunoco MO2X Oxy fuel. They both use the same jetting, verified on a dyno. The oxy makes another 0.5 hp - FWIW. Oh - and the tank gets drained after a riding weekend and the fuels get put back into sealed metal cans to preserve them.