Quote:
Originally Posted by JimGnitecki
This is an interesting thread. Our local gasoline stations offer only 87, 89, and 91 octane fuel. Every pump offers your choice of all 3 octane levels. There is a label on the pump that states that there "may be' up to 10% ethanol in the fuel.
So, what does all the above actually tell me about the gasoline I am buying?
For example, is the undergorund tank 100% gasoline, and is the octane rating solely dependent upon how much ethanol is mixed into that gasoline by the pump selection I make?
Is 87 octane fuel 100% gasoline?
Is the 10% ethanol level achieved only when I select 91 octane?
Does my LT1 with its Magnuson 2650 "know" how much ethanol is in the 91 octane fuel I am filling with?
Or does the ECU merely monitor for knock and back off timing until there is no knock?
Is there an online guide somewhere on how to blend ethanol into 91 octane gasoline to achieve a certain percent ethanol mix?
I'm asking these questions because fuel mixing is all new to me. I know nothing about it.
Jim G
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In all honesty I'd call your tuner and ask all those questions. They know your setup and what it looked like fuel system wise when they logged it/tuned it. If you are on the edge of your stock fuel system, you will be lucky to be able to run e30.
But the general answer to your question about the gas, most modern 87/89/91/93 is all e10. Meaning no matter the octane, it still has 10% ethanol added. So you are always going to be starting at e10. Then if you use that calculator app I posted the screen shot, you could theoretically calculate a blend from there. The only other thing you'd need to know is if the e85 coming out of your local pump is really 85% E. You'd need an E85 tester to check that. Test the E and see where it is. My local station is almost always e80. Then You can calculate how much of the "e85" you need to add to whatever you have in your tank or what you want to fill your tank to in order to get to e30/e40/e50 and so on.
As for the car "knowing". Its not going to know anything unless you get that flex fuel sensor installed. Then once you have that the car can actually see the e blend and raise or lower timing accordingly. Keep in mind that functionality needs to be enabled by your tuner and they would have to tune your car again for e30/40/50 or whatever your fuel system can safely support.
Like I said, call your tuner. They are the best person to guide you into using an e blend. With our cars LT1/4 cars, its dangerous to use too much E until you get the fuel system to support it. These are not like Hellcats or Mustangs where you can change the injectors and you are good to run full e.