ok.. ive been doing some thinking. I really wish there was a way to test octane so i could know for sure whats what. Has anyone run a 40% mix tuned yet? or is it a certain thing that 30% is limit.
So far everything i do could be wrong if the octane rating of different percents of ethanol is off. Most calculations ive seen say anything at 50% and up to 85% are 105 octane. Which means using 65% ethanol would yield a higher octane rating with a lower overall % concentration of ethanol than using 85%. Which would allow us to have a higher octane and still have enough fuel pressure vs using 85% to achieve the same octane.
Now after that, i've found that 98% is found to have 113 octane. Which would allow for a higher octane rating and still a lower concentration of ethanol which would allow for higher octane and more fuel pressure.
Here are some of the mixes i've calculated.
E85 (Gals) 9.00 @ 65%, 105 octane.
Gas (Gals) 10.00 @ 0%, 91 octane.
96.7 octane
30.8% ethanol (or E31)
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E85 (Gals) 9.00 @ 85% 105 octane.
Gas (Gals) 10.00 @ 0% 91 octane.
96.7 octane
40.3% ethanol (or E40)
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E85 (Gals) 8.00 @ 85%, 105 octane.
Gas (Gals) 11.00 @ 0%, 91 octane.
96.1 octane
35.8% ethanol
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E98 (Gals) 7.00 @ 98%, 113 octane.
Gas (Gals) 12.00 @ 0%, 91 octane.
99.1 octane
36.1% ethanol
